Under increased atmospheric pressure (as compared to the standard conditions) the steam will condense at
A.More than 100?C
B.100?C
C.Less than 100?C
D.Has nothing to do with pressure
E.Depends on other conditions
Category: Refrigeration and Air conditioning Mcqs
A critical temperature is the temperature
A.Below which gas is always liquefied
B.Above which a gas will never be liquefied
C.Below which a gas does not obey gas laws
D.Above which a gas may explode
E.None of the above
In order to ensure leak proof mechanical links, the end of copper tubing in refrigeration cycle is
A.Flared
B.Brazed
C.Soldered
D.Press-fitted
E.(C) and (D) together
In vapour compression cycle the highest temperature of the refrigerant during the cycle occurs
A.After expansion valve
B.After evaporator
C.After condenser
D.After compression
E.None of the above
The critical pressure of a liquid is the pressure
A.Below which a liquid will always be in vapour form
B.Above which a liquid will remain a liquid
C.Above which a liquid will always turn into a vapour
D.Above which a liquid will explode
E.None of the above
A device designed to remove moisture from a refrigerant is called
A.Expansion valve
B.Dehumidifier
C.Drier
D.Solenoid
E.Humidstat
In a vapour absorption system as compared to vapour compression system, the compressor is replaced by
A.Evaporator
B.Receiver
C.Expansion valve
D.Conderser
E.Absorber and generator
No refrigerator using reversed Carnot cycle has been constructed because
A.It is less efficient
B.It requires bulky machines
C.It is uneconomical
D.Isentropic portions of cycle require low speeds whereas isothermal protuons require high speeds
One tonne of refrigeration is equivalent to SI units of
A.1 kW
B.2.5 kW
C.3.5 kW
D.5 kW
E.10 kW
In a newly charged ammonia compression system, the clicking sound in the expansion valve indicates
A.High pressure after compression
B.Excessive ammonia charged
C.Lack of ammonia
D.Evaporator coils chocked
E.Leakage of ammonia
