A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
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A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio
A.Reciprocating pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true
A.between the suction and discharge
B.below the liquid supply
C.above the liquid supply
D.any of the above
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （）
(1) reciprocating
(2) vane
(3) gear
A.（1）only
B.（1）and（2）
C.（1），（2）and（3）
D.（2）and（3）
最新試題
A salinity indicator is used to determine the （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
When the steering gear is in operation, you should （）.
Thermostatic expansion valves can be adjusted for （）.
Which of the following statements is correct concerning heat transfer?（）
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
The general purpose of a heat exchanger is to （）.