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


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1.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

2.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

3.單項(xiàng)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(xiàng)選擇題Zinc rods are installed in the refrigeration system （）.

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

5.單項(xiàng)選擇題（）is a series of trials done at sea to determine whether the ship has met the specifications of design, modification, or repair.

A.SEA WORTHINESS
B.SEA TRIALS
C.TRIAL-AND-ERROR
D.DOCK TRIALS

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A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

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When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

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During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

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Under MARPOL Code the ship to which it applies has to carry （）

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The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

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If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

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The shipboard oil pollution emergency plan will be invalid after （）

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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

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