Heat Transfer MCQs

Question 1

In a shell and tube heat exchanger, square pitch compared to triangular pitch

Accepted Answer

Gives a higher shell side pressure drop

Answer

Gives a lower shell side pressure drop

Answer

Can pack more surface area into a shell of given diameter

Answer

Both (A) and (B)

Question 2

Air is best heated with steam in a heat exchanger of

Accepted Answer

Double pipe type with fin on air side

Answer

Plate type

Answer

Double pipe type with fin on steam side

Answer

Shell and tube type

Question 3

An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

Accepted Answer

4000

Answer

9000

Answer

4600

Answer

3000

Question 4

Use of transverse baffles in a shell and tube heat exchanger is done to increase the

Accepted Answer

All of the above

Answer

Rate of heat transfer

Answer

Flow velocity

Answer

Turbulence of shell side fluid

Question 5

Heat exchanger tubes are never made of

Accepted Answer

Lead

Answer

Plain carbon steel

Answer

Stainless steel

Answer

Copper

Question 6

Which of the following has the minimum absorptivity?

Accepted Answer

Aluminium foil

Answer

Coal dust

Answer

Refractory bricks

Answer

Iron plates

Question 7

The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.

Accepted Answer

Lower than

Answer

Greater than

Answer

Is same as

Answer

Half

Question 8

The driving potential for the crystal growth during crystallisation is the __________ of the solution.

Accepted Answer

Super-saturation

Answer

Concentration

Answer

Viscosity

Answer

Density

Question 9

For what value of Prandtl number, the Col-burn analogy is valid?

Accepted Answer

0.6 to 120

Answer

0.06 to 120

Answer

1 to 103

Answer

1 to 50