A.damaged intake valves
B.excessively tight mounting bolts
C.insufficient cylinder lubrication
D.a loose piston
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A.an electric system manager
B.a sensing bulb at the tail coil of the evaporator
C.pressure changes in the suction line
D.failure of the king solenoid valve
A.fluid friction
B.fluid turbulence
C.component misalignment
D.pressure surges
A.refrigerant must be bled off the sensing line before adjustments are made
B.all refrigerant must be pumped into the receiver before adjustments are made
C.time must be allowed for conditions to stabilize in the evaporator before further adjustments are made
D.all refrigerant must be routed through the dehydrator while changing the superheat setting
A.motor controller overload would open
B.pump would eventually overheat
C.relief valve would continuously cycle open
D.motor would overheat
A.have a greater head capacity
B.operate with increased impeller efficiency
C.discharge through the suction side of the pump casing
D.require more power to run the shaft
最新試題
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
One cause of high head pressure occurring in a refrigeration system can be （）.
A salinity indicator is used to determine the （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
A salinity indicator is used to determine the （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
A grease gun is generally used to lubricate a （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.