August 2022

Question: If a heat transfer surface is pock-marked with a number of cavities, then as compared to a smooth surface the heat transfer by __________ will not increase.
[A].

convection

[B].

nucleate boiling

[C].

radiation

[D].

conduction

Answer: Option A

Explanation:

No answer description available for this question.

Question: “‘Dikes’ are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel)
[A].

V

[B].

V/2

[C].

2V

[D].

3V

Answer: Option A

Explanation:

No answer description available for this question.

Question: Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
[A].

H

[B].

H/2

[C].

H/4

[D].

H/6

Answer: Option D

Explanation:

No answer description available for this question.

Question: As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
[A].

110

[B].

85

[C].

60

[D].

45

Answer: Option B

Explanation:

No answer description available for this question.

Question: A solar cell converts the sunlight directly into __________ energy.
[A].

thermal

[B].

electrical

[C].

mechanical

[D].

chemical

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
[A].

23

[B].

23/2

[C].

25/2

[D].

21/3

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.
[A].

Vaneering

[B].

Galvanising

[C].

Electroplating

[D].

Calorising

Answer: Option D

Explanation:

No answer description available for this question.

Question: Maximum permissible air velocity in pipelines is about __________ metre/second.
[A].

5

[B].

10

[C].

20

[D].

40

Answer: Option B

Explanation:

No answer description available for this question.

Question: Electrometallurgy is not involved in the extraction of __________ from its ore.
[A].

aluminium

[B].

tin

[C].

lead

[D].

both(b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
[A].

cheap electricity is available.

[B].

the precious metal content of copper is high.

[C].

there is a demand for ultrapure (99.99%) electrolytic copper.

[D].

all (a), (b) & (c).

Answer: Option D

Explanation:

No answer description available for this question.