120. What is the usual form of liquid oil particles in a refrigerant
A.Fine fog
B.Mist
C.Individual droplets
D.All of the above

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121. Which of the following refrigerants has highest refrigeration efficiency
A.Freon-11
B.Freon-22
C.R-12
D.R-113

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122. Chilled water with the application of principle of flash cooling is obtained by the following system
A.Absorption refrigeration system
B.Steam jet refrigeration system.
C.Vortex system
D.Electro-mechanical system

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123. Presence of flash gas in the liquid feed to the expansion valve can cause the problem of
A.Feeding the evaporator unevenly
B.Loss of cooling capacity
C.Damage to the valve
D.All of the above

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124. An evaporator pressure regulator performs the following function
A.Monitors evaporator temperature
B.Maintain compressor inlet pressure
C.Keeps pressure up for system needs
D.All of the above

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125. Theiefrigeration plants are charged by introducing refrigerants from the cylinder at the
A.Suction of compressor
B.Crank case of compressor
C.Evaporator
D.Receiver

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126. Which of the following refrigerants has the highest critical point pressure
A.Freon-11
B.Freon-12
C.Freon-22
D.Ammonia

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