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Question 71

RRB JE 2026• Technical Abilities

In the magnetic trip mechanism of an MCB, which sequence correctly describes the tripping action during a short circuit?

  1. AOption (a)

    Fault current → contact resistance increases → plunger attracted → latch released

  2. BOption (b)

    Fault current → plunger released → magnetic field generated → contacts open

  3. COption (c)

    Fault current → bimetal strip bends → latch released → contacts open

  4. DOption (d)

    Fault current → magnetic field generated → plunger attracted → latch released

View answer & explanation

Correct answer

Answer: (a)A.

Fault current → contact resistance increases → plunger attracted → latch released

Explanation not yet available.

Question 72

RRB JE 2026• Technical Abilities

How many PN junctions are present in the structure of a Silicon Controlled Rectifier (SCR)?

  1. AOption (a)

    Four

  2. BOption (b)

    Two

  3. COption (c)

    One

  4. DOption (d)

    Three

View answer & explanation

Correct answer

Answer: (a)A.

Four

Explanation not yet available.

Question 73

RRB JE 2026• Technical Abilities

An engineer is designing a feedback control system using a potentiometer transducer to measure angular position.

What is the primary effect if a voltmeter with low resistance is connected to measure the potentiometer output?

  1. AOption (a)

    It reduces the mechanical lifespan of the potentiometer due to excess current

  2. BOption (b)

    It causes loading error, resulting in nonlinear output voltage relative to wiper position

  3. COption (c)

    It maximizes sensitivity and accuracy of the measuring instrument

  4. DOption (d)

    It increases output signal noise regardless of wiper position

View answer & explanation

Correct answer

Answer: (a)A.

It reduces the mechanical lifespan of the potentiometer due to excess current

Explanation not yet available.

Question 74

RRB JE 2026• Technical Abilities

Using De Morgan’s law, what is the equivalent of \((\overline{P.Q.R})\) ?

  1. AOption (a)

    \(\overline{P}+\overline{Q}+\overline{R}\)

  2. BOption (b)

    P . Q . R

  3. COption (c)

    \( \overline{P}.\overline{Q}.\overline{R} \)

  4. DOption (d)

    P + Q + R

View answer & explanation

Correct answer

Answer: (a)A.

\(\overline{P}+\overline{Q}+\overline{R}\)

Explanation not yet available.

Question 75

RRB JE 2026• Technical Abilities

What allows a Radar system to detect the presence of a target?

  1. AOption (a)

    Electromagnetic wave reflection

  2. BOption (b)

    Acoustic resonance

  3. COption (c)

    Chemical ionization

  4. DOption (d)

    Atmospheric refraction

View answer & explanation

Correct answer

Answer: (a)A.

Electromagnetic wave reflection

Explanation not yet available.

Question 76

RRB JE 2026• Technical Abilities

A 1 mA,100 Ω meter movement is converted to a 100 mA ammeter using a parallel shunt resistor. If this shunt resistor suddenly becomes open-circuited while a steady line current of 80 mA is passing through the meter, what is the most likely outcome?

  1. AOption (a)

    The meter continues to indicate the measured current correctly

  2. BOption (b)

    The meter indication drops to zero due to loss of shunt current

  3. COption (c)

    The meter becomes more sensitive and shows larger deflections

  4. DOption (d)

    Excessive current may flow through the meter movement and damage it

View answer & explanation

Correct answer

Answer: (a)A.

The meter continues to indicate the measured current correctly

Explanation not yet available.

Question 77

RRB JE 2026• Technical Abilities

Which operator is used for dynamic memory allocation in C++?

  1. AOption (a)

    alloc

  2. BOption (b)

    allocate

  3. COption (c)

    delete

  4. DOption (d)

    new

View answer & explanation

Correct answer

Answer: (a)A.

alloc

Explanation not yet available.

Question 78

RRB JE 2026• Technical Abilities

What is the output of the give C language code snippet?

void f(int x)

{

x = x + 5;

}

int main()

{

int a = 10;

f(a);

printf("%d",a);

return 0;

}

  1. AOption (a)

    15

  2. BOption (b)

    5

  3. COption (c)

    10

  4. DOption (d)

    Garbage value

View answer & explanation

Correct answer

Answer: (a)A.

15

Explanation not yet available.

Question 79

RRB JE 2026• Technical Abilities

Which of the following best describes packet switching in computer network?

  1. AOption (a)

    Dedicated physical path between sender and receiver

  2. BOption (b)

    Entire message transmitted as one continuous signal

  3. COption (c)

    Fixed bandwidth allocated permanently to users

  4. DOption (d)

    Data divided into smaller packets transmitted independently

View answer & explanation

Correct answer

Answer: (a)A.

Dedicated physical path between sender and receiver

Explanation not yet available.

Question 80

RRB JE 2026• Technical Abilities

Why is a high-sensitivity voltmeter preferred for accurate circuit measurements?

  1. AOption (a)

    It reduces the response time of the instrument

  2. BOption (b)

    It minimizes loading effect by drawing very small current

  3. COption (c)

    It increases the operating frequency of the circuit

  4. DOption (d)

    It increases the power consumption of the measuring circuit

View answer & explanation

Correct answer

Answer: (a)A.

It reduces the response time of the instrument

Explanation not yet available.
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