REFRIGERATION AND AIR CONDITIONING QUIZ

The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

25°C DBT and 100% RH

22°C DBT and 60% RH

25°C DBT and 40% RH

20°C DBT and 80% RH

TRUE ANSWER : ?
YOUR ANSWER : ?

In a refrigeration system, heat absorbed in comparison to heat rejected is

More

Less

Same

More for small capacity and less for high capacity

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In case of sensible cooling of air, the coil efficiency is given by

1 + B.P.F.

1 - B.P.F.

1/ B.P.F.

P.F. - 1

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In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

5.12

2.15

1

1.25

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YOUR ANSWER : ?

The evaporator used in household refrigerators is

Frosting evaporator

Defrosting evaporator

None of these

Non-frosting evaporator

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The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

Wet bulb temperature

None of these

Dew point temperature

Dry bulb temperature

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The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Condensation of the refrigerant vapour

Compression of the refrigerant vapour

Evaporation of the refrigerant liquid

Metering of the refrigerant liquid

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The sub-cooling in a refrigeration cycle

None of these

Decreases C.O.P.

Increases C.O.P.

Does not alter C.O.P.

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Critical pressure of a liquid is the pressure

Above which liquid becomes solid

Above which liquid becomes gas

Above which liquid becomes vapour

Above which liquid will remain liquid

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In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

Superheat the vapour

Collect liquid refrigerant and prevent it from going to compressor

Collect vapours

Detect liquid in vapour

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