A.a stuck solenoid valve
B.a shortage of refrigerant
C.too much oil in circulation
D.too much superheat
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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
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
最新試題
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
Thermostatic expansion valves can be adjusted for （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
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?（）
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.