A.worn bearings and piston pins
B.slugging due to flooding back
C.too much oil in circulation
D.All of the above
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A.superheated
B.super-cooled
C.at or below the dew point
D.All of the above
A.open the steam line mot valve
B.drain the steam cylinder
C.close the steam cylinder drains
D.open the liquid cylinder drains
A.rudder will respond sluggishly
B.hydraulic rams will over-speed
C.sight glass will show bubbles
D.ram relief valves will lift
A.continuous running of the compressor
B.high suction pressure
C.high discharge pressure
D.short cycling of the compressor on the water failure switch
A.the cooling effect of the condensate reduces the compressors efficiency
B.a danger of explosion exists whenever water is present in a compressor
C.water causes erratic operation of pneumatic components
D.the volumetric capacity of the first stage is reduced if water remains
A.the compressor short cycling on high pressure cut out switch
B.high suction pressure
C.high head pressure
D.bubbles in the sight glass
A.The two objects must be in physical contact
B.The two objects must be the same size
C.There must be an existing temperature differential
D.There must be an existing weight differential
A.insufficient lubrication
B.insufficient refrigerant
C.excess refrigerant
D.excessive opening of the expansion valve
A.increase compressor discharge pressure on demand
B.increase compressor operating speed as necessary
C.allow the motor to turn the compressor opposed only by friction
D.reduce the compressor frictional load when starting
A.Radiation
B.Conduction
C.Convection
D.Each of the above
最新试题
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
When the steering gear is in operation, you should ().
If the head pressure of a reciprocating refrigeration compressor is excessive, ().
Which of the listed pumps is NOT a positive displacement pump?()
A grease gun is generally used to lubricate a ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
The major source of chemical contaminants in hydraulic fluid is ().
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().