单项选择题
The refrigeration system low pressure cutout switch is actuated by （）.
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
相关考题
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单项选择题
Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.
A.fluid friction
B.fluid turbulence
C.component misalignment
D.pressure surges -
单项选择题
When you adjust a thermostatic expansion valve, （）.
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 -
单项选择题
If a centrifugal pump were continually operated with the discharge valve closed, the （）.
A.motor controller overload would open
B.pump would eventually overheat
C.relief valve would continuously cycle open
D.motor would overheat
