Multiple Choice Questions (MCQ) with answers on Refrigeration and Air conditioning
21-The process in winter air conditioning is
(A) Dehumidification
(B) Heating and humidification
(C) Humidification
(D) Cooling and dehumidification
22-A thermostatic expansion valve function with
(A) suction pressure
(B) discharge pressure
(C) discharge temperature
(D) suction temperature
23-The colour of the flame of halide torch in case of leakage of Freon refrigerant will change t:
(A) Purple
(B) Pink
(C) Bright green
(D) Blue
24-Liquid charged in thermostatic expansion valves sensing bulb is:
(A) alcohol
(B) same refrigerant
(C) mercury
(D) nitrogen
25-The oil used with 134A refrigerant is:
(A) Mineral oil
(B) Capilla D
(C) Polyol ester oil
(D) Lubricating oil
26-The difference between DBT and WBT is called:
(A) wet bulb depression
(B) dew point depression
(C) effective temperature
(D) adiabatic saturation temperature
27-A device which is used to find relative humidity:
(A) Pyrometer
(B) Anemometer
(C) Hydrometer
(D) Hygrometer
28-Which type of valve is used in a reciprocating refrigeration compressor?
(A) rotary valve
(B) poppet valve
(C) ring plate
(D) glob valve
29-The capacity of visible cooler is expressed in:
(A) cubic feet
(B) litres
(C) k.cal/TR
(D) tons of refrigeration
30-Chemical name of Freon 22 is
(A) Dichloro difluoro methane
(B) Monochloro difluoro methane
(C) Trichloro monofluoro methane
(D) Dichloro monofluoro methane
ANSWERS:
21-(B), 22-(A), 23-(C), 24-(B), 25-(C), 26-(A), 27-(D), 28-(B), 29-(B), 30-(B)