Questions and answers for exam Preparation

MCQs

Total Questions : 1628 | Page 24 of 163 pages

Question 231. With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will

Increase
Decrease
Remain unaffected
Increase or decrease depending on the nature of the dust

Discuss Question

Answer: Option A. -> Increase

Question 232. LMTD correction factor is used in heat exchanger design for

Double pipe heat exchanger
Multipass shell and tube heat exchanger
Fouling fluids
Counter flow of hot and cold fluids

Discuss Question

Answer: Option B. -> Multipass shell and tube heat exchanger

Question 233. Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.

Less
More
Same
Either A or B; no generalisation can be made

Discuss Question

Answer: Option B. -> More

Question 234. Pick out the wrong statement

In a flanged and standard dished head, the crown radius is ≤ shell outside diameter
In a flanged and shallow dished head, the crown radius is > shell outside diameter
Flat head covers are most suitable for larger vessels operating at very high pressure
Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses

Discuss Question

Answer: Option C. -> Flat head covers are most suitable for larger vessels operating at very high pressure

Question 235. At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure

Increases
Decreases
Remains same
May increase or decrease depending upon the solubility of the gas in the liquid

Discuss Question

Answer: Option C. -> Remains same

Question 236. The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations.

0.3 to 0.8
1.25 to 3.125
3.5 to 7.0
8-12

Discuss Question

Answer: Option B. -> 1.25 to 3.125

Question 237. The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.