A.water-tube
B.fire-tube
C.exhaust gas
D.none of the above
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A.scaled
B.informed
C.leaky
D.deformed
A.sealed
B.cracked
C.shape changed
D.deformed
A.deformed
B.rusted
C.cracked
D.scaled
A.in series
B.in parallel
C.either A or B
D.None of the above is tree
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.（2）and（3）
D.（1），（2）and（3）
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Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Which of the listed pumps is NOT a positive displacement pump?（）
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
Thermostatic expansion valves can be adjusted for （）.
A grease gun is generally used to lubricate a （）.