單項(xiàng)選擇題In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by()

A.opening more bypass lines
B.opening additional expansion valves
C.adding refrigerant
D.speeding up the machine


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2.單項(xiàng)選擇題If a compressor runs continuously, the cause might be a()

A.defective thermal bulb
B.clogged scale trap
C.stuck high-pressure switch
D.stuck low-pressure switch

3.單項(xiàng)選擇題Which of the following would not cause high suction pressure?()

A.insufficient refrigeration
B.leaky suction valves
C.expansion valve stuck open
D.suction valve not adjusted properly

4.單項(xiàng)選擇題If the high-pressure switch on the compressor opens and stops the compressor a possible cause could be:()

A.too much cooling water going through the condenser
B.not enough refrigerant in the system
C.a leak in the evaporator coils
D.no enough cooling water going through the condenser

5.單項(xiàng)選擇題The scale trap is located between the ()

A.king valve and the expansion valve
B.solenoid valve and expansion valve
C.evaporator and receiver
D.compressor and evaporator