Heat Transfer MCQs

Question 1

In a forward feed multiple effect evaporator, the pressure is

Accepted Answer

Lowest in last effect

Answer

Highest in last effect

Answer

Same in all effects

Answer

Dependent on the number of effects

Question 2

Heat produced when a steady state current, $$I$$ passes through an electrical conductor having resistance, 'R' is

Accepted Answer

$${I^2}{	ext{R}}$$

Answer

$$I{	ext{R}}$$

Answer

$$I{{	ext{R}}^2}$$

Answer

$${I^2}{{	ext{R}}^2}$$

Question 3

In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.

Accepted Answer

Logarithmic

Answer

Geometric

Answer

Arithmetic

Answer

Either A, B or C

Question 4

The most conducive surface for dropwise condensation to occur is the __________ surface.

Accepted Answer

Oily

Answer

Coated

Answer

Glazed & polished

Answer

Smooth

Question 5

The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Accepted Answer

Heat flux

Answer

Nusselt number

Answer

Prandtl number

Answer

Schmidt number

Question 6

Correction is applied to LMTD for __________ flow.

Accepted Answer

Cross

Answer

Parallel

Answer

Counter

Answer

None of these

Question 7

The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

Accepted Answer

0.5-50

Answer

0.38-0.78

Answer

100-1000

Answer

5-50

Question 8

A black body does not __________ radiation.

Accepted Answer

Both B & C

Answer

Absorb or emit

Answer

Refract

Answer

Reflect

Question 9

Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?

Accepted Answer

Triangular pitch

Answer

Square pitch

Answer

Diagonal square pitch

Answer

None of these