HEAT TRANSFER QUIZ

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf could be greater or smaller than hd

hf > hd

hf = hd

hf < hd

TRUE ANSWER : ?
YOUR ANSWER : ?

The purpose of providing bleed points in the evaporator is to

Facilitate removal of non-condensable gases

Admit the feed

Remove the product

Create vacuum

TRUE ANSWER : ?
YOUR ANSWER : ?

The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.

Colburn

Prandtl

Reynolds

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

Bleed point

Vent

Catchall

Baffle

TRUE ANSWER : ?
YOUR ANSWER : ?

Film boiling occurs at __________ pressure.

none of the listed here

negative

very high

atmospheric

TRUE ANSWER : ?
YOUR ANSWER : ?

Analogy between mass and heat transfer is not applicable in case of

Thermal or pressure mass diffusion

Viscous heating or chemical reaction

Both B and C

Same velocity profile or equal eddy diffusivities

TRUE ANSWER : ?
YOUR ANSWER : ?

Multipass heat exchangers are used

To reduce the pressure drop

For low heat load

To obtain higher heat transfer co-efficient and shorter tube

Because of simplicity of fabrication

TRUE ANSWER : ?
YOUR ANSWER : ?

Kg of liquid evaporated per hour in an evaporator is defined as its

Steam load

Economy

None of these

Capacity

TRUE ANSWER : ?
YOUR ANSWER : ?

A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

More space

Lower maintenance cost

Less heating surface

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

An ejector is used to

None of these

Remove condensate

Increase temperature

Increase pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

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