106. Which of the following is not a function of refrigerant oil ?
A.To remove heat
B.To lubricate the moving parts of the compressor
C.To help insulate the refrigerant lines
D.To form a seal for the compressor valves

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107. Oil separator in a refrigeration cycle is installed between the
A.Compressor and condenser
B.Condenser and metering device
C.Metering device and evaporator
D.Evaporator and compressor

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108. A receiver is fitted in refrigeration unit in order to
A.Allow for variation of load
B.Remove heat
C.Conserve heat
D.Form seal for compressor valves

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109. The following leak detector can be used on a positive halocarbon refrigerant system
A.Ammonia soaked swab
B.Sulphur candle
C.Electronic leak detector
D.Any one of the above

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110. Moisture in a refrigerant system is removed by
A.Driers
B.Filter-driers
C.Dessicants
D.All of the above

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111. Cooling water at the inlet of condenser of a refrigeration plant enters at 20?C and leaves at 25?C. The refrigerant would be condensing at about
A.20?C
B.25?C
C.30?C
D.15?C

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112. The ideal location for a filter-drier in a refrigeration cycle is the point where it will remove moisture before the moisture enters the
A.Coiidenser
B.Compressor
C.Colitside of system
D.Warn side of system

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