A.dehydrated
B.purged
C.plugged
D.evacuated
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A.combustion control air system
B.supply air system
C.ships service air system
D.low pressure deck air system
A.dry bulb temperature
B.wet bulb temperature
C.saturation temperature
D.water vapor superheat
A.The follow-up gear
B.The rudder angle indicator
C.The synchronous electric transmitter
D.A rudder angle limit switch
A.apparent slip
B.tree slip
C.pitch
D.propulsive efficiency
A.two or more impellers housed together in one casing and mounted on a single shaft
B.a single stepped impeller mounted in a progressively staged casing
C.a large radial clearance between the impeller and casing to prevent overheating due to
D.an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
A.add refrigerant to the system
B.adjust the thermal expansion valve to the proper setting
C.adjust the float valve to the proper holding pressure
D.open the hand expansion valve
A.a stuck solenoid valve
B.a shortage of refrigerant
C.too much oil in circulation
D.too much superheat
A.trick-wheel
B.follow-up control
C.six-way valve
D.Rapson slide
A.stress
B.strain
C.shear strength
D.ultimate tensile strength
A.increase discharge pressure
B.decrease pump capacity
C.decrease pump cavitation
D.decrease reaction ring clearance
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最新试题
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should ().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
When the steering gear is in operation, you should ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
Which of the following statements is correct concerning heat transfer?()
The general purpose of a heat exchanger is to ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().