CHEMICAL ENGINEERING

Question: According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.
[A].

0.5

[B].

2

[C].

2

[D].

3/2

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.
[A].

supercharging

[B].

wall temperature

[C].

compression ratio

[D].

engine speed

Answer: Option D

Explanation:

No answer description available for this question.

Question: For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.
[A].

heat rejection is lower.

[B].

expansion & compression are isentropic.

[C].

maximum temperature is higher.

[D].

combustion is at constant volume.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Expansion device used in a window air-conditioner is a/an
[A].

automatic expansion valve.

[B].

thermostatic expansion valve.

[C].

float valve.

[D].

capillary tube.

Answer: Option D

Explanation:

No answer description available for this question.

Question: In chemical dehumidification of air
[A].

both specific humidity & dry bulb temperature increases.

[B].

both specific humidity & dry bulb temperature decreases.

[C].

specific humidity decreases & dry bulb temperature increases.

[D].

specific humidity increases & dry bulb temperature decreases.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Coating provided on the electrodes used in the arc welding is not expected to
[A].

add alloying elements.

[B].

prevent electrode from contamination.

[C].

stabilise the arc.

[D].

provide protective atmosphere to weld.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Disposable patterns are made of
[A].

metal

[B].

polystyrene

[C].

rubber

[D].

wood

Answer: Option B

Explanation:

No answer description available for this question.

Question: Ferrites are __________ magnetic.
[A].

anti

[B].

para

[C].

ferri

[D].

ferro

Answer: Option C

Explanation:

No answer description available for this question.

Question: Wood is a/an __________ material.
[A].

amorphous

[B].

cellular

[C].

homogeneous

[D].

grannular

Answer: Option B

Explanation:

No answer description available for this question.

Question: Out of the following, the alloy which has equal percentage of constituents, is
[A].

white metal

[B].

gun metal

[C].

duralumin

[D].

constanton

Answer: Option D

Explanation:

No answer description available for this question.