A.trick-wheel
B.follow-up control
C.six-way valve
D.Rapson slide
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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
A.too much superheat
B.insufficient superheat
C.suction pressure too low
D.excessive refrigerant returning to the compressor
A.Needle
B.Tapered roller
C.Roller
D.Ball
A.insufficient lube oil circulating through the system
B.excessive circulation of lube oil through the system
C.insufficient refrigerant in the system
D.an overworked compressor
最新試題
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A pressure drop through the refrigerant liquid line may cause （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.