A.slightly opened
B.throttled
C.fully opened
D.halfway opened
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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
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
最新試題
One cause of high head pressure occurring in a refrigeration system can be （）.
The general purpose of a heat exchanger is to （）.
A grease gun is generally used to lubricate a （）.
A pressure drop through the refrigerant liquid line may cause （）.
When the steering gear is in operation, you should （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
Thermostatic expansion valves can be adjusted for （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.