Official Paper

RRB JE CBT 2 (Mechanical Engineering) ReExam Official Paper (Held On: 04 Jun, 2025) (Previous Year Paper)

150 questions · 120 minutes · with answers · free

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General Abilities (50 questions)

1

Which of the following is an example of a chemical change?

  1. ((a))

    Dissolution of sugar in water

  2. ((b))

    Curdling of milk

  3. ((c))

    Freezing of water

  4. ((d))

    Tearing of paper

Show Answer
Answer: ((a))

Dissolution of sugar in water

2

If the area of contact increases while keeping the thrust constant, the pressure will __________.

  1. ((a))

    increase

  2. ((b))

    remain the same

  3. ((c))

    first increase, then decrease

  4. ((d))

    decrease

Show Answer
Answer: ((a))

increase

3

What happens when you use the 'Sort A to Z' option on a column containing text? 

  1. ((a))

    The text remains unchanged.

  2. ((b))

    The text is sorted alphabetically from A to Z.

  3. ((c))

    The text is sorted from Z to A. 

  4. ((d))

    The text is converted into numbers.

Show Answer
Answer: ((a))

The text remains unchanged.

4

The method of storage of nuclear wastes is to be done in _______.

  1. ((a))

    bottles

  2. ((b))

    dustbins

  3. ((c))

    open containers

  4. ((d))

    shielded containers

Show Answer
Answer: ((a))

bottles

5

When were the 38th National Games held in Uttarakhand?

  1. ((a))

    January 15 - 30, 2025

  2. ((b))

    January 28 - February 14, 2025

  3. ((c))

    February 10 - 25, 2025

  4. ((d))

    February 1 - 20, 2025

Show Answer
Answer: ((a))

January 15 - 30, 2025

6

In December 2024, Jasprit Bumrah became the fastest Indian bowler to reach 200 Test wickets during which of the following series/tournament? 

  1. ((a))

    Border-Gavaskar Trophy

  2. ((b))

    India vs England Test Series

  3. ((c))

    Asia Cup

  4. ((d))

    India vs New Zealand Test Series

Show Answer
Answer: ((a))

Border-Gavaskar Trophy

7

The Railways Employment of Members of the Armed Forces Act was passed in which of the following years?

  1. ((a))

    1951

  2. ((b))

    1962

  3. ((c))

    1965

  4. ((d))

    1957

Show Answer
Answer: ((a))

1951

8

Where is the magnetic field strength maximum around a magnet?

  1. ((a))

    Equidistant from the poles 

  2. ((b))

    At the poles of the magnet

  3. ((c))

    At infinity

  4. ((d))

    At the centre of the magnet

Show Answer
Answer: ((a))

Equidistant from the poles 

9

In an experiment, 25 g of reactant A reacts with 35 g of reactant B to form 50 g of product C and some amount of product D. What is the mass of product D?

  1. ((a))

    35 g

  2. ((b))

    25 g

  3. ((c))

    60 g

  4. ((d))

    10 g

Show Answer
Answer: ((a))

35 g

10

Which of the following is a zero waste procedure?

  1. ((a))

    Pest management

  2. ((b))

    Organic farming

  3. ((c))

    Integrated organic farming

  4. ((d))

    Inorganic farming

Show Answer
Answer: ((a))

Pest management

11

The greenhouse gas that is known to contribute the least amount to global warming is ___________.

  1. ((a))

    carbon dioxide

  2. ((b))

    methane

  3. ((c))

    CFCs

  4. ((d))

    nitrous oxide

Show Answer
Answer: ((a))

carbon dioxide

12

Two objects of masses 80 kg and 250 kg are placed 200 m apart. What is the gravitational force between them? (G = 6.7 × 10-11 N.m2/kg2)

  1. ((a))

    6.35 × 10-11 N

  2. ((b))

    5.75 × 10-11 N

  3. ((c))

    4.50 × 10-11 N

  4. ((d))

    3.35 × 10-11 N

Show Answer
Answer: ((a))

6.35 × 10-11 N

13

Which of the following is a string instrument?

  1. ((a))

    Tabla

  2. ((b))

    Sitar

  3. ((c))

    Flute

  4. ((d))

    Shehnai 

Show Answer
Answer: ((a))

Tabla

14

The speed of a wave is given by which of the following formulas?

  1. ((a))

    Speed = Time × Frequency

  2. ((b))

    Speed = Frequency × Amplitude

  3. ((c))

    Speed = Amplitude × Wavelength

  4. ((d))

    Speed = Frequency × Wavelength 

Show Answer
Answer: ((a))

Speed = Time × Frequency

15

The loss of forests, which is remarkably seen in the tropical areas of India, is around __________. 

  1. ((a))

    40%

  2. ((b))

    30%

  3. ((c))

    20%

  4. ((d))

    10%

Show Answer
Answer: ((a))

40%

16

As per Article 78, it is the duty of the Prime Minister to communicate all decisions of the Council of Ministers to whom? 

  1. ((a))

    Chief Justice of India

  2. ((b))

    Speaker of Lok Sabha

  3. ((c))

    President

  4. ((d))

    Vice President

Show Answer
Answer: ((a))

Chief Justice of India

17

What is the purpose of the 'BCC' field in an email? 

  1. ((a))

    It hides recipients from each other. 

  2. ((b))

    It deletes an email after it is read. 

  3. ((c))

    It allows recipients to see each others' addresses.

  4. ((d))

    It marks an email as urgent.

Show Answer
Answer: ((a))

It hides recipients from each other. 

18

_____ is the most efficient method used for the disposal of hospital-generated waste.

  1. ((a))

    Sanitary landfills

  2. ((b))

    Incinerator

  3. ((c))

    Furnace

  4. ((d))

    Open dumps

Show Answer
Answer: ((a))

Sanitary landfills

19

Under the Delhi Sultanate what was the name of the state laws that grew under the monarchy, even if they violated the Shari’at? 

  1. ((a))

    Farman

  2. ((b))

    Iqta

  3. ((c))

    Zawabit

  4. ((d))

    Fatwas

Show Answer
Answer: ((a))

Farman

20

Which statement correctly explains why liquids can flow?

  1. ((a))

    Liquids have no intermolecular forces.

  2. ((b))

    Liquids have loosely packed molecules that slide past each other. 

  3. ((c))

    Liquids do not have kinetic energy. 

  4. ((d))

    Liquid molecules move randomly without any restriction.

Show Answer
Answer: ((a))

Liquids have no intermolecular forces.

21

If three resistors of 15 Ω, 35 Ω and 50 Ω are connected in series to a 25-V battery, what is the current flowing in the circuit?

  1. ((a))

    4 A

  2. ((b))

    1.5 A

  3. ((c))

    0.25 A

  4. ((d))

    2.88 A

Show Answer
Answer: ((a))

4 A

22

What is the function of the Linux Shell?

  1. ((a))

    To directly manage hardware resources

  2. ((b))

    To execute user commands and act as an interface between the user and the kernel

  3. ((c))

    To store user data

  4. ((d))

    To create and delete partitions

Show Answer
Answer: ((a))

To directly manage hardware resources

23

Which of the following economic estimators provided estimates of India’s national and per capita income during the colonial period? 

  1. ((a))

    Adam Smith

  2. ((b))

    John Maynard Keynes

  3. ((c))

    VKRV Rao

  4. ((d))

    Karl Marx

Show Answer
Answer: ((a))

Adam Smith

24

Which of the following is NOT an example of an agrochemical?

  1. ((a))

    Pesticides

  2. ((b))

    Fungicides

  3. ((c))

    Herbicides

  4. ((d))

    Biogas

Show Answer
Answer: ((a))

Pesticides

25

What is the typical range of a Local Area Network (LAN)?

  1. ((a))

    Up to 10 km

  2. ((b))

    Up to 5 km

  3. ((c))

    Up to 1 km

  4. ((d))

    More than 50 km

Show Answer
Answer: ((a))

Up to 10 km

26

According to the Tendulkar methodology, what was the estimated national poverty line for rural areas in 2011-12?

  1. ((a))

    ₹816 per month

  2. ((b))

    ₹1,200 per month

  3. ((c))

    ₹1,000 per month

  4. ((d))

    ₹512 per month

Show Answer
Answer: ((a))

₹816 per month

27

What are the sand dunes commonly found in the Indian Desert called?

  1. ((a))

    Barchans

  2. ((b))

    Loess

  3. ((c))

    Moraines

  4. ((d))

    Cirques

Show Answer
Answer: ((a))

Barchans

28

If the mass of an object is 74.5 kg, what is its approximate weight on Earth? (Take g = 9.8 m/s2)

  1. ((a))

    730 N

  2. ((b))

    447 N

  3. ((c))

    7.6 N

  4. ((d))

    74.5 N

Show Answer
Answer: ((a))

730 N

29

The Montreal Protocol came into force in the year ________. 

  1. ((a))

    1986

  2. ((b))

    1989

  3. ((c))

    1990

  4. ((d))

    1992

Show Answer
Answer: ((a))

1986

30

Which property of solids allows them to be compressed the least compared to liquids and gases? 

  1. ((a))

    High intermolecular spaces

  2. ((b))

    The ability to diffuse into other solids

  3. ((c))

    Strong intermolecular forces and close packing of particles

  4. ((d))

    High kinetic energy of particles

Show Answer
Answer: ((a))

High intermolecular spaces

31

Which of the following best describes a heterogeneous mixture? 

  1. ((a))

    It has a uniform composition. 

  2. ((b))

    The components cannot be separated.

  3. ((c))

    The composition varies throughout the mixture.

  4. ((d))

    It contains only one phase

Show Answer
Answer: ((a))

It has a uniform composition. 

32

A student calculates the formula unit mass of calcium fluoride (CaF2). If the atomic masses of Ca and F are 40 u and 19 u, respectively, what is the correct formula unit mass?

  1. ((a))

    97 u

  2. ((b))

    78 u

  3. ((c))

    100 u

  4. ((d))

    59 u

Show Answer
Answer: ((a))

97 u

33

The area termed as the ozone hole is known to mainly develop over ______.

  1. ((a))

    India

  2. ((b))

    Africa

  3. ((c))

    Antartica

  4. ((d))

    America

Show Answer
Answer: ((a))

India

34

Who among the following is NOT appointed by the President of India? 

  1. ((a))

    Governors of States

  2. ((b))

    Vice President

  3. ((c))

    Chief Election Commissioner

  4. ((d))

    Comptroller and Auditor General 

Show Answer
Answer: ((a))

Governors of States

35

Which dynasty was overthrown by Chandragupta Maurya to establish the Mauryan Empire?

  1. ((a))

    Gupta Dynasty

  2. ((b))

    Kushan Dynasty

  3. ((c))

    Shunga Dynasty

  4. ((d))

    Nanda Dynasty

Show Answer
Answer: ((a))

Gupta Dynasty

36

Which of the following is NOT an example of system software?

  1. ((a))

    macOS

  2. ((b))

    Linux

  3. ((c))

    Microsoft Word

  4. ((d))

    Windows 10

Show Answer
Answer: ((a))

macOS

37

Which of the following metals is placed above aluminium and zinc in the reactivity series?

  1. ((a))

    Magnesium

  2. ((b))

    Iron

  3. ((c))

    Copper

  4. ((d))

    Carbon

Show Answer
Answer: ((a))

Magnesium

38

Who among the following won the gold medal in the women's high jump event at the National Games in February 2025?

  1. ((a))

    Vithya Ramraj 

  2. ((b))

    Pooja Singh

  3. ((c))

    Abhinaya Shetty

  4. ((d))

    Swapna Barman

Show Answer
Answer: ((a))

Vithya Ramraj 

39

Which of the following is an effective way to prevent rancidity in packaged food?

  1. ((a))

    Adding antioxidants

  2. ((b))

    Increasing moisture content 

  3. ((c))

    Keeping it in direct sunlight

  4. ((d))

    Storing in a warm place

Show Answer
Answer: ((a))

Adding antioxidants

40

The Punjab Plain is formed by which river system?

  1. ((a))

    Indus and its tributaries

  2. ((b))

    Narmada and its tributaries

  3. ((c))

    Ganga and its tributaries

  4. ((d))

    Brahmaputra and its tributaries

Show Answer
Answer: ((a))

Indus and its tributaries

41

An object is placed 25 cm in front of a convex lens with a focal length of 15 cm. What is the magnification produced by the lens?

  1. ((a))

    M = −2.5

  2. ((b))

    M = 1.5 

  3. ((c))

    M = 2.5

  4. ((d))

    M = −1.5

Show Answer
Answer: ((a))

M = −2.5

42

The effect of particulate matter which is a common air pollutant is maximally seen on the _______.

  1. ((a))

    intestines

  2. ((b))

    kidneys

  3. ((c))

    lungs

  4. ((d))

    liver

Show Answer
Answer: ((a))

intestines

43

The Indian Desert lies towards the western margins of which mountain range?

  1. ((a))

    Western Ghats

  2. ((b))

    Satpura Hills

  3. ((c))

    Vindhya Hills

  4. ((d))

    Aravali Hills

Show Answer
Answer: ((a))

Western Ghats

44

What is the primary goal of application security?

  1. ((a))

    To reduce the size of application files

  2. ((b))

     To enhance the graphical user interface of applications

  3. ((c))

    To protect applications from security threats by identifying and fixing vulnerabilities

  4. ((d))

    To increase the execution speed of applications

Show Answer
Answer: ((a))

To reduce the size of application files

45

Which of the following is an example of database management software?

  1. ((a))

    MS Paint

  2. ((b))

    Notepad

  3. ((c))

    PowerPoint

  4. ((d))

    Microsoft Access

Show Answer
Answer: ((a))

MS Paint

46

Which of the following is NOT a file management task? 

  1. ((a))

    Creating files

  2. ((b))

    Browsing the internet

  3. ((c))

    Renaming files

  4. ((d))

    Deleting files

Show Answer
Answer: ((a))

Creating files

47

Which mouse pointer appears when adjusting column width / cell width in a table?

  1. ((a))

    ↔ (Horizontal double-headed arrow) 

  2. ((b))

    ↕ (Vertical double-headed arrow)

  3. ((c))

    I-beam (Text cursor)

  4. ((d))

    Hand cursor

Show Answer
Answer: ((a))

↔ (Horizontal double-headed arrow) 

48

The melting of snow and ice caps from the polar regions is responsible for ________.

  1. ((a))

    condensation

  2. ((b))

    the rise in sea levels

  3. ((c))

    the decline in sea levels

  4. ((d))

    rainfall 

Show Answer
Answer: ((a))

condensation

49

In September 2024, which of the following Indian institutions was designated as the Thematic Hub for Quantum Computing under the National Quantum Mission?

  1. ((a))

    Indian Institute of Technology Madras

  2. ((b))

    Indian Institute of Technology Kanpur

  3. ((c))

    Indian Institute of Technology Gandhinagar

  4. ((d))

    Indian Institute of Science Bengaluru

Show Answer
Answer: ((a))

Indian Institute of Technology Madras

50

Which of the following is an example of a WAN?

  1. ((a))

    A Bluetooth connection between a phone and a laptop

  2. ((b))

    A home Wi-Fi network

  3. ((c))

    The internet

  4. ((d))

    A university campus network

Show Answer
Answer: ((a))

A Bluetooth connection between a phone and a laptop

Technical Abilities (100 questions)

51

Blowholes are welding defects caused by _________________. 

  1. ((a))

    too great a heat concentration

  2. ((b))

    poor edge preparation

  3. ((c))

    gas being trapped and due to moisture

  4. ((d))

    unsuitable parent metals used in the weld

Show Answer
Answer: ((a))

too great a heat concentration

52

Which region of the stress-strain curve as shown below represents work hardening in ductile materials?

  1. ((a))

    D-E

  2. ((b))

    C-D

  3. ((c))

    A-C

  4. ((d))

    E-F

Show Answer
Answer: ((a))

D-E

53

What is the basic function of a single volute casing in a centrifugal pump? 

  1. ((a))

    To direct the fluid flow and convert kinetic energy into pressure

  2. ((b))

    To reduce the temperature of the fluid

  3. ((c))

    To divide the fluid into multiple streams

  4. ((d))

    To increase the speed of the fluid

Show Answer
Answer: ((a))

To direct the fluid flow and convert kinetic energy into pressure

54

A material exhibits a large amount of plastic deformation before fracture and can absorb significant energy. This material is said to have: 

  1. ((a))

    high strength

  2. ((b))

    high hardness

  3. ((c))

    high toughness

  4. ((d))

    high modulus of elasticity

Show Answer
Answer: ((a))

high strength

55

The design of a semi-open impeller makes it suitable for:

  1. ((a))

    fluids with moderate amounts of suspended solids while providing better efficiency than open impellers

  2. ((b))

    liquids with very high solid content

  3. ((c))

    applications requiring the highest efficiency regardless of clogging

  4. ((d))

    only low flow rate applications

Show Answer
Answer: ((a))

fluids with moderate amounts of suspended solids while providing better efficiency than open impellers

56

To measure surface finish, the two types of stylus instruments used are:

  1. ((a))

    Digital and Analog

  2. ((b))

    Manual and Automated

  3. ((c))

    Contact and Non-contact

  4. ((d))

    True Datum and Surface Datum

Show Answer
Answer: ((a))

Digital and Analog

57

_____ is used for mixing oxygen and acetylene in gas welding processes.

  1. ((a))

    Earth clamp

  2. ((b))

    Goggles

  3. ((c))

    Welding torch

  4. ((d))

    Spark-lighter

Show Answer
Answer: ((a))

Earth clamp

58

The modulus of resilience is characterised by the area located under the stress-strain curve up to the:

  1. ((a))

    proportional limit

  2. ((b))

    ultimate point

  3. ((c))

    point where strain hardening starts

  4. ((d))

    fracture point

Show Answer
Answer: ((a))

proportional limit

59

Which of the following factors primarily influences the toughness of a material?

  1. ((a))

    Surface finish

  2. ((b))

    Grain size

  3. ((c))

    Yield strength

  4. ((d))

    Elastic modulus

Show Answer
Answer: ((a))

Surface finish

60

Which of the following CANNOT be generally utilised as an abrasive material in the grinding process?

  1. ((a))

    Super alloy

  2. ((b))

    Aluminium oxide

  3. ((c))

    Silicon carbide

  4. ((d))

    Diamond

Show Answer
Answer: ((a))

Super alloy

61

The efficiency of the Carnot cycle is defined as:

  1. ((a))

    Work doneHeat supplied\rm \frac{Work\ done}{Heat\ supplied}

  2. ((b))

    Heat suppliedWork done\rm \frac{Heat\ supplied}{Work\ done}

  3. ((c))

    Heat rejectedHeat suplied\rm \frac{Heat\ rejected}{Heat\ suplied}

  4. ((d))

    Work doneHeat rejected\rm \frac{Work\ done}{Heat\ rejected}

Show Answer
Answer: ((a))

Work doneHeat supplied\rm \frac{Work\ done}{Heat\ supplied}

62

In the Carbon Arc Welding (CAW) process, ____________ is used to create an electric arc

  1. ((a))

    pure graphite electrode

  2. ((b))

    cellulosic electrode

  3. ((c))

    rutile electrode

  4. ((d))

    stainless steel electrode

Show Answer
Answer: ((a))

pure graphite electrode

63

Which test is commonly used to measure the malleability of a material?

  1. ((a))

    Impact test

  2. ((b))

    Hardness test

  3. ((c))

    Torsion test 

  4. ((d))

    Compression test

Show Answer
Answer: ((a))

Impact test

64

How does indicated power differ from brake power in an internal combustion engine?

  1. ((a))

    Indicated power is measured at the engine’s output shaft, while brake power is measured in the cylinders.

  2. ((b))

    Both indicated and brake power represent the same value under ideal conditions

  3. ((c))

    Indicated power is derived from combustion chamber pressures, whereas brake power is the net output at the crankshaft after mechanical losses.

  4. ((d))

    Indicated power accounts for frictional losses, whereas brake power does not

Show Answer
Answer: ((a))

Indicated power is measured at the engine’s output shaft, while brake power is measured in the cylinders.

65

Name the part of a milling machine on which milling cutters are securely mounted and rotated.

  1. ((a))

    Front brace

  2. ((b))

    Arbor

  3. ((c))

    Saddle

  4. ((d))

    Overhanging arm

Show Answer
Answer: ((a))

Front brace

66

A thin cylindrical pressure vessel with inside radius ‘R' and metal thickness 't' is subject to an internal fluid pressure 'P.' What is the value of longitudinal stress?

  1. ((a))

    2PRt\rm \frac{2PR}{t}

  2. ((b))

    3PR2t\rm \frac{3PR}{2t}

  3. ((c))

    PR2t\rm \frac{PR}{2t}

  4. ((d))

    PRt\rm \frac{PR}{t}

Show Answer
Answer: ((a))

2PRt\rm \frac{2PR}{t}

67

A cantilever beam with span length L m carries a point load ‘w’ N at the free end. What will be the value of the resisting bending moment at the fixed end?

  1. ((a))

    Zero

  2. ((b))

    2wL

  3. ((c))

    wL2\rm \frac{wL}{2}

  4. ((d))

    wL

Show Answer
Answer: ((a))

Zero

68

The manometric efficiency in a pump is the ratio of:

  1. ((a))

    the theoretical head to the actual head

  2. ((b))

    the actual pressure head produced to the theoretical pressure head

  3. ((c))

    the fluid density to the pump speed

  4. ((d))

    the temperature difference between inlet and outlet 

Show Answer
Answer: ((a))

the theoretical head to the actual head

69

Parallel shank type and morse taper shank type drills belong to _____ type of drills. 

  1. ((a))

    twist

  2. ((b))

    hexagonal

  3. ((c))

    straight-fluted

  4. ((d))

    flat

Show Answer
Answer: ((a))

twist

70

What is the maximum angle that can be generally set using a sine bar?

  1. ((a))

    90°

  2. ((b))

    45°

  3. ((c))

    75°

  4. ((d))

    60°

Show Answer
Answer: ((a))

90°

71

Which of the following is NOT a type of nitriding process?

  1. ((a))

    Plasma nitriding

  2. ((b))

    Gas nitriding

  3. ((c))

    Liquid nitriding

  4. ((d))

    Vacuum nitriding 

Show Answer
Answer: ((a))

Plasma nitriding

72

What is a coplanar force system?

  1. ((a))

    A system where forces act only in one direction

  2. ((b))

    A system where all forces lie in the same plane

  3. ((c))

    A system where forces do not intersect at a point 

  4. ((d))

    A system where all forces lie in different planes

Show Answer
Answer: ((a))

A system where forces act only in one direction

73

What happens to the mechanical properties of mild steel when carbon content increases?

  1. ((a))

    Both strength and hardness decrease

  2. ((b))

    Both strength and ductility increase

  3. ((c))

    Strength decreases and ductility increases

  4. ((d))

    Strength increases and ductility decreases

Show Answer
Answer: ((a))

Both strength and hardness decrease

74

A cantilever beam with a span length of L m carries a uniform moment of intensity ‘M’ Nm/m. Which of the following statements is correct? 

  1. ((a))

    Shear force throughout the length will be zero.

  2. ((b))

    Shear force throughout the length will be ML/2. 

  3. ((c))

    Shear force throughout the length will be ML. 

  4. ((d))

    Shear force throughout the length will be M/L.

Show Answer
Answer: ((a))

Shear force throughout the length will be zero.

75

The disadvantage of the early shadow projector was that the:

  1. ((a))

    image was too small

  2. ((b))

    image was distorted

  3. ((c))

    magnification was insufficient

  4. ((d))

    screen was too far from the operator 

Show Answer
Answer: ((a))

image was too small

76

Which of the following back pressure gauges is NOT used in Pneumatic Comparators?

  1. ((a))

    Absolute back pressure gauge

  2. ((b))

    Venturi back pressure gauge

  3. ((c))

    Water column back pressure gauge

  4. ((d))

    Differential back pressure gauge

Show Answer
Answer: ((a))

Absolute back pressure gauge

77

The type of surfaces best suited for measuring surface roughness using a Light Interference Microscope are _____. 

  1. ((a))

    surfaces requiring high-precision 3D mapping

  2. ((b))

    liquid surfaces

  3. ((c))

    very large surface areas

  4. ((d))

    soft or thin surfaces

Show Answer
Answer: ((a))

surfaces requiring high-precision 3D mapping

78

The moment of inertia of a circular area about a tangent to the circle is calculated as the moment of inertia of the circular area about its centroidal axis in the plane of the lamina ______ (where r is the circle radius).

  1. ((a))

    -πr4

  2. ((b))

    +πr4

  3. ((c))

    ×1.5

  4. ((d))

    ×πr2/2

Show Answer
Answer: ((a))

-πr4

79

Which of the following end conditions could characterise a cantilever beam?

  1. ((a))

    A hinged support at one end and free at the other

  2. ((b))

    A fixed support at one end and pin support at the other

  3. ((c))

    A fixed support at one end and free at the other 

  4. ((d))

    A roller support at one end and hinged at the other

Show Answer
Answer: ((a))

A hinged support at one end and free at the other

80

What is the primary mechanism by which thermal radiation transfers energy?

  1. ((a))

    Direct transfer via physical contact 

  2. ((b))

    Convection due to fluid motion

  3. ((c))

    Electromagnetic waves

  4. ((d))

    Conduction through molecular collisions

Show Answer
Answer: ((a))

Direct transfer via physical contact 

81

The Stefan-Boltzmann law is derived from:

  1. ((a))

    Planck’s Law

  2. ((b))

    Wien’s Displacement Law

  3. ((c))

    Fourier’s Law

  4. ((d))

    Kirchhoff’s Law

Show Answer
Answer: ((a))

Planck’s Law

82

Forced convection is primarily characterised by:

  1. ((a))

    heat transfer occurring solely through radiation

  2. ((b))

    the use of external devices such as fans or pumps to move the fluid

  3. ((c))

    the natural buoyancy-driven flow of the fluid

  4. ((d))

    the absence of any temperature gradients in the fluid 

Show Answer
Answer: ((a))

heat transfer occurring solely through radiation

83

EOQ stands for:

  1. ((a))

    Ensemble Ordering Quantity

  2. ((b))

    Electronic Ordering Quantity

  3. ((c))

    Economic Ordering Quantity

  4. ((d))

    Electrical Ordering Quantity

Show Answer
Answer: ((a))

Ensemble Ordering Quantity

84

Which of the following statements is correct regarding electroplating?

  1. ((a))

    The rate of anodic dissolution is found greater to the rate of deposition of metal onto the substrate

  2. ((b))

    The metal is deposited on the anode. 

  3. ((c))

    The dissolution of metal starts at the cathode

  4. ((d))

    The rate of anodic dissolution is found equal to the rate of deposition of metal onto the substrate. 

Show Answer
Answer: ((a))

The rate of anodic dissolution is found greater to the rate of deposition of metal onto the substrate

85

In a radial flow pump, the fluid primarily flows:

  1. ((a))

    outward radially from the impeller centre

  2. ((b))

    inward radially toward the impeller centre

  3. ((c))

    in a circular path around the pump shaft

  4. ((d))

    parallel to the pump shaft

Show Answer
Answer: ((a))

outward radially from the impeller centre

86

Given an annual usage value of 400 units, the procurement cost is ₹20 per order, cost per piece is ₹100 and cost of carrying inventory is 10%. Calculate the economic order quantity.

  1. ((a))

    30

  2. ((b))

    40

  3. ((c))

    50

  4. ((d))

    60

Show Answer
Answer: ((a))

30

87

The influence of forecasting in volume decision-making with regards to production is that it:

  1. ((a))

    determines the specific design of the product

  2. ((b))

    determines whether production is for stock or for immediate orders

  3. ((c))

    reduces manufacturing costs

  4. ((d))

    ensures that all products meet international standards

Show Answer
Answer: ((a))

determines the specific design of the product

88

What bond is commonly employed in super abrasive grinding wheels? 

  1. ((a))

    Oxychloride bond

  2. ((b))

    Shellac bond

  3. ((c))

    Brazed bond

  4. ((d))

    Metal bond

Show Answer
Answer: ((a))

Oxychloride bond

89

The reason for a company to strongly favour buying a component even if they could make it themselves is that the:

  1. ((a))

    company wants to maintain design secrecy

  2. ((b))

    company wants to improve its quality control

  3. ((c))

    company has excess manufacturing capacity

  4. ((d))

    vendor offers a lower cost and higher quality

Show Answer
Answer: ((a))

company wants to maintain design secrecy

90

What is the effect of compression ratio (CR) on the air standard efficiency of otto and diesel cycles?

  1. ((a))

    Higher CR always leads to higher efficiency

  2. ((b))

    Lower CR always leads to higher efficiency.

  3. ((c))

    CR has no effect on efficiency. 

  4. ((d))

    Efficiency increases with CR in SI engines and decreases in CI engines.

Show Answer
Answer: ((a))

Higher CR always leads to higher efficiency

91

In the resolution of a force, along which of the following directions is a force generally resolved?

  1. ((a))

    Any three random directions

  2. ((b))

    A single fixed direction 

  3. ((c))

    Two mutually perpendicular directions

  4. ((d))

    Two parallel directions 

Show Answer
Answer: ((a))

Any three random directions

92

When is the lead screw engaged in a lathe?

  1. ((a))

    Only for turning and facing operations 

  2. ((b))

    Only during thread-cutting operations

  3. ((c))

    During both knurling and continuous feed motion

  4. ((d))

    Continuously for all machining processes

Show Answer
Answer: ((a))

Only for turning and facing operations 

93

The value of density of water at room temperature is _____.

  1. ((a))

    1 gm/cm3 or 1000 kg/m3

  2. ((b))

    2 gm/cm3 or 2000 kg/m3

  3. ((c))

    3 gm/cm3 or 3000 kg/m3

  4. ((d))

    10 gm/cm3 or 10000 kg/m3

Show Answer
Answer: ((a))

1 gm/cm3 or 1000 kg/m3

94

_________ is used in Submerged Arc Welding process.

  1. ((a))

    Tungsten electrode

  2. ((b))

    Carbon electrode

  3. ((c))

    Consumable bare electrode

  4. ((d))

    Graphite electrode 

Show Answer
Answer: ((a))

Tungsten electrode

95

The area between the 'Total revenue' line and the 'Total costs' line to the right of the break-even point represents:

  1. ((a))

    profit zone

  2. ((b))

    variable costs 

  3. ((c))

    fixed costs

  4. ((d))

    loss zone

Show Answer
Answer: ((a))

profit zone

96

If the degree of the shear force diagram is x, then the:

  1. ((a))

    degree of the bending moment diagram is x − 1

  2. ((b))

    degree of the loading curve is x + 1

  3. ((c))

    degree of the loading curve is x

  4. ((d))

    degree of the bending moment diagram is x + 1

Show Answer
Answer: ((a))

degree of the bending moment diagram is x − 1

97

What is the accuracy of the universal bevel protractor? 

  1. ((a))

    8-minute (8')

  2. ((b))

    5-minute (5')

  3. ((c))

    12-minute (12')

  4. ((d))

    15-minute (15')

Show Answer
Answer: ((a))

8-minute (8')

98

The ______ concept is derived from the Pareto’s 80/20 rule curve. 

  1. ((a))

    VED

  2. ((b))

    ABC

  3. ((c))

    XYZ

  4. ((d))

    FSN

Show Answer
Answer: ((a))

VED

99

Gauge pressure is measured as:

  1. ((a))

    the pressure relative to a perfect vacuum 

  2. ((b))

    the pressure including atmospheric pressure

  3. ((c))

    the pressure due solely to the fluid's density

  4. ((d))

    the difference between absolute pressure and atmospheric pressure

Show Answer
Answer: ((a))

the pressure relative to a perfect vacuum 

100

Which of the following components generally evaporate in the organic coating?

  1. ((a))

    Additives

  2. ((b))

    Binder

  3. ((c))

    Pigments

  4. ((d))

    Solvents

Show Answer
Answer: ((a))

Additives

101

Compared to a single volute casing, a double volute casing with a vaned diffuser generally provides:

  1. ((a))

    lower pressure generation capability 

  2. ((b))

    increased wear on pump components

  3. ((c))

    lower efficiency due to complex flow paths

  4. ((d))

    better hydraulic performance and efficiency

Show Answer
Answer: ((a))

lower pressure generation capability 

102

Which of the following elements is NOT a primary alloying element in stainless steel?

  1. ((a))

    Lead

  2. ((b))

    Chromium

  3. ((c))

    Carbon

  4. ((d))

    Nickel

Show Answer
Answer: ((a))

Lead

103

In the up-milling process, the metal is removed in the form of small chips by a cutter rotating _____.

  1. ((a))

    against the direction of the travel of the workpiece

  2. ((b))

    perpendicular to the direction of the travel of the workpiece

  3. ((c))

    in the same direction of the feed of the workpiece

  4. ((d))

    Metal will not be removed in the milling process.

Show Answer
Answer: ((a))

against the direction of the travel of the workpiece

104

According to Herzberg's Two-Factor Theory, the 'hygiene factor' that leads to job dissatisfaction is: 

  1. ((a))

    responsibility 

  2. ((b))

    achievement

  3. ((c))

    recognition

  4. ((d))

    salary

Show Answer
Answer: ((a))

responsibility 

105

What type of abrasive is suitable for grinding glass and ceramic materials?

  1. ((a))

    Copper boron nitride 

  2. ((b))

    Silicon carbide

  3. ((c))

    Magnesium oxide

  4. ((d))

    Diamond

Show Answer
Answer: ((a))

Copper boron nitride 

106

The flange of an I-section is 100 mm wide and 10 mm thick, and has moment of inertia If about its own centroidal axis parallel to flange length, in the plane of the flange. Its centroidal axis is 50 mm from the centroidal axis X-X of the I-section normal to the web in the plane of the I-section. Area moment of inertia of the flange about axis X-X is:

  1. ((a))

    If + 50,000 mm4

  2. ((b))

    8333 mm4

  3. ((c))

    If − 25X105 mm4

  4. ((d))

    If + 25X105 mm4

Show Answer
Answer: ((a))

If + 50,000 mm4

107

At which location on a beam section will the maximum bending moment occur, concerning the shear force?

  1. ((a))

    Bending moment does not depend upon shear force.

  2. ((b))

    Where shear force will be maximum

  3. ((c))

    Where shear force will be minimum

  4. ((d))

    Where shear force will change its sign

Show Answer
Answer: ((a))

Bending moment does not depend upon shear force.

108

In a parting-off operation, how is the cutting tool fed into the workpiece?

  1. ((a))

    By moving the carriage along the lathe bed

  2. ((b))

    By rotating the cross-slide screw by hand

  3. ((c))

    By adjusting the tailstock manually

  4. ((d))

    By rotating the headstock spindle directly

Show Answer
Answer: ((a))

By moving the carriage along the lathe bed

109

A symmetrical channel section has width of its top and bottom flanges as 100 mm and thickness 10 mm. The web is 80 mm high between flanges and 10 mm thick. Its moment of inertia about a centroidal axis in its plane parallel to the flanges is 449.3 X 104 mm4 . Calculate its moment of inertia about a parallel axis at the top face of the upper flange.

  1. ((a))

    1415 × 103

  2. ((b))

    1149.3 × 104

  3. ((c))

    43,000

  4. ((d))

    20.3 × 104

Show Answer
Answer: ((a))

1415 × 103

110

Identify the gas used in Tungsten Inert Gas Welding (TIG).

  1. ((a))

    Oxygen-nitrogen mixtures

  2. ((b))

    Hydrogen-nitrogen mixtures

  3. ((c))

    Oxygen-hydrogen mixtures

  4. ((d))

    Argon-helium mixtures

Show Answer
Answer: ((a))

Oxygen-nitrogen mixtures

111

The thermal efficiency of the Otto cycle is a function of:

  1. ((a))

    engine size and speed

  2. ((b))

    heat supplied and pressure ratio

  3. ((c))

    temperature and mass flow rate 

  4. ((d))

    compression ratio and the ratio of specific heats

Show Answer
Answer: ((a))

engine size and speed

112

A centrifugal pump has a hydraulic power output of 10 kW and consumes 15 kW of mechanical power. Calculate its overall efficiency.

  1. ((a))

    80%

  2. ((b))

    66.7%

  3. ((c))

    50%

  4. ((d))

    75%

Show Answer
Answer: ((a))

80%

113

In a four-stroke diesel engine, the exhaust valve opens before the piston reaches the Bottom Dead Center to: 

  1. ((a))

    enhance air-fuel mixing

  2. ((b))

    improve fuel atomisation

  3. ((c))

    reduce pumping losses

  4. ((d))

    increase the compression ratio

Show Answer
Answer: ((a))

enhance air-fuel mixing

114

In Arc Welding process, welding cables are used for _______

  1. ((a))

    frequently igniting the welding torch

  2. ((b))

    cleaning the surface to be welded

  3. ((c))

    connecting to the hand held electrode directly and conducting current to it

  4. ((d))

    conduction of current from the welding machine to the electrode holder 

Show Answer
Answer: ((a))

frequently igniting the welding torch

115

The reversed Carnot cycle is used as a basis for which of the following?

  1. ((a))

    Heat engines 

  2. ((b))

    Steam turbines

  3. ((c))

    Refrigerators and heat pumps 

  4. ((d))

    Internal combustion engines

Show Answer
Answer: ((a))

Heat engines 

116

What is the purpose of introducing two equal and opposite forces at a different point on a rigid body?

  1. ((a))

    To balance the rotational motion of the body

  2. ((b))

    To change the direction of the applied force

  3. ((c))

    To increase the force acting on the body 

  4. ((d))

    To transfer the original force to a new location

Show Answer
Answer: ((a))

To balance the rotational motion of the body

117

Which of the following can be used for angular measurements?

  1. ((a))

    Micrometer

  2. ((b))

    Slip Gauge

  3. ((c))

    Depth Gauge 

  4. ((d))

    Autocollimator 

Show Answer
Answer: ((a))

Micrometer

118

In the analytical method, how is the resultant force determined when all forces act in the same direction? 

  1. ((a))

    By dividing the total force by the number of forces

  2. ((b))

    By adding all the forces together 

  3. ((c))

    By subtracting the smallest force from the largest 

  4. ((d))

    By multiplying all the forces together 

Show Answer
Answer: ((a))

By dividing the total force by the number of forces

119

Which of the following pigments provide anti-corrosion characteristics in the organic coating?

  1. ((a))

    Lithopone

  2. ((b))

    Barium metaborate

  3. ((c))

    Limestone

  4. ((d))

    Zinc phosphate 

Show Answer
Answer: ((a))

Lithopone

120

The function of fluxes in soldering is _____.

  1. ((a))

    to remove oxides and other surface compounds from the surfaces to be soldered

  2. ((b))

    to heat metal over a range of temperature up to fusion and then allow to cool

  3. ((c))

    to use consumable bare electrode in combination with a flux feeder tube

  4. ((d))

    to remove dirt particles and other surface compounds from the surfaces to be soldered

Show Answer
Answer: ((a))

to remove oxides and other surface compounds from the surfaces to be soldered

121

The purpose of scheduling in Production Planning and Control is to:

  1. ((a))

    design new product layouts

  2. ((b))

    determine the cost of materials

  3. ((c))

    hire new personnel

  4. ((d))

    ensure products are completed on time 

Show Answer
Answer: ((a))

design new product layouts

122

Which of the following is NOT a requirement of an ignition system in a spark-ignition engine?

  1. ((a))

    Timing the spark to coincide with the compression stroke

  2. ((b))

    Mixing air and fuel in the intake manifold 

  3. ((c))

    Maintaining consistent spark duration across all RPMs 

  4. ((d))

    Generating sufficient voltage to jump the spark plug gap 

Show Answer
Answer: ((a))

Timing the spark to coincide with the compression stroke

123

If any part is immersed in a heated 'magnesium dihydrogen phosphate' solution, then what could be the coating process? 

  1. ((a))

    Parkerizing

  2. ((b))

    Calorising

  3. ((c))

    Anodising

  4. ((d))

    Cladding

Show Answer
Answer: ((a))

Parkerizing

124

Fatigue failure in materials occurs due to:

  1. ((a))

    cyclic loading

  2. ((b))

    low temperature

  3. ((c))

    high temperature

  4. ((d))

    constant stress

Show Answer
Answer: ((a))

cyclic loading

125

Which of the following best describes the primary function of a simple carburetor in a petrol engine?

  1. ((a))

    To regulate exhaust emissions via catalytic conversion

  2. ((b))

    To atomise and mix fuel with air in the proper ratio

  3. ((c))

    To electronically control the fuel injection timing 

  4. ((d))

    To compress the air-fuel mixture before combustion

Show Answer
Answer: ((a))

To regulate exhaust emissions via catalytic conversion

126

Which of the following statements best describes a special-purpose lathe used for heavy-duty applications?

  1. ((a))

    A wheel lathe is designed for machining railway wheels, including journals and treads

  2. ((b))

    A gap bed lathe is mainly used for cutting small, high-precision components. 

  3. ((c))

    A missile lathe is designed for lightweight parts with small diameters. 

  4. ((d))

    A T-lathe is used for machining flat plates and sheet metal components. 

Show Answer
Answer: ((a))

A wheel lathe is designed for machining railway wheels, including journals and treads

127

For a closed system undergoing a process (not a cycle), the first law is expressed as: 

  1. ((a))

    ΔU = Q − W

  2. ((b))

    ΔS ≥ 0

  3. ((c))

    PV = nRT

  4. ((d))

    Q = W

Show Answer
Answer: ((a))

ΔU = Q − W

128

Which factor does NOT directly affect the power required to drive a centrifugal pump?

  1. ((a))

    Atmospheric pressure

  2. ((b))

    Fluid viscosity

  3. ((c))

    Flow rate

  4. ((d))

    Fluid density

Show Answer
Answer: ((a))

Atmospheric pressure

129

What is Lack of Fusion in welding defects?

  1. ((a))

    It is the failure of the filler metal to penetrate into the welding joint.

  2. ((b))

    It is the entrapment of slag or other impurities in the weld. 

  3. ((c))

    It is the failure of the filler metal to fuse with the parent metal.

  4. ((d))

    It is a group of small holes throughout the weld metal.

Show Answer
Answer: ((a))

It is the failure of the filler metal to penetrate into the welding joint.

130

Which of the following is true about the weldability of mild steel and alloy steel?

  1. ((a))

    Weldability depends only on the thickness of the steel. 

  2. ((b))

    Alloy steel is easier to weld than mild steel. 

  3. ((c))

    Both mild and alloy steel have the same weldability

  4. ((d))

    Mild steel is easier to weld than alloy steel. 

Show Answer
Answer: ((a))

Weldability depends only on the thickness of the steel. 

131

If the area under the shear force diagram between two specified points is equal to P, then the difference in the bending moments at those points will be:

  1. ((a))

    Zero

  2. ((b))

    P

  3. ((c))

    2P

  4. ((d))

    P2\frac{P}{2}

Show Answer
Answer: ((a))

Zero

132

Three collinear horizontal forces of magnitudes 250 N, 150 N and 350 N are acting on a rigid body. If the 150 N force acts in the opposite direction, determine the resultant force. 

  1. ((a))

    550 N

  2. ((b))

    350 N

  3. ((c))

    250 N

  4. ((d))

    450 N

Show Answer
Answer: ((a))

550 N

133

Which of the following is NOT a feature of pneumatic comparators? 

  1. ((a))

    High range of amplification 

  2. ((b))

    Non-contact inspection of work parts

  3. ((c))

    No wearing of parts

  4. ((d))

    Presence of hysteresis 

Show Answer
Answer: ((a))

High range of amplification 

134

Which of the following interactions is expected to produce chip during a grinding process?

  1. ((a))

    Chip-bond

  2. ((b))

    Bond-workpiece 

  3. ((c))

    Chip-workpiece

  4. ((d))

    Grit-workpiece

Show Answer
Answer: ((a))

Chip-bond

135

What does mean effective pressure (MEP) indicate in engine performance analysis?

  1. ((a))

    The pressure of the fuel injected into the cylinder 

  2. ((b))

    The average pressure acting on the piston during the complete engine cycle that would produce the measured work output

  3. ((c))

    The maximum pressure reached in the combustion chamber

  4. ((d))

    The difference between intake and exhaust pressures

Show Answer
Answer: ((a))

The pressure of the fuel injected into the cylinder 

136

In a two-stroke petrol engine, the inlet port is opened by the piston:

  1. ((a))

    40° to 55° before BDC

  2. ((b))

    30° to 40° after BDC 

  3. ((c))

    45° to 55° before TDC

  4. ((d))

    30° to 40° before BDC

Show Answer
Answer: ((a))

40° to 55° before BDC

137

In the _____ method, a large amount of solder is melted in a tank that is closed. 

  1. ((a))

    soldering iron

  2. ((b))

    infrared soldering

  3. ((c))

    flame soldering

  4. ((d))

    dip soldering

Show Answer
Answer: ((a))

soldering iron

138

IC engines are classified into carburetor engine and air injection engine based on the:

  1. ((a))

    speed of the engine

  2. ((b))

    number of cylinders

  3. ((c))

    method of fuel injection

  4. ((d))

    cooling system used

Show Answer
Answer: ((a))

speed of the engine

139

Which of the following is generally used for melting metal in the metallic gun type of metal spraying process?

  1. ((a))

    Plasma torch 

  2. ((b))

    Compressed air

  3. ((c))

    Oxy acetylene flame

  4. ((d))

    Electric arc

Show Answer
Answer: ((a))

Plasma torch 

140

Thermal stress in a composite bar DOES NOT depend on which of the following factors?

  1. ((a))

    Coefficient of thermal expansion

  2. ((b))

    Temperature change

  3. ((c))

    Area of cross-section

  4. ((d))

    Modulus of elasticity

Show Answer
Answer: ((a))

Coefficient of thermal expansion

141

When using a Venturi meter, a decrease in the cross-sectional area causes:

  1. ((a))

    an increase in static pressure

  2. ((b))

    no change in velocity

  3. ((c))

    a decrease in static pressure

  4. ((d))

    an increase in fluid density

Show Answer
Answer: ((a))

an increase in static pressure

142

Broaching is a _____ that uses a toothed tool to remove the material from the workpiece. 

  1. ((a))

    machining process

  2. ((b))

    boring process 

  3. ((c))

    casting process

  4. ((d))

    grinding process

Show Answer
Answer: ((a))

machining process

143

The diagram below shows the stress-strain curves of two materials, Material A and Material B. Material A has a finer grain structure, while Material B has a coarser grain structure. Based on the diagram, which of the following statements is correct regarding their toughness?

  1. ((a))

    Material A (finer grain size) has higher toughness than Material B (coarser grain size).

  2. ((b))

    Both materials have the same toughness, as indicated by their identical total strain values. 

  3. ((c))

    Toughness can be determined directly by comparing the slopes of the stress-strain curves

  4. ((d))

    Material A (finer grain size) has lower toughness than Material B (coarser grain size). 

Show Answer
Answer: ((a))

Material A (finer grain size) has higher toughness than Material B (coarser grain size).

144

If 30 m is the height difference between the two rollers and 60 m is the distance between the centres of the rollers, what is the angle formed between the upper surface of a sine bar and the surface plate (datum)?

  1. ((a))

    60°

  2. ((b))

    45°

  3. ((c))

    30°

  4. ((d))

    90°

Show Answer
Answer: ((a))

60°

145

What is lack of penetration in welding defects?

  1. ((a))

    Failure of the filler metal to fuse with the parent metal

  2. ((b))

    Failure of the filler metal to penetrate into the root of the joint

  3. ((c))

    Cracks either in the weld metal or in the parent metal 

  4. ((d))

    Small holes throughout the weld metal

Show Answer
Answer: ((a))

Failure of the filler metal to fuse with the parent metal

146

The _____ in a broaching tooth is provided to prevent rubbing of the tool with the workpiece.

  1. ((a))

    front rake angle

  2. ((b))

    back-off angle 

  3. ((c))

    hook angle

  4. ((d))

    face angle

Show Answer
Answer: ((a))

front rake angle

147

Which of the following statements accurately describes vacuum pressure?

  1. ((a))

    It is the pressure exerted by the atmospheric air. 

  2. ((b))

    It is the pressure due to the weight of a fluid column. 

  3. ((c))

    It is the absolute pressure at any point in a fluid.

  4. ((d))

    It is the pressure below atmospheric pressure in a system.

Show Answer
Answer: ((a))

It is the pressure exerted by the atmospheric air. 

148

The function of the supporting column in a Tool Maker’s Microscope is to _____. 

  1. ((a))

    provide vertical working distance

  2. ((b))

    magnify the image

  3. ((c))

    hold the specimen in place

  4. ((d))

    illuminate the workpiece

Show Answer
Answer: ((a))

provide vertical working distance

149

In production engineering, gear hobbing is a _____.

  1. ((a))

    machining process 

  2. ((b))

    surface finishing process

  3. ((c))

    primary shaping process

  4. ((d))

    joining process

Show Answer
Answer: ((a))

machining process 

150

In graphical representation of the cost–volume relationship, the point where the 'Total revenue' line intersects the 'Total costs' line represents the:

  1. ((a))

    maximum profit 

  2. ((b))

    variable costs

  3. ((c))

    break-even point

  4. ((d))

    margin of safety

Show Answer
Answer: ((a))

maximum profit 

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