A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously
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A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity
A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue
A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor
A.petroleum crystals
B.phosgene gas
C.water vapor
D.carbon monoxide
A.be clear
B.be blue
C.be light green
D.show bubbles
A.temperature in the space being cooled
B.liquid refrigerant pressure at the solenoid valve
C.pressure drop across the evaporator coils
D.refrigerant gas superheat at the coil outlet
A.remains the same
B.is reduced
C.is increased
D.is eliminated
A.corrosion on the gears
B.excessive gear speed
C.dirt in the oil
D.misalignment of the gears
A.maintain alignment when the ship’s hull is working in heavy seas
B.ensure engine vibrations correspond to the natural frequency of the hull
C.permit the engine to expand away from the driven equipment as the engine heats up and expands
D.maintain engine thrust bearing clearances
A.must churn the oil in the sump
B.is connected to the propeller shaft
C.is driven at the highest RPM
D.compensates for alignment variations between the engine and pinion gear
最新试题
To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()
Flame failure in an automatically fired auxiliary boiler can from a/an ()
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the()
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is()
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()
To proceed to the assistance of a ship in distress is()
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated()
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()