REFRIGERATION AND AIR CONDITIONING QUIZ

Superheating in a refrigeration cycle

Decreases C.O.P

O.P remains unaltered

Increases C.O.P

Other factors decide C.O.P

TRUE ANSWER : ?
YOUR ANSWER : ?

The vapour compression refrigerator employs the following cycle

Carnot

Rankine

Reversed Carnot

Reversed Rankine

TRUE ANSWER : ?
YOUR ANSWER : ?

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

depends on other factors

increases

remains same

decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

Zero

100

20

50

TRUE ANSWER : ?
YOUR ANSWER : ?

The lowest thermal diffusivity is of

Iron

Rubber

Lead

Aluminium

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a desirable property of a refrigerant?

Large latent heat

High risibility with oil

Low boiling point

Good electrical conductor

TRUE ANSWER : ?
YOUR ANSWER : ?

Formation of frost on evaporator in refrigerator

Can be avoided by proper design

Is immaterial

Increases heat transfer rate

Results in loss of heat due to poor heat transfer

TRUE ANSWER : ?
YOUR ANSWER : ?

In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is

Very wet vapour

Dry vapour

Wet vapour

High pressure saturated liquid

TRUE ANSWER : ?
YOUR ANSWER : ?

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Carbon dioxide

Ammonia

Freon

Brine

TRUE ANSWER : ?
YOUR ANSWER : ?

The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

Higher than

Lower than

Same as

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

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