單項選擇題Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?（）

A.The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
B.Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
C.Rotary pumps occupy only one-half the space of reciprocating pumps
D.Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump


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1.單項選擇題If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.

A.misalignment or worn main bearings
B.insufficient cylinder lubrication
C.defective or poorly fitted valves
D.all of the above

2.單項選擇題Why are removable sleeves installed on centrifugal pump shafts?（）

A.They make it easier to replace the pump shaft packing
B.They can be economically replaced as they wear out
C.They can be removed when it is necessary to lighten the weight of the pump
D.They increase the strength of the shaft

4.單項選擇題An axial軸向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned （）.

A.radially from the shaft
B.parallel to each other and to the shaft
C.parallel to each other but at a right angle to the shaft
D.at an angle to each other and to the shaft