Heat Transfer MCQs

Question 1

Thermal conductivities of most of the liquids __________ with rise in temperature.

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unchanged

Answer

May increase or decrease; depends on the liquid

Question 2

The equivalent diameter for pressure drop is __________ that for heat transfer.

Accepted Answer

Smaller than

Answer

Greater than

Answer

Equal to

Answer

Not related with

Question 3

In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.

Accepted Answer

Increases

Answer

Decreases

Answer

Does not affect

Answer

May increase or decrease, depends on the type of baffle

Question 4

Radiator of an automobile engine is a __________ type of heat exchanger.

Accepted Answer

Counter-current

Answer

Co-current

Answer

Cross-current

Answer

Direct contact

Question 5

Trap is used to remove __________ from steam pipe lines.

Accepted Answer

Condensate

Answer

Steam

Answer

Non-condensables

Answer

None of these

Question 6

A graph between __________ is called Wilson plot.

Accepted Answer

$$\frac{1}{{	ext{U}}}{	ext{Vs}}.\frac{1}{{{{	ext{v}}^{0.8}}}}$$

Answer

$$\frac{1}{{{{	ext{v}}^{0.8}}}}{	ext{Vs}}.{	ext{U}}$$

Answer

$${{	ext{v}}^{0.8}}{	ext{Vs}}.{	ext{U}}$$

Answer

$$\frac{1}{{	ext{U}}}{	ext{Vs}}.\frac{1}{{	ext{V}}}$$

Question 7

At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Accepted Answer

Decrease

Answer

Increase

Answer

Remain unchanged

Answer

May increase or decrease; depends on the pressure

Question 8

Pick out the wrong statement.

Accepted Answer

Swenson-Walker crystalliser is a batch crystalliser

Answer

Super saturation of the solution is the driving potential for a crystal growth

Answer

The liquor left after the removal of crystals from a solution is called mother liquor

Answer

The first stage of crystal formation is called nucleation

Question 9

The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Accepted Answer

Entrainment separator

Answer

Steam ejector

Answer

Compressor

Answer

Vacuum pump