Multiple Choice Questions (MCQ) with answers on Refrigeration and Air conditioning
1-During which component of vapour compression refrigeration system, the enthalpy remains constant:
(A) Evaporator
(B) Compressor
(C) Throttle valve
(D) None
2-Which one of the following is a CFC refrigerant?
(A) R 744
(B) R 290
(C) R 502
(D) R 718
3-In sensible cooling process the relative humidity:
(A) decreases
(B) increases
(C) remains constant
(D) none of the above
4-In psychrometric chart, dew point temperature lines are
(A) horizontal
(B) vertical
(C) curved
(D) straight lines slopping downwards to the right
5-In psychrometric chart, specific humidity lines are:
(A) vertical
(B) horizontal
(C) inclined
(D) curved lines
6-Commonly used refrigerant in commercial ice plant is
(A) CO2
(B) Freon 12
(C) Ammonia
(D) Air
7-Accumulator is provided for
(A) Storing of liquid refrigerant
(B) exchange of heat
(C) storing of unvaporized liquid
(D) condensing gas
8-Oil separator if fitted in between
(A) Condenser and evaporator
(B) On the suction line
(C) compressor and condenser
(D) at the receiver outlet
9-An air washer can work as:
(A) Humidifier
(B) Dehumidifier
(C) Filter
(D) All of the above
10-Sling psychrometer is used to measure
(A) only dry bulb temperature
(B) only wet bulb temperature
(C) dry and wet bulb temperature
(D) relative humidity
ANSWERS:
1-(C), 2-(C), 3-(B), 4-(A), 5-(B), 6-(C), 7-(A), 8-(C), 9-(D), 10-(C)