Top 250+ Solved Refrigeration and Air conditioning MCQ Questions Answer
Q. In a vapour compression cycle the vapour as it leaves the compressor is
a. In liquid form
b. Wet vapour
c. Dry vapour
d. Dry and saturated vapour
e. None of the above
Q. In a domestic refrigerator if the compressor runs continuously, it shows that
a. The system is working perfectly all right
b. The refrigeration is to full capacity
c. The system is overloaded
d. Any of the above
e. None of the above
Q. The ability of an evaporator to absorb heat does not depends on
a. Temperature difference between the evaporator and the surrounding air
b. Its size, surface condition and material
c. Kind of refrigerant used
d. Velocity of turbulence
e. Compressor speed
Q. In case of freon as refrigerant the pipe lines should be of
a. Copper
b. Brass
c. Seamless steel tubes
d. Stainless steel tubes
e. None of the above
Q. When Freon 12 is used as a refrigerant in vapour compression cycle, the mass circulated per ton of refrigerating effect will be nearly
a. 1.8 kg
b. 0.5 kg
c. 12 kg
d. 1 kg
e. 0.2 kg
Q. In control cooling water system, chromates, phosphates and silicates are added to water
a. To remove odour
b. To increase remove foreign particle
c. To inhibit corrosion
d. To prevent scale formation
e. To prevent algae growth
Q. In a psychrometric chart horizontal line indicate
a. Percentage humidity
b. Dew point temperature
c. Wet bulb temperature
d. Relative humidity
e. Dry bulb temperature
Q. In a mechanical refrigeration system the highest temperature of refrigerant occurs
a. Between condenser and evaporator
b. In evaporator
c. Before expansion valve
d. Between compressor and condenser
e. Before expansion valve
Q. Co-efficient of performance of a Reversed Carnot cycle refrigerator working betweenhigher temperature T2 and lower temperature T1
a. will increase with increase in T1 keeping T2 fixed
b. will decrease with increase in T1 keeping T2 fixed
c. will first increase with increase in T1 and then decrease with increase T1 keeping T2 fixed
d. None of the above
Q. Bell-Colemann cycle comprises
a. two isentropic processes and two adiabatic processes
b. two isentropic processes and two isothermal processes
c. two isentropic processes and two isobaric processes
d. two isentropic processes and two isochoric processes
Q. The COP of Carnot Refrigerator is 3 and it produces 1 TR. The work that will be done is equal to
a. 70 kJ/min
b. 100 kJ/min
c. 200 kJ/min
d. 210 kJ/min
Q. In Bell – Colemann refrigerator for the same temperature range
a. COP of dense air system is equal to COP of open air system
b. COP of dense air system is lower than COP of open air system
c. COP of dense air system is higher than COP of open air system
d. COP of dense air system may be higher or lower than COP of open air system depending upon pressure ratio.
Q. A Bell-Colemann cycle is
a. reversed Carnot Cycle
b. reversed Joule Cycle
c. reversed Rankine cycle
d. None of the above