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Question 131

RRB JE 2026• Technical Abilities

How does the shading coil in an AC relay minimize contact chatter during operation?

  1. AOption (a)

    It delays the movement of the relay armature during release.

  2. BOption (b)

    It maintains a holding magnetic force during current zero crossing.

  3. COption (c)

    It changes the relay's operating voltage rating.

  4. DOption (d)

    It maintains the spacing between relay contacts during operation.

View answer & explanation

Correct answer

Answer: (a)A.

It delays the movement of the relay armature during release.

Explanation not yet available.

Question 132

RRB JE 2026• Technical Abilities

The transition of an SCR from the forward blocking state to the conduction state is called:

  1. AOption (a)

    Commutation

  2. BOption (b)

    Forward recovery

  3. COption (c)

    Avalanche breakdown

  4. DOption (d)

    Triggering

View answer & explanation

Correct answer

Answer: (a)A.

Commutation

Explanation not yet available.

Question 133

RRB JE 2026• Technical Abilities

What does the remanence (Br) indicate in a magnetic hysteresis loop?

  1. AOption (a)

    It is the maximum magnetic flux density reached in the loop.

  2. BOption (b)

    It is the residual magnetic flux density after removing the applied field.

  3. COption (c)

    It is the applied field needed to reduce flux to zero.

  4. DOption (d)

    It is the area enclosed by the hysteresis loop.

View answer & explanation

Correct answer

Answer: (a)A.

It is the maximum magnetic flux density reached in the loop.

Explanation not yet available.

Question 134

RRB JE 2026• Technical Abilities

Why does charging a lead-acid secondary cell increase the specific gravity of the electrolyte?

  1. AOption (a)

    It increases due to hydrogen gas raising electrolyte density

  2. BOption (b)

    Active materials reform and increase acid concentration

  3. COption (c)

    It stays the same because separators control dilution

  4. DOption (d)

    It decreases due to formation of water from hydrogen and oxygen

View answer & explanation

Correct answer

Answer: (a)A.

It increases due to hydrogen gas raising electrolyte density

Explanation not yet available.

Question 135

RRB JE 2026• Technical Abilities

Consider an abrupt p-n junction under thermal equilibrium. If the acceptor doping concentration (NA) in the p-region is made significantly larger than the donor doping concentration (ND) in the n-region (i.e., NA ≫ ND), how is the depletion region physically distributed?

  1. AOption (a)

    It is confined strictly to the metallurgical junction with zero penetration into either region.

  2. BOption (b)

    It extends primarily into the lightly doped n-type region.

  3. COption (c)

    It extends primarily into the heavily doped p-type region.

  4. DOption (d)

    It extends equally into both the p-type and n-type regions.

View answer & explanation

Correct answer

Answer: (a)A.

It is confined strictly to the metallurgical junction with zero penetration into either region.

Explanation not yet available.

Question 136

RRB JE 2026• Technical Abilities

A DC node has 1.8 A entering it. Two branches carry 0.6 A and 0.9 A away from the node. Assuming the remaining branch current is also leaving the node, what is its value?

  1. AOption (a)

    0.5 A

  2. BOption (b)

    0.9 A

  3. COption (c)

    1.2 A

  4. DOption (d)

    0.3 A

View answer & explanation

Correct answer

Answer: (a)A.

0.5 A

Explanation not yet available.

Question 137

RRB JE 2026• Technical Abilities

A technician is troubleshooting a circuit where the fuse does not blow during an overcurrent fault. What is the most likely cause?

  1. AOption (a)

    The fuse is installed after the protective relay.

  2. BOption (b)

    The fuse rating is higher than the circuit's safe current.

  3. COption (c)

    The fuse wire has low resistance

  4. DOption (d)

    The fuse is connected in parallel with the load.

View answer & explanation

Correct answer

Answer: (a)A.

The fuse is installed after the protective relay.

Explanation not yet available.

Question 138

RRB JE 2026• Technical Abilities

Which mechanical property allows a conductor to be drawn into thin wires without breaking?

  1. AOption (a)

    Ductility

  2. BOption (b)

    Brittleness

  3. COption (c)

    Elasticity

  4. DOption (d)

    Hardness

View answer & explanation

Correct answer

Answer: (a)A.

Ductility

Explanation not yet available.

Question 139

RRB JE 2026• Technical Abilities

What is the output of the following C programming language code?#includeint main(){ int x = 10; int *p = &x; *p = *p + 5; printf("%d %d", x, *p); return 0;}

  1. AOption (a)

    10 15

  2. BOption (b)

    15 15

  3. COption (c)

    15 10

  4. DOption (d)

    10 10

View answer & explanation

Correct answer

Answer: (a)A.

10 15

Explanation not yet available.

Question 140

RRB JE 2026• Technical Abilities

What happens to the amount of substance deposited if the time for which current flows through an electrolyte is doubled?

  1. AOption (a)

    It remains unchanged

  2. BOption (b)

    It becomes half

  3. COption (c)

    It becomes zero

  4. DOption (d)

    It also doubles

View answer & explanation

Correct answer

Answer: (a)A.

It remains unchanged

Explanation not yet available.
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