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Question 581

RRB JE 2026• Technical Abilities

An underground cable used in power systems should possess which important requirement?

  1. AOption (a)

    High insulation resistance and adequate mechanical strength properties

  2. BOption (b)

    Variable conductor diameter during balanced load operating conditions

  3. COption (c)

    Low melting point of conductor material during fault conditions

  4. DOption (d)

    High magnetic saturation capability inside cable conductor arrangements only

View answer & explanation

Correct answer

Answer: (a)A.

High insulation resistance and adequate mechanical strength properties

Explanation not yet available.

Question 582

RRB JE 2026• Technical Abilities

What is the main disadvantage of a half-wave rectifier?

  1. AOption (a)

    Utilizes only one half-cycle

  2. BOption (b)

    High cost

  3. COption (c)

    Requires center-tap transformer

  4. DOption (d)

    Ripple frequency equal to supply frequency

View answer & explanation

Correct answer

Answer: (a)A.

Utilizes only one half-cycle

Explanation not yet available.

Question 583

RRB JE 2026• Technical Abilities

Which of the following is used to join two cable conductors?

  1. AOption (a)

    Cable marking

  2. BOption (b)

    Insulation taping

  3. COption (c)

    Surface coating

  4. DOption (d)

    Splicing

View answer & explanation

Correct answer

Answer: (a)A.

Cable marking

Explanation not yet available.

Question 584

RRB JE 2026• Technical Abilities

In a DC generator, the magnitude of induced EMF is directly proportional to:

  1. AOption (a)

    the armature resistance

  2. BOption (b)

    the product of flux per pole and speed

  3. COption (c)

    the inverse of number of conductors

  4. DOption (d)

    the square of flux per pole

View answer & explanation

Correct answer

Answer: (a)A.

the armature resistance

Explanation not yet available.

Question 585

RRB JE 2026• Technical Abilities

Retentivity in a B-H curve indicates:

  1. AOption (a)

    Maximum field strength

  2. BOption (b)

    Reverse magnetic field required to reduce flux density to zero

  3. COption (c)

    Magnetic flux density left after removing the external magnetizing force

  4. DOption (d)

    Resistance to demagnetization

View answer & explanation

Correct answer

Answer: (a)A.

Maximum field strength

Explanation not yet available.

Question 586

RRB JE 2026• Technical Abilities

A power factor tariff is introduced in energy billing to encourage consumers to ________________.

  1. AOption (a)

    Receive discounts based only on total energy consumption

  2. BOption (b)

    Pay a fixed electricity charge regardless of usage pattern

  3. COption (c)

    Improve their power factor for more efficient use of electrical power

  4. DOption (d)

    Reduce electricity consumption during peak hours

View answer & explanation

Correct answer

Answer: (a)A.

Receive discounts based only on total energy consumption

Explanation not yet available.

Question 587

RRB JE 2026• Technical Abilities

In a buck-boost converter, how does the inductor contribute to the inversion of the input voltage polarity while regulating the output voltage?

  1. AOption (a)

    The inductor filters out high-frequency noise from the input supply.

  2. BOption (b)

    The inductor provides a low-impedance path for the return current.

  3. COption (c)

    The inductor stores energy from the input voltage and releases it in the opposite polarity during the 'off' phase of the switch.

  4. DOption (d)

    The inductor acts as a transformer to invert the voltage polarity.

View answer & explanation

Correct answer

Answer: (a)A.

The inductor filters out high-frequency noise from the input supply.

Explanation not yet available.

Question 588

RRB JE 2026• Technical Abilities

Which modification in an earthing system most directly reduces earth resistance by improving the contact area between the electrode and surrounding soil?

  1. AOption (a)

    Increasing the rating of the protective fuse

  2. BOption (b)

    Connecting the earth conductor to the neutral wire only

  3. COption (c)

    Using a higher supply voltage in the installation

  4. DOption (d)

    Increasing the effective contact area by using multiple or larger earth electrodes

View answer & explanation

Correct answer

Answer: (a)A.

Increasing the rating of the protective fuse

Explanation not yet available.

Question 589

RRB JE 2026• Technical Abilities

Two inductors of 8 H and 2 H connected in series opposing with mutual inductance of 1 H will have equivalent:

  1. AOption (a)

    11 H

  2. BOption (b)

    8 H

  3. COption (c)

    5 H

  4. DOption (d)

    9 H

View answer & explanation

Correct answer

Answer: (a)A.

11 H

Explanation not yet available.

Question 590

RRB JE 2026• Technical Abilities

When an alternator operates at unity power factor, the armature current:

  1. AOption (a)

    lags terminal voltage

  2. BOption (b)

    is in phase with terminal voltage

  3. COption (c)

    leads terminal voltage

  4. DOption (d)

    is opposite to terminal voltage

View answer & explanation

Correct answer

Answer: (a)A.

lags terminal voltage

Explanation not yet available.
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