REFRIGERATION AND AIR CONDITIONING QUIZ

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

Very wet vapour

Dry vapour

High pressure saturated liquid

Wet vapour

TRUE ANSWER : ?
YOUR ANSWER : ?

Most of the domestic refrigerators work on the following refrigeration system

Electrolux refrigerator

Vapour compression

Carnot cycle

Vapour absorption

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Dry bulb temperature

Dew point temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with water vapour and cause acid rain

These react with plants and cause greenhouse effect

These react with oxygen and cause its depletion

These react with ozone layer

TRUE ANSWER : ?
YOUR ANSWER : ?

Air conditioning means

Heating

All of these

Cooling

Dehumidifying

TRUE ANSWER : ?
YOUR ANSWER : ?

For unsaturated air, the dew point temperature is __________ wet bulb temperature.

None of these

Less than

Equal to

More than

TRUE ANSWER : ?
YOUR ANSWER : ?

Reducing suction pressure in refrigeration cycle

Increases power required per ton of refrigeration

Lowers compressor capacity because vapour is lighter

All of these

Lowers evaporation temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system

Strong solution to weak solution

Strong solution to ammonia vapour

Weak solution to strong solution

Ammonia vapours to weak solution

TRUE ANSWER : ?
YOUR ANSWER : ?

The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

(hA - h1)/ (h2 - h1)

(h1 - h2)/ (hA - h2)

(hA - h2)/ (h1 - h2)

(h2 - hA)/ (h1 - h2)

TRUE ANSWER : ?
YOUR ANSWER : ?

During heating and humidification, the final relative humidity of air

Can be lower or higher than that of the entering air

Is higher than that of the entering air

None of the listed here

Is lower than that of the entering air

TRUE ANSWER : ?
YOUR ANSWER : ?

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