A.act as a shock absorber
B.maintain the stored oil under pressure
C.act as a base or foundation for the power unit
D.eliminate pressure surges in the system
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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
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
最新试题
()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated()
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()
Cold weather starting of a diesel engine may be made easier by()
The cetane rating of diesel fuel is an indication of the ()
Which of the following items don’t belong to dock repair works?()
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a()
Under MARPOL Code the ship to which it applies has to carry ()
If two A.C.generators are to be operated in parallel, the load is distributed evenly by()