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Question 381

RRB JE 2026• Technical Abilities

Mild steel shows poor corrosion resistance mainly because it:

  1. AOption (a)

    Does not contain protective elements like chromium or nickel

  2. BOption (b)

    Possesses a non-uniform and less stable microstructure

  3. COption (c)

    Forms a dense but non-protective oxide layer on the surface

  4. DOption (d)

    Contains a relatively high amount of carbon

View answer & explanation

Correct answer

Answer: (a)A.

Does not contain protective elements like chromium or nickel

Explanation not yet available.

Question 382

RRB JE 2026• Technical Abilities

In high-performance applications such as turbine shafts and precision gears, alloy steels are favored over mild steels primarily because they:

  1. AOption (a)

    Require less alloying and heat treatment to achieve desired strength

  2. BOption (b)

    Possess lower density and improved dimensional stability

  3. COption (c)

    Retain mechanical integrity and hardness under conditions of elevated temperature and cyclic stress

  4. DOption (d)

    Exhibit superior machinability due to refined ferritic microstructure

View answer & explanation

Correct answer

Answer: (a)A.

Require less alloying and heat treatment to achieve desired strength

Explanation not yet available.

Question 383

RRB JE 2026• Technical Abilities

What type of efficiency is most important for an axial flow compressor in high-speed applications?

  1. AOption (a)

    Mechanical efficiency

  2. BOption (b)

    Isentropic efficiency

  3. COption (c)

    Volumetric efficiency

  4. DOption (d)

    Thermal efficiency

View answer & explanation

Correct answer

Answer: (a)A.

Mechanical efficiency

Explanation not yet available.

Question 384

RRB JE 2026• Technical Abilities

The functioning of a comparator is based on:

  1. AOption (a)

    The use of limit gauges

  2. BOption (b)

    Comparison with a known standard, such as slip gauges

  3. COption (c)

    An optical measuring system

  4. DOption (d)

    The use of an accurately calibrated scale

View answer & explanation

Correct answer

Answer: (a)A.

The use of limit gauges

Explanation not yet available.

Question 385

RRB JE 2026• Technical Abilities

The horizontal and vertical components of a 100 N force inclined at 37° with the horizontal are: (consider the approximation of sin 37°=0.6, cos 37°=0.8 and tan 37°=0.75)

  1. AOption (a)

    100 N and 0 N

  2. BOption (b)

    60 N and 80 N

  3. COption (c)

    80 N and 60 N

  4. DOption (d)

    70 N and 70 N

View answer & explanation

Correct answer

Answer: (a)A.

100 N and 0 N

Explanation not yet available.

Question 386

RRB JE 2026• Technical Abilities

A company faces an annual demand of 10,000 units, a fixed ordering cost of ₹200 per order, and a holding cost of ₹4 per unit per year. What is the EOQ for this company?

  1. AOption (a)

    The EOQ is 4000 units

  2. BOption (b)

    The EOQ is 2240 units

  3. COption (c)

    The EOQ is 1000 units

  4. DOption (d)

    The EOQ is 5000 units

View answer & explanation

Correct answer

Answer: (a)A.

The EOQ is 4000 units

Explanation not yet available.

Question 387

RRB JE 2026• Technical Abilities

The ideal gas law for isothermal process can be represented as ______, (P is the pressure and V is the volume of the gas at any stage).

  1. AOption (a)

    P/V = Constant.

  2. BOption (b)

    V = constant.

  3. COption (c)

    PV = Constant.

  4. DOption (d)

    P = constant.

View answer & explanation

Correct answer

Answer: (a)A.

P/V = Constant.

Explanation not yet available.

Question 388

RRB JE 2026• Technical Abilities

You must inspect a welded aluminum structure for both surface and internal defects with minimal health risk to operators. Which combination of tests is most appropriate?

  1. AOption (a)

    Dye penetrant and ultrasonic testing

  2. BOption (b)

    Radiographic and magnetic particle testing

  3. COption (c)

    Radiographic and ultrasonic testing

  4. DOption (d)

    Visual and magnetic particle testing

View answer & explanation

Correct answer

Answer: (a)A.

Dye penetrant and ultrasonic testing

Explanation not yet available.

Question 389

RRB JE 2026• Technical Abilities

The primary function of a sine bar is to:

  1. AOption (a)

    check thread pitches

  2. BOption (b)

    calibrate pressure gauges

  3. COption (c)

    measure angles with high accuracy

  4. DOption (d)

    measure linear dimensions

View answer & explanation

Correct answer

Answer: (a)A.

check thread pitches

Explanation not yet available.

Question 390

RRB JE 2026• Technical Abilities

How do the gear mechanism and braking system in a hoist contribute to safe lifting operations?

  1. AOption (a)

    The gear mechanism reduces speed while the brake system holds the load steady

  2. BOption (b)

    Both gear mechanism and brake system work only during lowering of load

  3. COption (c)

    The brake system increases speed and the gear mechanism holds the load steady

  4. DOption (d)

    The gear mechanism increases speed and the brake system adds force to lifting

View answer & explanation

Correct answer

Answer: (a)A.

The gear mechanism reduces speed while the brake system holds the load steady

Explanation not yet available.
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