A.closely observe the pump discharge temperature
B.close off the discharge valve, and watch for a rise in pressure
C.momentarily close off the suction valve, and watch for a rise in pressure
D.use a clamp on ammeter and compare the readings to past records
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A.removing all but the frictional load during starting
B.relieving intercoolers of high temperature buildups
C.providing high starting torque in the drive motor
D.seating valve plates during compressor shutdown
A.loose expansion valve control bulb
B.low differential setting on the H-Pcutout
C.blown fuse in the motor circuit
D.faulty suction pressure regulator
A.prevent an internal explosion in the pump when it is overheated
B.enable a visual inspection of the pump while it is running
C.insure a proper alignment of the pump coupling to the driver
D.accommodate for friction between the impeller and the easing
A.explosive range
B.flash point
C.ignition temperature
D.combustion temperature
A.the pressure regulating valve is not closing
B.an excessive lack of refrigerant in the system
C.badly leaking discharge valves
D.worn piston rings
A.Both are higher than normal burning temperatures
B.The flash point is always higher
C.The ignition temperature is always higher
D.They are not necessarily related
A.tend to twist about its long axis
B.expand in length and in diameter
C.contract in length and expand in diameter
D.flex at right angles to the applied pressure
A.holding the discharge valve open
B.relieving the intercooler pressure to the atmosphere
C.using an enlarged, permanently opened clearance expansion space
D.a pre-charged accumulator
A.within the space concerned
B.outside the space concerned
C.the throttle station
D.within the fire room
A.leaking discharge valve
B.jammed suction valve
C.tripped overload relay
D.broken discharge un-loader
最新试题
Which of the following statements is correct concerning heat transfer?()
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
Which of the listed pumps is NOT a positive displacement pump?()
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?()
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
Thermostatic expansion valves can be adjusted for ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().