Refrigeration and Air conditioning Mcqs Archives

The freezing point of ammonia is

August 1, 2023 BILAL KHATTAK0

A.0?C
B.? 20?C
C.? 77.8?C
D.? 132.5?C
E.? 202.5?C

Moisture in Freon refrigeration system causes

July 30, 2023 BILAL KHATTAK0

A.Ineffective refrigeration
B.Damage to compressor
C.High power consumption
D.Freezing of automatic regulating valve
E.None of the above

A refrigerating machine working on Reversed Carnot cycle takes out 2 kW per minute of heat from the system while working between temperature limits of 300?K and 200?K. The C.O.P. and power consumed by the cycle will be

February 3, 2020 BILAL KHATTAK0

A.1,1 kW
B.1, 2 kW
C.2. 1 kW
D.2, 2 kW
E.0, 0 kW

Hydrogen cannot be liquefied at room temperature by the application of pressure, because

January 31, 2020 BILAL KHATTAK0

A.It has low density
B.It has high viscosity
C.Its thermal conductivity is high
D.It is a diatomic molecule
E.Its critical temperature is lower than the normal room temperature

Out of the following refrigerants which one will provide highest compressor displacement per tonne of refrigeration in a vapour compression system operating between fixed temperatures

January 31, 2020 BILAL KHATTAK0

A.Ammonia
B.Freon 11
C.Freon 12
D.Freon 22
E.Carbondioxide

Dry bulb temperature depends on

January 23, 2020 BILAL KHATTAK0

A.Humidity of air
B.Water vapour content of air
C.Condition of air
D.All above
E.None of the above

The ratio of sensible heat to total heat is known as

January 22, 2020 BILAL KHATTAK0

A.Dew point
B.Humidification ratio
C.Relative humidity
D.Specific humidity
E.Sensible heat factor

An average adult while sitting in a cinema hall

January 21, 2020 BILAL KHATTAK0

A.Absorbs about 100 kcal of heat per hour
B.Absorbs about 500 kcal of heat per hour
C.Discards about 500 kcal of heat per hour
D.Discharges about 100 kcal of heat per hour
E.Neither absorbs nor discards heat