Heat Transfer MCQs

Question 1

An ejector is used to

Accepted Answer

None of these

Answer

Increase pressure

Answer

Increase temperature

Answer

Remove condensate

Question 2

An insulator should have

Accepted Answer

Low thermal conductivity

Answer

High thermal conductivity

Answer

Less resistance to heat flow

Answer

A porous structure

Question 3

Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

Accepted Answer

None of these

Answer

Baffle spacing & shell diameter

Answer

Tube diameter & pitch

Answer

Viscosity, density & mass velocity of shell side fluid

Question 4

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Accepted Answer

All of the above

Answer

Occupies smaller space

Answer

Is more economical

Answer

Is easy to operate and maintain

Question 5

In a heat exchanger, one transfer unit means

Accepted Answer

A section of the exchanger in which change in temperature of one stream equals the average driving force in the section

Answer

The size of the exchanger in which heat transfer rate is 1 kcal/hr

Answer

Both A and B

Answer

None of these

Question 6

When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

Accepted Answer

At high fluid velocity

Answer

At low velocity

Answer

When fluid flows past a smooth surface

Answer

None of these

Question 7

__________ chart is known as transient heat conduction chart.

Accepted Answer

Heisler's

Answer

Dirhing's

Answer

Mollier's

Answer

Cox

Question 8

It is not preferable to use superheated steam in evaporators, because of its very

Accepted Answer

Low film co-efficient

Answer

High temperature

Answer

High pressure

Answer

None of these

Question 9

Vent pipes are provided in a condenser to

Accepted Answer

Remove non-condensable gases

Answer

Purge the condenser

Answer

Facilitate easy cleaning of tubes

Answer

None of these