Official Paper

RRB JE ECE 22 Apr 2025 Shift 1 CBT 2 Official Paper (Previous Year Paper)

150 questions · 120 minutes · with answers · free

Attempt as Timed Mock Test

General Abilities (50 questions)

1

Which of the following CANNOT be considered as a measure to control global warming?

  1. ((a))

    Efficiently using energy

  2. ((b))

    Cutting down use of fossil fuel

  3. ((c))

    Reduction in emission of greenhouse gases

  4. ((d))

    Causing deforestation

Show Answer
Answer: ((a))

Efficiently using energy

2

What is the maximum number of Ministers allowed in the Council of Ministers, including the Prime Minister, as per the 91st Amendment Act?

  1. ((a))

    12% of Lok Sabha strength

  2. ((b))

    10% of Lok Sabha strength

  3. ((c))

    15% of Lok Sabha strength

  4. ((d))

    20% of Lok Sabha strength

Show Answer
Answer: ((a))

12% of Lok Sabha strength

3

What is the net force acting on an object if balanced forces are applied?

  1. ((a))

    Equal to the mass of the object

  2. ((b))

    Zero

  3. ((c))

    Equal to acceleration

  4. ((d))

    Infinite

Show Answer
Answer: ((a))

Equal to the mass of the object

4

Which of the following is NOT a source of release of smokestacks?

  1. ((a))

    Rivers

  2. ((b))

    Smelters

  3. ((c))

    Thermal power plants

  4. ((d))

    Industries

Show Answer
Answer: ((a))

Rivers

5

What is the primary purpose of using a firewall on a Personal Computer?

  1. ((a))

    To increase storage space

  2. ((b))

    To block unauthorised access and protect the computer

  3. ((c))

    To clean up temporary files

  4. ((d))

    To speed up internet connectivity

Show Answer
Answer: ((a))

To increase storage space

6

The energy that is derived from the use of radioactive isotopes is termed as _________.

  1. ((a))

    thermal energy

  2. ((b))

    solar energy

  3. ((c))

    geothermal energy

  4. ((d))

    nuclear energy

Show Answer
Answer: ((a))

thermal energy

7

The fine powder that is obtained from the modified and recycled form of plastic is called

_______.

  1. ((a))

    polyblend

  2. ((b))

    polystyrene

  3. ((c))

    polyethylene

  4. ((d))

    polythene

Show Answer
Answer: ((a))

polyblend

8

Which of the following is NOT toxic to non-target organisms in the soil?

  1. ((a))

    Organic fertilisers

  2. ((b))

    Pesticides

  3. ((c))

    Herbicides

  4. ((d))

    Fungicides

Show Answer
Answer: ((a))

Organic fertilisers

9

What does PCB stand for?

  1. ((a))

    Processing Circuit Board

  2. ((b))

    Peripheral Connection Bus

  3. ((c))

    Primary Control Board

  4. ((d))

    Printed Circuit Board

Show Answer
Answer: ((a))

Processing Circuit Board

10

Which of the following is NOT a component of a CPU?

  1. ((a))

    Arithmetic Logic Unit (ALU)

  2. ((b))

    Hard Disk

  3. ((c))

    Cache Memory

  4. ((d))

    Control Unit (CU)

Show Answer
Answer: ((a))

Arithmetic Logic Unit (ALU)

11

In which of the following regions the Himalayas has the greatest width?

  1. ((a))

    Sikkim

  2. ((b))

    Kashmir

  3. ((c))

    Himachal Pradesh

  4. ((d))

    Arunachal Pradesh

Show Answer
Answer: ((a))

Sikkim

12

Which official in the Gupta administration was responsible for peace and war matters?

  1. ((a))

    Vishayapati

  2. ((b))

    Sandhi-Vigrahika

  3. ((c))

    Mahapratihara

  4. ((d))

    Mahadandanayaka

Show Answer
Answer: ((a))

Vishayapati

13

Which of the following is a characteristic difference between colloids and true solutions?

  1. ((a))

    True solutions have visible solute particles, whereas colloids have invisible dispersed particles.

  2. ((b))

    True solutions have a single-phase system, whereas colloids have a two phase system.

  3. ((c))

    True solutions exhibit Brownian motion, but colloids do not.

  4. ((d))

    True solutions show the Tyndall effect, but colloids do not.

Show Answer
Answer: ((a))

True solutions have visible solute particles, whereas colloids have invisible dispersed particles.

14

Which of the following cities hosted the inaugural Kho Kho World Cup in January 2025?

  1. ((a))

    Chennai

  2. ((b))

    New Delhi

  3. ((c))

    Mumbai

  4. ((d))

    Kolkata

Show Answer
Answer: ((a))

Chennai

15

The primary agent that helps in the decomposition of biodegradable matter in domestic sewage is __________.

  1. ((a))

    chloride

  2. ((b))

    nitrate

  3. ((c))

    bacterium

  4. ((d))

    phosphate

Show Answer
Answer: ((a))

chloride

16

What is the first step to securing ones smartphone or tablet?

  1. ((a))

    Setting a password/PIN-protected lock screen

  2. ((b))

    Turning off mobile data

  3. ((c))

    Using only free Wi-Fi networks

  4. ((d))

    Installing more apps

Show Answer
Answer: ((a))

Setting a password/PIN-protected lock screen

17

What is the approximate pH of a neutral salt solution?

  1. ((a))

    Less than 7

  2. ((b))

    Depends on the temperature

  3. ((c))

    More than 7

  4. ((d))

    Equal to 7

Show Answer
Answer: ((a))

Less than 7

18

Why does a bee sting cause pain and irritation?

  1. ((a))

    The sting releases carbon dioxide gas.

  2. ((b))

    The sting injects a mild sugar solution.

  3. ((c))

    The sting injects methanoic acid.

  4. ((d))

    The sting contains a strong base.

Show Answer
Answer: ((a))

The sting releases carbon dioxide gas.

19

If you want the primary recipient to see that others have received a copy of an email, you should enter their email addresses in the ______ field.

  1. ((a))

    Bcc

  2. ((b))

    Cc

  3. ((c))

    Subject

  4. ((d))

    To

Show Answer
Answer: ((a))

Bcc

20

What is the purpose of the Collation option in the Print settings?

  1. ((a))

    To print all the pages of a document as a set

  2. ((b))

    To select a custom print range

  3. ((c))

    To adjust the page orientation

  4. ((d))

    To change the printer selection

Show Answer
Answer: ((a))

To print all the pages of a document as a set

21

The Rudra Veena is predominantly associated with which genre of Hindustani music?

  1. ((a))

    Thumri

  2. ((b))

    Dhrupad

  3. ((c))

    Khayal

  4. ((d))

    Ghazal

Show Answer
Answer: ((a))

Thumri

22

Which of the following correctly represents the chemical formula of a compound formed by aluminium and sulphate ions?

  1. ((a))

    Al(SO4)3

  2. ((b))

    Al2SO4

  3. ((c))

    Al2(SO4)3

  4. ((d))

    Al3(SO4)2

Show Answer
Answer: ((a))

Al(SO4)3

23

Which of the following states is NOT covered under the Atal Bhujal Yojana?

  1. ((a))

    Maharashtra

  2. ((b))

    Rajasthan

  3. ((c))

    Jharkhand

  4. ((d))

    Uttar Pradesh

Show Answer
Answer: ((a))

Maharashtra

24

The phenomenon of multiple echoes due to repeated reflections is called ___________.

  1. ((a))

    resonance

  2. ((b))

    refraction

  3. ((c))

    diffraction

  4. ((d))

    reverberation

Show Answer
Answer: ((a))

resonance

25

If the absolute refractive index of a medium is less than 1, it means ________.

  1. ((a))

    light travels faster in that medium than in vacuum

  2. ((b))

    the medium is a perfect reflector

  3. ((c))

    the medium absorbs all light

  4. ((d))

    light travels slower in that medium than in vacuum

Show Answer
Answer: ((a))

light travels faster in that medium than in vacuum

26

The Millennium Development Goals (MDGs) aimed to reduce extreme poverty by which year?

  1. ((a))

    2008

  2. ((b))

    2015

  3. ((c))

    2005

  4. ((d))

    2014

Show Answer
Answer: ((a))

2008

27

Which defect of vision occurs due to the weakening of ciliary muscles with age?

  1. ((a))

    Astigmatism

  2. ((b))

    Hypermetropia

  3. ((c))

    Myopia

  4. ((d))

    Presbyopia

Show Answer
Answer: ((a))

Astigmatism

28

Which state of matter shows the highest expansion when temperature is increased?

  1. ((a))

    Solids

  2. ((b))

    Gases

  3. ((c))

    Liquids

  4. ((d))

    Plasma

Show Answer
Answer: ((a))

Solids

29

What is the primary function of the F4 key in MS Excel when editing a cell reference in a formula?

  1. ((a))

    Opens the Find and Replace dialog

  2. ((b))

    Toggles between absolute and relative references

  3. ((c))

    Repeats the last action

  4. ((d))

    Refreshes the worksheet

Show Answer
Answer: ((a))

Opens the Find and Replace dialog

30

The main use of chlorofluorocarbons is in __________.

  1. ((a))

    smog

  2. ((b))

    chimneys

  3. ((c))

    refrigerants

  4. ((d))

    vehicles

Show Answer
Answer: ((a))

smog

31

Which of the following is the correct way to insert a new column in a spreadsheet?

  1. ((a))

    Go to Home > Insert > Insert Sheet Columns.

  2. ((b))

    Go to File > New > Column.

  3. ((c))

    Use Ctrl + Z to insert a column.

  4. ((d))

    Press Ctrl + X and then Insert.

Show Answer
Answer: ((a))

Go to Home > Insert > Insert Sheet Columns.

32

What is the shortcut key to start a slideshow from the beginning?

  1. ((a))

    F5

  2. ((b))

    Alt + Tab

  3. ((c))

    Shift + F5

  4. ((d))

    Ctrl + P

Show Answer
Answer: ((a))

F5

33

Which of the following companies announced plans in February 2025 to construct the world's longest undersea cable, aiming to enhance internet connectivity across five continents, with landing points in India?

  1. ((a))

    Amazon

  2. ((b))

    Meta

  3. ((c))

    Microsoft

  4. ((d))

    Google

Show Answer
Answer: ((a))

Amazon

34

What is India's global military ranking in the 2025 Global Firepower (GFP) index?

  1. ((a))

    5th

  2. ((b))

    2nd

  3. ((c))

    4th

  4. ((d))

    3rd

Show Answer
Answer: ((a))

5th

35

What happens when an acid reacts with a metal oxide?

  1. ((a))

    Only salt is formed.

  2. ((b))

    A salt and hydrogen gas are formed.

  3. ((c))

    A salt and water are formed.

  4. ((d))

    Only water is formed.

Show Answer
Answer: ((a))

Only salt is formed.

36

Dr. BR Ambedkar described which part of the Indian Constitution as its ‘novel features', while Granville Austin referred to it as the ‘Conscience of the Constitution’?

  1. ((a))

    Directive Principles of State Policy

  2. ((b))

    Fundamental Rights

  3. ((c))

    Preamble

  4. ((d))

    Fundamental Duties

Show Answer
Answer: ((a))

Directive Principles of State Policy

37

If an object is dropped from rest, what will be its velocity after 15 seconds? (g = 9.8 m/s2)

  1. ((a))

    143 m/s

  2. ((b))

    149 m/s

  3. ((c))

    145 m/s

  4. ((d))

    147 m/s

Show Answer
Answer: ((a))

143 m/s

38

What happens when a computer is put into Sleep mode?

  1. ((a))

    It shuts down completely.

  2. ((b))

    It stores data on the hard drive and powers off.

  3. ((c))

    It restarts automatically after a few minutes.

  4. ((d))

    It keeps the session active in RAM while using minimal power.

Show Answer
Answer: ((a))

It shuts down completely.

39

The glass panel used in greenhouses is known to retain ________.

  1. ((a))

    humidity

  2. ((b))

    heat

  3. ((c))

    pH

  4. ((d))

    rainfall

Show Answer
Answer: ((a))

humidity

40

Inertia depends on which property of an object?

  1. ((a))

    Shape

  2. ((b))

    Acceleration

  3. ((c))

    Velocity

  4. ((d))

    Mass

Show Answer
Answer: ((a))

Shape

41

The practice of Jhum cultivation is prevalent in the __________.

  1. ((a))

    South west

  2. ((b))

    North west

  3. ((c))

    North east

  4. ((d))

    South east

Show Answer
Answer: ((a))

South west

42

Which of the following correctly explains why clothes dry faster on a windy day?

  1. ((a))

    Wind decreases the temperature of the water molecules.

  2. ((b))

    Wind removes the water vapour from the clothes’ surroundings.

  3. ((c))

    Wind increases the humidity around the clothes.

  4. ((d))

    Wind reduces the surface area of the clothes.

Show Answer
Answer: ((a))

Wind decreases the temperature of the water molecules.

43

The maximum sound is generated _________.

  1. ((a))

    from vehicular emissions

  2. ((b))

    from house chimneys

  3. ((c))

    from industrial smoke

  4. ((d))

    by the take off of a jet plane

Show Answer
Answer: ((a))

from vehicular emissions

44

Identify the correct formula for the compound formed between Mg2+ and PO43− ions.

  1. ((a))

    Mg(PO4)3

  2. ((b))

    Mg3(PO4)2

  3. ((c))

    Mg2(PO4)3

  4. ((d))

    MgPO4

Show Answer
Answer: ((a))

Mg(PO4)3

45

What was the main objective of the Extremists during the Indian National Movement?

  1. ((a))

    To attain complete independence (Swaraj)

  2. ((b))

    To promote British goods in India

  3. ((c))

    To expand the legislative councils

  4. ((d))

    To bring social reforms

Show Answer
Answer: ((a))

To attain complete independence (Swaraj)

46

According to the Tendulkar methodology, what was the estimated percentage of people below the poverty line in rural areas in 2011-12?

  1. ((a))

    27.5%

  2. ((b))

    20%

  3. ((c))

    25.7%

  4. ((d))

    15.5%

Show Answer
Answer: ((a))

27.5%

47

The Industrial Policy Resolution of 1956 categorised industries into how many groups?

  1. ((a))

    Five

  2. ((b))

    Three

  3. ((c))

    Nine

  4. ((d))

    Seven

Show Answer
Answer: ((a))

Five

48

Which Article provides Ministers the right to participate in parliamentary proceedings but without voting rights?

  1. ((a))

    Article 88

  2. ((b))

    Article 78

  3. ((c))

    Article 53

  4. ((d))

    Article 77

Show Answer
Answer: ((a))

Article 88

49

In an electric circuit, what is the correct way to connect an ammeter?

  1. ((a))

    In either series or parallel

  2. ((b))

    In parallel with the component

  3. ((c))

    In series with the component

  4. ((d))

    In parallel with the source

Show Answer
Answer: ((a))

In either series or parallel

50

Who among the following inaugurated the 38th National Games held in Dehradun in January 2025?

  1. ((a))

    Narendra Modi

  2. ((b))

    Pushkar Singh Dhami

  3. ((c))

    Anurag Thakur

  4. ((d))

    Droupadi Murmu

Show Answer
Answer: ((a))

Narendra Modi

Technical Abilities (100 questions)

51

What is the purpose of fscanf() in C?

  1. ((a))

    Writes formatted data to a file

  2. ((b))

    Reads formatted data from a file

  3. ((c))

    Closes a file

  4. ((d))

    Reads a single character from a file

Show Answer
Answer: ((a))

Writes formatted data to a file

52

Which of the following is an example of a Wide Area Network (WAN)?

  1. ((a))

    A home Wi-Fi network

  2. ((b))

    The internet

  3. ((c))

    A Bluetooth connection

  4. ((d))

    A local office network

Show Answer
Answer: ((a))

A home Wi-Fi network

53

Which Boolean expression correctly represents the Difference (D) output of a Full Subtractor?

  1. ((a))

    D = A ⊕ B ⊕ Cout

  2. ((b))

    D = A ⊕ B ⊕ Bin

  3. ((c))

    D = A ⊕ B

  4. ((d))

    D = A AND B

Show Answer
Answer: ((a))

D = A ⊕ B ⊕ Cout

54

The magnetic field outside a toroidal coil:

  1. ((a))

    is zero

  2. ((b))

    is in a circular pattern around the toroid

  3. ((c))

    is uniform and points radially outward

  4. ((d))

    is uniform and points radially inward

Show Answer
Answer: ((a))

is zero

55

The IO/M' signal in the 8085 microprocessor specifies _______.

  1. ((a))

    whether an interrupt has occurred

  2. ((b))

    whether the data is valid

  3. ((c))

    whether the operation is read or write

  4. ((d))

    whether the operation is memory or I/O related

Show Answer
Answer: ((a))

whether an interrupt has occurred

56

Which port of the 8051 microcontroller functions as a bidirectional I/O and simultaneously acts as an address/data bus for external memory access?

  1. ((a))

    Port 1

  2. ((b))

    Port 3

  3. ((c))

    Port 0

  4. ((d))

    Port 4

Show Answer
Answer: ((a))

Port 1

57

Which of the following defines accuracy in measurement?

  1. ((a))

    The variation in measurements due to environmental factors

  2. ((b))

    The closeness of a measured value to the true value

  3. ((c))

    The ability to repeat the same measurement

  4. ((d))

    The smallest change that can be detected by an instrument

Show Answer
Answer: ((a))

The variation in measurements due to environmental factors

58

In a series magnetic circuit, if the reluctance of one path increases, what will happen to the total magnetic flux in the circuit?

  1. ((a))

    The total flux will increase.

  2. ((b))

    The total flux will remain unchanged.

  3. ((c))

    The flux will divide equally between paths.

  4. ((d))

    The total flux will decrease.

Show Answer
Answer: ((a))

The total flux will increase.

59

Which of the following is a major advantage of Unshielded Twisted Pair (UTP) cables compared to Shielded Twisted Pair (STP)?

  1. ((a))

    ​Better performance in industrial environments

  2. ((b))

    Lower cost and easier installation

  3. ((c))

    Complete resistance to EMI

  4. ((d))

    Higher durability

Show Answer
Answer: ((a))

​Better performance in industrial environments

60

A Zener diode has a breakdown voltage of Vz = 7 V at 300 K, with a temperature coefficient of 2.3 mV/°C. What is the new breakdown voltage Vz at 400 K?

  1. ((a))

    7 V

  2. ((b))

    7.23 V

  3. ((c))

    6.77 V

  4. ((d))

    6.977 V

Show Answer
Answer: ((a))

7 V

61

What does the format specifier %10d in printf("%10d", num); do?

  1. ((a))

    Prints the number with leading zeros in a field of 10 columns

  2. ((b))

    Prints the number in a field of 10 columns

  3. ((c))

    Prints only the number without any extra spaces

  4. ((d))

    Prints the number left-aligned in a field of 10 columns

Show Answer
Answer: ((a))

Prints the number with leading zeros in a field of 10 columns

62

What are the input and output impedances of a voltage-series feedback amplifier?

Given:

Input impedance without feedback: Ri = 5 kΩ

Output impedance without feedback: Ro = 10 kΩ

Feedback factor: Aβ = 19

  1. ((a))

    0.25 kΩ, 0.5 kΩ

  2. ((b))

    100 kΩ, 200 kΩ

  3. ((c))

    0.25 kΩ, 200 kΩ

  4. ((d))

    100 kΩ, 0.5 kΩ

Show Answer
Answer: ((a))

0.25 kΩ, 0.5 kΩ

63

How many distinct states are there are in an n-bit ring counter?

  1. ((a))

    n2\frac{n}{2}

  2. ((b))

    n

  3. ((c))

    2n

  4. ((d))

    2n

Show Answer
Answer: ((a))

n2\frac{n}{2}

64

What is the primary purpose of the metallic shield in a co-axial cable?

  1. ((a))

    To increase bandwidth capacity

  2. ((b))

    To provide structural support

  3. ((c))

    To protect against electromagnetic interference (EMI)

  4. ((d))

    To reduce signal attenuation

Show Answer
Answer: ((a))

To increase bandwidth capacity

65

The vertical deflection of the CRT oscilloscope is proportional to the:

  1. ((a))

    frequency of the input signal

  2. ((b))

    horizontal sweep rate

  3. ((c))

    amplitude of the input signal

  4. ((d))

    phosphor intensity

Show Answer
Answer: ((a))

frequency of the input signal

66

What is a recursive function?

  1. ((a))

    A function that calls itself

  2. ((b))

    A function that calls other functions

  3. ((c))

    A function without parameters

  4. ((d))

    A function without a return type

Show Answer
Answer: ((a))

A function that calls itself

67

Which of the following statements w.r.t. FSK demodulation using PLL circuit is/are correct?

S1: If the input signal frequency changes, the PLL adjusts its frequency output to match the input frequency.

S2: The phase-locked loop is used to track the changes in the frequency of the modulated signal.

  1. ((a))

    Only S1

  2. ((b))

    Only S2

  3. ((c))

    Neither S1 nor S2

  4. ((d))

    Both S1 and S2

Show Answer
Answer: ((a))

Only S1

68

Which of the following options is correct regarding the open-loop differential amplifier?

  1. ((a))

    Input is applied at inverting terminal only.

  2. ((b))

    Input is applied at non-inverting terminal only.

  3. ((c))

    Inputs are applied at both the inverting and non-inverting terminals.

  4. ((d))

    Output is always zero irrespective of the input applied at terminals.

Show Answer
Answer: ((a))

Input is applied at inverting terminal only.

69

Which of the following is a characteristic of serial binary adders?

  1. ((a))

    Each full adder waits for the carry from the previous full adder.

  2. ((b))

    The carry propagation delay is minimised.

  3. ((c))

    They perform addition in parallel.

  4. ((d))

    They use a carry lookahead mechanism.

Show Answer
Answer: ((a))

Each full adder waits for the carry from the previous full adder.

70

How do you declare a pointer to an integer?

  1. ((a))

    int *ptr;

  2. ((b))

    pointer int ptr;

  3. ((c))

    int ptr*;

  4. ((d))

    int ptr;

Show Answer
Answer: ((a))

int *ptr;

71

Which of the following statements about a Hartley oscillator is correct?

  1. ((a))

    An RL network is used in the design of Hartley oscillators.

  2. ((b))

    The Hartley oscillator is commonly used to generate signals below 50 Hz

  3. ((c))

    An RC network is used in the design of Hartley oscillators.

  4. ((d))

    It operates on the principle of parallel resonance.

Show Answer
Answer: ((a))

An RL network is used in the design of Hartley oscillators.

72

A memory chip has a capacity of 4 kB. How many address lines are required?

  1. ((a))

    10

  2. ((b))

    12

  3. ((c))

    16

  4. ((d))

    14

Show Answer
Answer: ((a))

10

73

The high-frequency gain of a common-emitter amplifier is mainly affected by:

  1. ((a))

    collector-base junction capacitance and bypass capacitor

  2. ((b))

    collector-base junction capacitance and emitter-base capacitance

  3. ((c))

    coupling capacitor and collector-base junction capacitance

  4. ((d))

    coupling capacitor and bypass capacitor

Show Answer
Answer: ((a))

collector-base junction capacitance and bypass capacitor

74

What material is primarily used as the core in fiber optic cables?

  1. ((a))

    Copper

  2. ((b))

    Plastic

  3. ((c))

    Aluminium

  4. ((d))

    Glass

Show Answer
Answer: ((a))

Copper

75

What happens to the carry-out bit when subtracting two n-bit numbers using 2's complement and the result is positive?

  1. ((a))

    The carry-out bit indicates an overflow

  2. ((b))

    The carry-out bit is added to the result

  3. ((c))

    The carry-out bit is inverted

  4. ((d))

    The carry-out bit is ignored

Show Answer
Answer: ((a))

The carry-out bit indicates an overflow

76

What is the primary effect of the annealing process on conducting materials such as copper and aluminium?

  1. ((a))

    It increases tensile strength and hardness.

  2. ((b))

    It causes oxidation of the material's surface.

  3. ((c))

    It reduces electrical resistance by decreasing the number of dislocations.

  4. ((d))

    It increases the material's brittleness.

Show Answer
Answer: ((a))

It increases tensile strength and hardness.

77

Which of the following is the correct definition of the capacity of a battery?

  1. ((a))

    The maximum current a battery can provide

  2. ((b))

    The maximum voltage a battery can generate

  3. ((c))

    The total energy a battery can deliver over a period of time

  4. ((d))

    The amount of charge a battery can store and deliver over a specific time period

Show Answer
Answer: ((a))

The maximum current a battery can provide

78

According to Carson’s Rule, what is the approximate bandwidth required for a VHF/UHF two-way radio signal using FM with a 5 kHz maximum frequency deviation and a maximum audio frequency of 3 kHz?

  1. ((a))

    30 kHz

  2. ((b))

    20 kHz

  3. ((c))

    10 kHz

  4. ((d))

    16 kHz

Show Answer
Answer: ((a))

30 kHz

79

The magnetic field inside a solenoid is:

  1. ((a))

    circular and varying with distance

  2. ((b))

    zero

  3. ((c))

    uniform and parallel

  4. ((d))

    non-uniform and divergent

Show Answer
Answer: ((a))

circular and varying with distance

80

Which of the following statements is FALSE for a common-base (CB) amplifier using a BJT?

  1. ((a))

    It has lower input impedance and higher output impedance.

  2. ((b))

    The output characteristics is a plot of output current (IC) vs. output voltage (VCB).

  3. ((c))

    The output impedance is lower than that of a common-emitter amplifier.

  4. ((d))

    The input characteristics is a plot of input current (IE) vs. input voltage (VEB).

Show Answer
Answer: ((a))

It has lower input impedance and higher output impedance.

81

Which Boolean expression correctly represents the Difference (D) output of a Full Subtractor?

  1. ((a))

    D = A ⊕ B

  2. ((b))

    D = A AND B

  3. ((c))

    D = A ⊕ B ⊕ Cout

  4. ((d))

    D = A ⊕ B ⊕ Bin

Show Answer
Answer: ((a))

D = A ⊕ B

82

What is the primary function of the cathode ray tube (CRT) in an oscilloscope?

  1. ((a))

    To display waveforms of the electrical signals

  2. ((b))

    To amplify the electrical signals

  3. ((c))

    To measure the frequency of the signals

  4. ((d))

    To convert the electrical signals into sound

Show Answer
Answer: ((a))

To display waveforms of the electrical signals

83

A special diode with 0 Ω forward resistance and 1 kΩ reverse resistance is connected in series with a 1 kΩ load resistor. A square wave input is applied with:

Maximum voltage (Vmax) = 4 V

Minimum voltage (Vmin) = −4 V

What is the output voltage across the load when the diode is in reverse bias?

  1. ((a))

    -2 V

  2. ((b))

    -4V

  3. ((c))

    +2 V

  4. ((d))

    0 V

Show Answer
Answer: ((a))

-2 V

84

The bandwidth of a raised cosine filter with roll-off factor β (0 to 1) and symbol rate RS is given by:

  1. ((a))

    BW=Rs(2β+1)BW = R_s(2\beta + 1)

  2. ((b))

    BW=Rs(β+1)BW = R_s(\beta + 1)

  3. ((c))

    BW=Rs2(β2+1)BW = \frac{R_s}{2}(\beta^2 + 1)

  4. ((d))

    BW=Rs2(β+1)BW = \frac{R_s}{2}(\beta + 1)

Show Answer
Answer: ((a))

BW=Rs(2β+1)BW = R_s(2\beta + 1)

85

Which of the following is NOT a type of loop in C?

  1. ((a))

    do-while loop

  2. ((b))

    foreach loop

  3. ((c))

    while loop

  4. ((d))

    for loop

Show Answer
Answer: ((a))

do-while loop

86

In common collector configuration of BJT, which of the following options is correct?

  1. ((a))

    It has very high input impedance due to the presence of emitter resistance.

  2. ((b))

    It has a lower input impedance than a common-emitter amplifier.

  3. ((c))

    The input characteristics are a plot of input current (IB) vs. input voltage (VBE) for a constant IE.

  4. ((d))

    If the emitter resistance is bypassed with a capacitor, the input impedance increases.

Show Answer
Answer: ((a))

It has very high input impedance due to the presence of emitter resistance.

87

Which factor is primarily responsible for distortion in a transmitted signal?

  1. ((a))

    External electromagnetic interference

  2. ((b))

    Signal attenuation

  3. ((c))

    Variations in the propagation speed of different frequencies

  4. ((d))

    Excessive bandwidth usage

Show Answer
Answer: ((a))

External electromagnetic interference

88

What type of distortion occurs if a signal that contains frequency components up to 15 kHz is sampled using 20 kHz?

  1. ((a))

    Quantization error

  2. ((b))

    Aliasing

  3. ((c))

    Slope Overload

  4. ((d))

    No distortion

Show Answer
Answer: ((a))

Quantization error

89

A bridge-rectifier is connected to a 24 sin(ωt) V supply. What is the peak inverse voltage (PIV) across the diode?

  1. ((a))

    48/π V

  2. ((b))

    24 V

  3. ((c))

    12 V

  4. ((d))

    24/π V

Show Answer
Answer: ((a))

48/π V

90

Which of the following statements is NOT true about if-else statement in C?

  1. ((a))

    An if-else statement cannot be nested inside another if-else statement.

  2. ((b))

    If a condition is true, it is replaced by 1, if it false, it is replaced by 0.

  3. ((c))

    An if need not always be associated with an else. However, an else must always be associated with an if.

  4. ((d))

    The default scope of if and else statement is only the next statement. So, to execute multiple statements they must be written

    in a pair of braces.

Show Answer
Answer: ((a))

An if-else statement cannot be nested inside another if-else statement.

91

What does 'PROM' stand for?

  1. ((a))

    Processing Read-Only Memory

  2. ((b))

    Peripheral Read-Only Memory

  3. ((c))

    Primary Read-Only Memory

  4. ((d))

    Programmable Read-Only Memory

Show Answer
Answer: ((a))

Processing Read-Only Memory

92

Sinc pulse shaping is derived from the Fourier Transform of a _______ function.

  1. ((a))

    sine

  2. ((b))

    sawtooth

  3. ((c))

    triangular

  4. ((d))

    rectangular

Show Answer
Answer: ((a))

sine

93

Which of the following is the main purpose of SNMP?

  1. ((a))

    Encrypting network data

  2. ((b))

    Monitoring and managing network devices

  3. ((c))

    Providing authentication for web servers

  4. ((d))

    Facilitating file transfers

Show Answer
Answer: ((a))

Encrypting network data

94

Which of the following is the correct octal representation of the hexadecimal number 1A3?

  1. ((a))

    346

  2. ((b))

    124

  3. ((c))

    634

  4. ((d))

    643

Show Answer
Answer: ((a))

346

95

The output voltage of an IC 7905 is _________.

  1. ((a))

    15 V

  2. ((b))

    5 V

  3. ((c))

    −15 V

  4. ((d))

    −5 V

Show Answer
Answer: ((a))

15 V

96

Which of the options is correct for a non-inverting OP-AMP?

  1. ((a))

    Input is applied at the inverting terminal of OP-AMP.

  2. ((b))

    Non-inverting terminal of OP-AMP is grounded.

  3. ((c))

    For an negative input, output is positive.

  4. ((d))

    Output is in phase with input.

Show Answer
Answer: ((a))

Input is applied at the inverting terminal of OP-AMP.

97

Which of the following is NOT correct for a voltage-series feedback amplifier?

  1. ((a))

    Also known as a transconductance amplifier.

  2. ((b))

    Increases input impedance and decreases output impedance.

  3. ((c))

    A non-inverting op-amp is an example of a voltage-series feedback amplifier.

  4. ((d))

    Also known as a voltage-controlled voltage source.

Show Answer
Answer: ((a))

Also known as a transconductance amplifier.

98

Which of the following statements is/are NOT correct regarding an IC 723?

S1: The output voltage ranges from 2 to 37 volts.

S2: The output current is up to 150 mA.

  1. ((a))

    Neither S1 nor S2

  2. ((b))

    Only S2

  3. ((c))

    Only S1

  4. ((d))

    Both S1 and S2

Show Answer
Answer: ((a))

Neither S1 nor S2

99

Which of the following best defines the sensitivity of a protective relay?

  1. ((a))

    The ability of the relay to discriminate between different types of faults.

  2. ((b))

    The capacity of the relay to handle high fault currents without damage.

  3. ((c))

    The ability of the relay to detect and respond to very small fault currents.

  4. ((d))

    The time it takes for the relay to react after detecting a fault.

Show Answer
Answer: ((a))

The ability of the relay to discriminate between different types of faults.

100

Co-axial cables are most commonly used in which of the following applications?

  1. ((a))

    Underwater communication

  2. ((b))

    Satellite communication

  3. ((c))

    Cable television (CATV) systems

  4. ((d))

    Wireless communication networks

Show Answer
Answer: ((a))

Underwater communication

101

What will happen if a break statement is omitted in a switch case?

  1. ((a))

    The compiler will show an error.

  2. ((b))

    The next case will continue to be executed.

  3. ((c))

    The program will stop execution.

  4. ((d))

    The program will exit.

Show Answer
Answer: ((a))

The compiler will show an error.

102

What is the result of applying the complement law A + A' in Boolean algebra?

  1. ((a))

    A

  2. ((b))

    1

  3. ((c))

    0

  4. ((d))

    A'

Show Answer
Answer: ((a))

A

103

One of the main advantages of AAAC (All Aluminium Alloy Conductor) over AAC (All Aluminium Conductor) is:

  1. ((a))

    increased weight for better mechanical strength

  2. ((b))

    higher corrosion resistance

  3. ((c))

    reduced cost of production

  4. ((d))

    lower conductivity

Show Answer
Answer: ((a))

increased weight for better mechanical strength

104

Which of the following statements are true regarding the eye diagram in the communication system?

a) An eye diagram is used to investigate Intersymbol interference.

b) The width of the eye-opening indicates an interval where the wave can be sampled without ISI.

c) Eye diagram is observed in Digital storage oscilloscope.

  1. ((a))

    Only a and c

  2. ((b))

    a, b and c

  3. ((c))

    Only a and b

  4. ((d))

    Only b and c

Show Answer
Answer: ((a))

Only a and c

105

Which of the following gases is commonly used as an insulating material in electrical equipment due to its non-flammable nature and good dielectric strength?

  1. ((a))

    Hydrogen

  2. ((b))

    Nitrogen

  3. ((c))

    Carbon dioxide

  4. ((d))

    Oxygen

Show Answer
Answer: ((a))

Hydrogen

106

How does DDR RAM achieve double the data transfer rate compared to SDRAM?

  1. ((a))

    By increasing the clock frequency

  2. ((b))

    By using a wider data bus

  3. ((c))

    By reducing the refresh rate

  4. ((d))

    By transferring data on both the rising and falling edges of the clock signal

Show Answer
Answer: ((a))

By increasing the clock frequency

107

To increase the word size of a memory system, which of the following techniques is typically used?

  1. ((a))

    Memory interleaving

  2. ((b))

    Memory mapping

  3. ((c))

    Address decoding

  4. ((d))

    Parallel memory modules

Show Answer
Answer: ((a))

Memory interleaving

108

In which of the following electrical applications is a glass insulating material commonly used?

  1. ((a))

    Power cables and conductors

  2. ((b))

    High-voltage switchgear and transformers

  3. ((c))

    Low-voltage electronic circuits

  4. ((d))

    Electrical wires for home appliances

Show Answer
Answer: ((a))

Power cables and conductors

109

What is the purpose of fscanf() in C?

  1. ((a))

    Writes formatted data to a file

  2. ((b))

    Reads formatted data from a file

  3. ((c))

    Closes a file

  4. ((d))

    Reads a single character from a file

Show Answer
Answer: ((a))

Writes formatted data to a file

110

The function of a low pass filter in phase locked loop is ______________.

  1. ((a))

    to remove the high frequency noise present

  2. ((b))

    to demodulate the output signal

  3. ((c))

    to remove the dc component from the signal

  4. ((d))

    to increase the frequency of the input signal

Show Answer
Answer: ((a))

to remove the high frequency noise present

111

In the 8085 microprocessor, ________ instruction is used to identify pending interrupts.

  1. ((a))

    ANI

  2. ((b))

    SIM

  3. ((c))

    RIM

  4. ((d))

    LXI

Show Answer
Answer: ((a))

ANI

112

Which of the following statements is correct regarding the ripple factor of different rectifiers?

  1. ((a))

    A bridge rectifier has a better ripple factor than a centre-tapped rectifier.

  2. ((b))

    A full-wave rectifier has a higher ripple factor than a half-wave rectifier.

  3. ((c))

    A half-wave rectifier has more than twice the ripple factor of a full-wave rectifier.

  4. ((d))

    A rectifier with a higher ripple factor is more preferable for DC power supply than one with a lower ripple factor.

Show Answer
Answer: ((a))

A bridge rectifier has a better ripple factor than a centre-tapped rectifier.

113

Which of the following is a key feature of a microprocessor-based overcurrent relay that enhances its performance in fault detection?

  1. ((a))

    It uses analogue components to process current signals.

  2. ((b))

    It only protects against short-circuit faults.

  3. ((c))

    It incorporates fault analysis algorithms to identify fault types.

  4. ((d))

    It does not require a power supply for operation.

Show Answer
Answer: ((a))

It uses analogue components to process current signals.

114

In Digital Electronics, what does 'EE' in EEPROM stand for?

  1. ((a))

    Extended Execution

  2. ((b))

    External Enable

  3. ((c))

    Electrically Erasable

  4. ((d))

    Enhanced Encryption

Show Answer
Answer: ((a))

Extended Execution

115

How is a multi-dimensional array stored in the memory?

  1. ((a))

    Column-wise (Column-major order)

  2. ((b))

    Randomly

  3. ((c))

    Depends on the compiler

  4. ((d))

    Row-wise (Row-major order)

Show Answer
Answer: ((a))

Column-wise (Column-major order)

116

Which of the following is/are an example of guided transmission media?

  1. ((a))

    Satellite communication

  2. ((b))

    Optical fibre

  3. ((c))

    Radio waves

  4. ((d))

    Infrared signals

Show Answer
Answer: ((a))

Satellite communication

117

_______ is a DMA controller which has four independent channels, CH0 to CH3.

  1. ((a))

    8086

  2. ((b))

    8237

  3. ((c))

    8088

  4. ((d))

    8051

Show Answer
Answer: ((a))

8086

118

Which of the following are Pulse Time Modulation (PTM) techniques?

  1. ((a))

    PAM and PCM

  2. ((b))

    PDM and PCM

  3. ((c))

    PPM and PAM

  4. ((d))

    PWM and PPM

Show Answer
Answer: ((a))

PAM and PCM

119

For an RC phase shift oscillator, which of the following statements is INCORRECT?

  1. ((a))

    The total phase shift of the RC network is 180°.

  2. ((b))

    The magnitude of the gain of the RC network is > 1/29.

  3. ((c))

    The magnitude of gain of the amplifier must be ≥ 29.

  4. ((d))

    The oscillation frequency of the oscillator is 12πRC6\frac{1}{2\pi RC\sqrt{6}}.

Show Answer
Answer: ((a))

The total phase shift of the RC network is 180°.

120

If the open-loop gain of an op-amp is 105 and the input voltage is 100 mV, the value of output voltage is ____________ assuming a supply of ±15 V.

  1. ((a))

    104 V

  2. ((b))

    15 V

  3. ((c))

    0 V

  4. ((d))

    100 V

Show Answer
Answer: ((a))

104 V

121

In a PLL-based FM demodulator, the output of the phase detector is proportional to _______.

  1. ((a))

    the carrier frequency of the FM signal

  2. ((b))

    the amplitude of the FM signal

  3. ((c))

    the frequency deviation of the FM signal

  4. ((d))

    the phase difference between the FM signal and the VCO output

Show Answer
Answer: ((a))

the carrier frequency of the FM signal

122

The Multiplexed address and Data lines in the 8085 microprocessor are _____.

  1. ((a))

    AD7 - AD0

  2. ((b))

    AD8- AD1

  3. ((c))

    AD8- AD15

  4. ((d))

    AD9 - AD16

Show Answer
Answer: ((a))

AD7 - AD0

123

Which of the following characteristics does a piezoelectric transducer exhibit when subjected to mechanical stress?

  1. ((a))

    Change in temperature

  2. ((b))

    Change in frequency

  3. ((c))

    Resistance change

  4. ((d))

    Voltage generation

Show Answer
Answer: ((a))

Change in temperature

124

What is the primary purpose of the graticule in an oscilloscope screen?

  1. ((a))

    To focus the electron beam

  2. ((b))

    To provide a scale for measuring waveform amplitude and time

  3. ((c))

    To convert electrical signals into light

  4. ((d))

    To display the frequency of the signal

Show Answer
Answer: ((a))

To focus the electron beam

125

Which of the following factors primarily affects the insulation resistance of a material?

  1. ((a))

    The temperature of the material

  2. ((b))

    The colour of the insulation

  3. ((c))

    The frequency of the applied voltage

  4. ((d))

    The thickness of the conductor

Show Answer
Answer: ((a))

The temperature of the material

126

Which of the following characteristics is true for ferromagnetic materials?

  1. ((a))

    They retain their magnetisation even after the external magnetic field is removed.

  2. ((b))

    They are weakly repelled by a magnetic field and have negative magnetic susceptibility.

  3. ((c))

    They show no effect in a magnetic field and are considered neutral.

  4. ((d))

    They are strongly attracted to a magnetic field but do not exhibit hysteresis.

Show Answer
Answer: ((a))

They retain their magnetisation even after the external magnetic field is removed.

127

What is the main role of Port 2 in the 8051 microcontroller during external memory access?

  1. ((a))

    It serves as a control signal for serial communication.

  2. ((b))

    It acts as a general-purpose I/O port.

  3. ((c))

    It functions as a data register.

  4. ((d))

    It provides the high-order address byte.

Show Answer
Answer: ((a))

It serves as a control signal for serial communication.

128

According to Laplace's Law of Magnetic Circuits, the magnetic field strength H in a core is directly proportional to the magnetomotive force (MMF) and inversely proportional to the length of the magnetic path. If the MMF is increased by a factor of 2, and the length of the magnetic path is halved, what will be the change in the magnetic field strength H?

  1. ((a))

    It will increase by a factor of 2.

  2. ((b))

    It will remain the same.

  3. ((c))

    It will double.

  4. ((d))

    It will increase by a factor of 4.

Show Answer
Answer: ((a))

It will increase by a factor of 2.

129

If the input I = 1 and the select lines are S1 = 1, and S0 = 0, what will be the values of the four outputs in a 1-to-4 Demultiplexer?

  1. ((a))

    Output 0 = 0, Output 1 = 1, Output 2 = 0, Output 3 = 0

  2. ((b))

    Output 0 = 0, Output 1 = 0, Output 2 = 0, Output 3 = 1

  3. ((c))

    Output 0 = 0, Output 1 = 0, Output 2 = 0, Output 3 = 0

  4. ((d))

    Output 0 = 0, Output 1 = 0, Output 2 = 1, Output 3 = 0

Show Answer
Answer: ((a))

Output 0 = 0, Output 1 = 1, Output 2 = 0, Output 3 = 0

130

The 8051 microcontroller has _____ I/O pins.

  1. ((a))

    24

  2. ((b))

    40

  3. ((c))

    26

  4. ((d))

    32

Show Answer
Answer: ((a))

24

131

A radio receiver is tuned to 560 kHz, and its local oscillator frequency is 1,000 kHz. At the output, another signal is also received along with the desired signal. What is the frequency of the other station?

  1. ((a))

    2,440 kHz

  2. ((b))

    560 kHz

  3. ((c))

    440 kHz

  4. ((d))

    1,440 kHz

Show Answer
Answer: ((a))

2,440 kHz

132

In a Cathode Ray Oscilloscope (CRO), how is a time delay measured?

  1. ((a))

    By varying the intensity of the electron beam

  2. ((b))

    By adjusting the brightness of the display

  3. ((c))

    By using the time base control and measuring the horizontal shift

  4. ((d))

    By changing the vertical deflection voltage

Show Answer
Answer: ((a))

By varying the intensity of the electron beam

133

Which of the following is a primary characteristic of low resistivity materials used in electrical conductors?

  1. ((a))

    High insulation properties and poor conductivity

  2. ((b))

    High thermal resistance and poor conductivity

  3. ((c))

    High cost and low flexibility

  4. ((d))

    High conductivity and low resistivity

Show Answer
Answer: ((a))

High insulation properties and poor conductivity

134

The Time Setting Multiplier (TSM) of a relay is used to:

  1. ((a))

    adjust the operating current threshold of the relay

  2. ((b))

    increase the current setting of the relay

  3. ((c))

    modify the time delay based on fault severity

  4. ((d))

    decrease the time delay of the relay

Show Answer
Answer: ((a))

adjust the operating current threshold of the relay

135

Which of the following factors is directly proportional to the eddy current loss in magnetic materials?

  1. ((a))

    Magnetic field frequency

  2. ((b))

    Thickness of the material

  3. ((c))

    Temperature of the material

  4. ((d))

    Permeability of the material

Show Answer
Answer: ((a))

Magnetic field frequency

136

Which function is used to read a single character from the console in C?

  1. ((a))

    getchar()

  2. ((b))

    scanf()

  3. ((c))

    printf()

  4. ((d))

    puts()

Show Answer
Answer: ((a))

getchar()

137

DSB-SC, VSB and SSB modulation are types of:

  1. ((a))

    Frequency Modulation (FM)

  2. ((b))

    Amplitude Modulation (AM)

  3. ((c))

    Phase Modulation (PM)

  4. ((d))

    Digital Modulation

Show Answer
Answer: ((a))

Frequency Modulation (FM)

138

The function of pin 18 and 19 (XTAL1 and XTAL2) in 8051 Microcontroller is _______.

  1. ((a))

    to control external interrupt

  2. ((b))

    oscillator connection for clock generation

  3. ((c))

    address and data bus decoding

  4. ((d))

    serial data transmission

Show Answer
Answer: ((a))

to control external interrupt

139

Which of the following statements is/are correct?

S1: Filter controls the lock range of the PLL.

S2: Filter controls the capture range of the PLL.

  1. ((a))

    Both S1 and S2

  2. ((b))

    Neither S1 nor S2

  3. ((c))

    Only S1

  4. ((d))

    Only S2

Show Answer
Answer: ((a))

Both S1 and S2

140

In Frequency Modulation (FM), the carrier wave's _____ varies according to the message signal.

  1. ((a))

    phase

  2. ((b))

    wavelenth

  3. ((c))

    amplitude

  4. ((d))

    frequency

Show Answer
Answer: ((a))

phase

141

In the case of a 360° phase shift between two signals, the time delay will be equal to:

  1. ((a))

    half the period of the signal

  2. ((b))

    a quarter of the period of the signal

  3. ((c))

    twice the period of the signal

  4. ((d))

    one period of the signal

Show Answer
Answer: ((a))

half the period of the signal

142

For a diode operating in forward bias, which of the following statements is

INCORRECT?

  1. ((a))

    The reduction in the width of the depletion region is due to the recombination of charge carriers and immobile ions near the junction.

  2. ((b))

    The reduction in the potential barrier occurs due to the narrowing of the depletion region.

  3. ((c))

    The reduction in the depletion region allows a majority carrier flow across the junction.

  4. ((d))

    The reduction in the depletion region causes a heavy flow of minority carriers across the junction.

Show Answer
Answer: ((a))

The reduction in the width of the depletion region is due to the recombination of charge carriers and immobile ions near the junction.

143

In circuit switching, a dedicated communication path is established between the sender and the receiver. This technique is primarily used in which of the following networks?

  1. ((a))

    Cellular networks

  2. ((b))

    Internet

  3. ((c))

    Wireless Local Area Networks (WLANs)

  4. ((d))

    Public Switched Telephone Network (PSTN)

Show Answer
Answer: ((a))

Cellular networks

144

Which modulation technique is used to avoid phase ambiguity in BPSK?

  1. ((a))

    QPSK (Quadrature Phase Shift Keying)

  2. ((b))

    ASK (Amplitude Shift Keying)

  3. ((c))

    FSK (Frequency Shift Keying)

  4. ((d))

    DPSK (Differential Phase Shift Keying)

Show Answer
Answer: ((a))

QPSK (Quadrature Phase Shift Keying)

145

Narrowband FM is used in which of the following applications?

  1. ((a))

    Television transmission

  2. ((b))

    High-fidelity audio systems

  3. ((c))

    FM radio broadcasting

  4. ((d))

    Two-way mobile radio communication

Show Answer
Answer: ((a))

Television transmission

146

In a Common Emitter (CE) BJT amplifier, which of the following options is correct?

  1. ((a))

    The CE amplifier has the lowest input impedance among all the configurations.

  2. ((b))

    Its input impedance is lower than CB configuration but higher than CC configuration.

  3. ((c))

    The input characteristics are plotted between the input current (IB) and input voltage (VBE) at a constant IC.

  4. ((d))

    If the magnitude of the output voltage increases, the input current decreases.

Show Answer
Answer: ((a))

The CE amplifier has the lowest input impedance among all the configurations.

147

What type of error occurs due to unpredictable variations in measurement conditions?

  1. ((a))

    Gross error

  2. ((b))

    Random error

  3. ((c))

    Calibration error

  4. ((d))

    Systematic error

Show Answer
Answer: ((a))

Gross error

148

Which of the following statements best describes the operation of a bridge rectifier?

  1. ((a))

    In a bridge rectifier, current flows through two diodes during both positive and negative half cycles, leading to very high-power loss.

  2. ((b))

    The peak inverse voltage (PIV) of diode in a bridge rectifier is the same as in a center-tapped rectifier.

  3. ((c))

    The output voltage of a bridge rectifier consists of only DC components with no AC ripples.

  4. ((d))

    The bridge rectifier is a full-wave rectifier that does not require a center tapped transformer, improving transformer efficiency.

Show Answer
Answer: ((a))

In a bridge rectifier, current flows through two diodes during both positive and negative half cycles, leading to very high-power loss.

149

What is the primary goal of simplifying a Boolean expression before implementing it with gates?

  1. ((a))

    To make the circuit slower

  2. ((b))

    To increase the number of gates

  3. ((c))

    To reduce the number of gates and interconnections

  4. ((d))

    To increase power consumption

Show Answer
Answer: ((a))

To make the circuit slower

150

Manganin is a copper-manganese alloy that is widely used in precision resistors and temperature-sensitive applications. Which of the following properties makes manganin particularly useful in these applications?

  1. ((a))

    High tensile strength and ductility

  2. ((b))

    High electrical conductivity

  3. ((c))

    Low temperature coefficient of resistance

  4. ((d))

    High thermal coefficient of resistance

Show Answer
Answer: ((a))

High tensile strength and ductility

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