A.increase speed
B.increase the size of the cardent assembly
C.reduce wearing ring clearances
D.change the pump to a "close coupled" arrangement
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A.Chemical energy
B.Mechanical energy
C.Thermal energy
D.Electrical energy
A.air bubbles in the sight glass
B.any leaks in the system
C.over-travel in the rudder angle indicator
D.lost motion in the rams
A.The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow
B.The pump packing gland overheats after short operating periods
C.The motor over-current protective device continually shuts the pump down
D.Pounding noises can be heard at the pump suction chest
A.diameter of the discharge piping, with all other factors remaining the same
B.diameter of the suction piping, with all other factors remaining the same
C.width of the impeller only
D.diameter of the impeller
A.run continuously
B.not start
C.have high discharge pressure
D.short cycle on the high pressure switch
最新試題
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
The general purpose of a heat exchanger is to （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.