單項(xiàng)選擇題Main steam and exhaust pipes for winches and similar gear shall not pass through crew accommodation nor, whenever technically possible, through alleyways leading to crew accommodation; where they do pass through such alleyways, they shall be adequately （）.

A.ventilated and tagged
B.ventilated and cooled down
C.insulated and encased
D.insulated and warmed up


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1.單項(xiàng)選擇題A solenoid valve used in a refrigeration system should be installed （）.

A.with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve
B.upright, sensing temperature of the box, and upstream of the thermal expansion valve
C.upright, sensing temperature of the box, and downstream of the thermal expansion valve
D.upright, sensing heat of the tail coil, and upstream of the thermal expansion valve

2.單項(xiàng)選擇題When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.

A.always be wide open when the compressor restarts
B.continue to operate as if the system were in operation
C.remain open until evaporator pressure equalizes, then close until the compressor restarts
D.always be completely closed until the compressor restarts

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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