單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Mechanical energy in transition is referred to as （）.

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