單項選擇題Which is the pollution prevention equipment?()

A.booster pump
B.evaporator
C.incinerator
D.cooler


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1.單項選擇題Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of ().

A.wax precipitation in the lube oil
B.contamination by dust, scale, or moisture
C.refrigerant bubbles in the lube oil
D.refrigerant reducing the lube oil viscosity

2.單項選擇題In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by ().

A.increasing refrigerant pressure in the coil
B.increasing chilled water flow through the cooler
C.sub-cooling the refrigerant in the condenser
D.superheating the refrigerant in the compressor

3.單項選擇題A re-heater in an air conditioning system functions to ().

A.control inlet air temperature
B.control inlet air volume
C.maintain relative humidity at 15%
D.restore conditioned air temperature to a comfortable level

4.單項選擇題If one of the bilge system manifold valves does not properly seat, the ()

A.bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied
B.bilge system will lose vacuum and prevent the other bilges from being pumped out
C.bilge well aft connected to that valve will siphon its contents to the forward bilge wells
D.discharge pressure will be too high

5.單項選擇題An exhaust gas bypass is installed on a waste heat boiler in order to ().

A.bypass exhaust gas at high loads to prevent excessive back pressure
B.bypass a portion of the exhaust gas at peak loads for better efficiency
C.recycle exhaust gas to the turbocharger
D.minimize moisture condensation in the boiler gas passages at low loads

最新試題

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

題型:單項選擇題

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a()

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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

題型:單項選擇題

The main purpose of port State control is not to()

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Cold weather starting of a diesel engine may be made easier by()

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To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()

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The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated()

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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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Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?()

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

題型:單項選擇題