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Question 401

RRB JE 2026• Technical Abilities

A hollow shaft is designed to transmit a torque of 40000 N-m. The polar moment of inertia (J) is 0.004 m4. The ratio of inside diameter to outside diameter of the hollow shaft (Di/Do) is 0.8. The inside diameter is 400 mm. What is the maximum induced shear stress (tmax) at the outer fiber of the shaft?

  1. AOption (a)

    0.25 MPa

  2. BOption (b)

    2.5 MPa

  3. COption (c)

    2500 MPa

  4. DOption (d)

    250 MPa

View answer & explanation

Correct answer

Answer: (a)A.

0.25 MPa

Explanation not yet available.

Question 402

RRB JE 2026• Technical Abilities

Which of the following can be measured using interferometry?

  1. AOption (a)

    Surface roughness

  2. BOption (b)

    Depth of micro‑grooves

  3. COption (c)

    Frequency of vibration

  4. DOption (d)

    Linear displacement

View answer & explanation

Correct answer

Answer: (a)A.

Surface roughness

Explanation not yet available.

Question 403

RRB JE 2026• Technical Abilities

What is the heat supplied to a Carnot engine that produces 100 kW of useful work at an efficiency of 35%?

  1. AOption (a)

    300 kW

  2. BOption (b)

    285.7 kW

  3. COption (c)

    150 kW

  4. DOption (d)

    200 kW

View answer & explanation

Correct answer

Answer: (a)A.

300 kW

Explanation not yet available.

Question 404

RRB JE 2026• Technical Abilities

With an increase in angle of the inclined surface, the maximum angle at which a body starts sliding down the plane is called ___________.

  1. AOption (a)

    limiting friction

  2. BOption (b)

    Static friction

  3. COption (c)

    angle of friction

  4. DOption (d)

    cone angle

View answer & explanation

Correct answer

Answer: (a)A.

limiting friction

Explanation not yet available.

Question 405

RRB JE 2026• Technical Abilities

A technician wants to improve flatness and surface quality of a gauge block using lapping. What is the most important factor to control?

  1. AOption (a)

    High temperature and fast lap speed

  2. BOption (b)

    Applying excessive force to speed up lapping

  3. COption (c)

    Uniform pressure and movement across the surface

  4. DOption (d)

    Using coarse abrasives for faster removal

View answer & explanation

Correct answer

Answer: (a)A.

High temperature and fast lap speed

Explanation not yet available.

Question 406

RRB JE 2026• Technical Abilities

If the electrolyte does not contain metal ions of the plating metal, what is the most likely outcome?

  1. AOption (a)

    The anode will become coated with metal

  2. BOption (b)

    No metal will deposit on the cathode

  3. COption (c)

    The cathode will dissolve in the solution

  4. DOption (d)

    The process will create a thick oxide layer

View answer & explanation

Correct answer

Answer: (a)A.

The anode will become coated with metal

Explanation not yet available.

Question 407

RRB JE 2026• Technical Abilities

Why is direct current (DC) commonly used in MIG (metal inert gas) welding?

  1. AOption (a)

    It reduces penetration for thick materials

  2. BOption (b)

    It increases spatter for faster welding

  3. COption (c)

    It limits the types of metals that can be welded

  4. DOption (d)

    It offers a stable arc and consistent metal transfer

View answer & explanation

Correct answer

Answer: (a)A.

It reduces penetration for thick materials

Explanation not yet available.

Question 408

RRB JE 2026• Technical Abilities

Which of the following best describes the function of a hoist in material handling systems?

  1. AOption (a)

    Lifting and lowering loads vertically with controlled movement

  2. BOption (b)

    Rotating loads for alignment during material handling

  3. COption (c)

    Moving loads horizontally between different workstations

  4. DOption (d)

    Sorting materials by size during material handling

View answer & explanation

Correct answer

Answer: (a)A.

Lifting and lowering loads vertically with controlled movement

Explanation not yet available.

Question 409

RRB JE 2026• Technical Abilities

Which manufacturing method is primarily used to harden and set silicate-bonded grinding wheels?

  1. AOption (a)

    High-pressure forging of abrasive particles

  2. BOption (b)

    Controlled firing at moderate temperature

  3. COption (c)

    Low-temperature drying without firing

  4. DOption (d)

    Chemical polymerization at room temperature

View answer & explanation

Correct answer

Answer: (a)A.

High-pressure forging of abrasive particles

Explanation not yet available.

Question 410

RRB JE 2026• Technical Abilities

When a mild steel bar is loaded in tension within the elastic limit, the relation between stress and strain is:

  1. AOption (a)

    Stress ∝ Strain

  2. BOption (b)

    Stress independent of strain

  3. COption (c)

    Stress ∝ √(Strain)

  4. DOption (d)

    Stress ∝ (Strain)2

View answer & explanation

Correct answer

Answer: (a)A.

Stress ∝ Strain

Explanation not yet available.
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