单项选择题

A.diameter of the discharge piping, with all other fact……

Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.

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

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单项选择题If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.

A.run continuously
B.not start
C.have high discharge pressure
D.short cycle on the high pressure switch

单项选择题Which of the following terms could be applied to the simple definition the energy of motion?（）

A.Electrical energy
B.Thermal energy
C.Potential energy
D.Kinetic energy

单项选择题The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.

A.sliding block
B.pintle
C.reaction ring
D.tilting box or swash plate

单项选择题Badly leaking refrigeration compressor discharge valves will cause（）.

A.overfeeding of the expansion valve
B.damage to the condenser
C.constant running of the compressor
D.flooding of the receiver

单项选择题Mechanical energy in transition is referred to as （）.

A.horsepower
B.work
C.heat
D.velocity