A.compression stroke
B.suction stroke
C.expansion stroke
D.exhaust stroke
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A.greater distillate purity through high temperature evaporation
B.cold shocking for scale removal is not required
C.less internal corrosion because of lower brine density
D.less feed-water is required for equal plant capacity
A.refrigerant bubbles in the lube oil
B.refrigerant reducing the lube oil viscosity
C.oxidation of the lube oil from overheating
D.reducing the floc or cloud point of the oil
A.Cooling the air to a temperature just above dew point
B.Heating the air to a point at which moisture will boil off ,then re-cooling it
C.Cooling the air to a point below dew point, then reheating it
D.Heating the air and then cooling it to a point below dew point
A.broken valve springs
B.tight drive belts
C.high line voltage
D.air in the system
In order to achieve greater dehumidification with an air conditioning system, you should （）
Ⅰ.reduce the cooling coil
Ⅱ.temperature increase the re-heater temperature
A.Ⅰonly
B.Ⅱ only
C.BothⅠandⅡ
D.NeitherⅠnorⅡ
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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
The cetane rating of diesel fuel is an indication of the （）
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
Using a file without a handle may result in （）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
（） is not installed on the main switchboar.
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）