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
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
When the steering gear is in operation, you should （）.
A grease gun is generally used to lubricate a （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the following statements is correct concerning heat transfer?（）