Heat Transfer MCQs

Question 1

Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.

Accepted Answer

3 × 108

Answer

3 × 105

Answer

3 × 1010

Answer

3 × 1012

Question 2

Which of the following is generally considered as opaque surface towards radiations?

Accepted Answer

Both B and C

Answer

Gases

Answer

Solids

Answer

Liquids

Question 3

The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

Accepted Answer

Nu, Gz

Answer

Re.Gz

Answer

Nu, Pr

Answer

Nu, Pr, Re

Question 4

Heat transfer by __________ may not necessarily require the presence of a medium.

Accepted Answer

Radiation

Answer

Conduction

Answer

Natural convection

Answer

Forced convection

Question 5

Which is the most suitable for cold viscous feed?

Accepted Answer

Backward feed

Answer

Forward feed

Answer

Mixed feed

Answer

Parallel feed

Question 6

In a forward feed multiple effect evaporator unit

Accepted Answer

None of these

Answer

Viscosity of liquid is highest in first effect

Answer

Transfer from effect to effect is done by pumps

Answer

No pump is required to withdraw the product from the last effect

Question 7

In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used

Accepted Answer

In high range of temperature differences

Answer

In low range of temperature differences

Answer

Because of its low cost

Answer

To prevent corrosion of the tube bundles

Question 8

What is the unit of thermal conductivity?

Accepted Answer

Kcal/hr.m.°C

Answer

Kcal/hr.m2.°C

Answer

Kcal/hr.m

Answer

Kcal/hr.°C

Question 9

Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

Accepted Answer

P and S

Answer

P and Q

Answer

P and R

Answer

R and S