單項選擇題To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.

A.discharge service valve as a vapor
B.suction service valve as a liquid
C.charging valve as a liquid
D.condenser purge valve as a vapor


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1.單項選擇題When adding oil to a refrigeration system, precautions must be taken to ensure that （）.

A.the compressor suction pressure is not too high
B.all air is purged from the pump and charging fittings
C.the high pressure cutout switch is held open to prevent accidental starting
D.the condenser is completely shutdown first

2.單項選擇題In a refrigeration system, if the cooling water to the condenser fails, the（）.

A.box temperature solenoid valve will close
B.expansion valve will close
C.compressor will shutdown
D.king valve will open

3.單項選擇題Accidental flooding of the engine room bilges by the bilge main is prevented by （）.

A.stop-check valves installed in the bilge manifolds
B.using a positive displacement reciprocating bilge pump
C.installing eductors in all bilge rose boxes
D.installing a swing check before each bilge valve

4.單項選擇題Zinc rods are installed in the refrigeration system （）.

A.liquid strainer
B.liquid receiver
C.saltwater condenser
D.evaporator