A、misalignment or worn main bearings
B、insufficient cylinder lubrication
C、defective or poorly fitted valves
D、all of the above
更多“If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.”相关的问题
A、centrifugal pump is cheaper than reciprocating pump B、the size of centrifugal pump with same capacity is smaller than that of reciprocating pump C、centrifugal pump makes maintenance easier than reciprocating pump does D、all of the above
A、are tracked on reciprocal bearings B、are tracked at the same range C、are tracked on the same bearing D、pass close together
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
A、are tracked on reciprocal bearings B、are tracked at the same range C、are tracked on the same bearing D、pass closely to each other
A、reciprocating at the piston pin, rotary at the crank pin B、reciprocating at the crank pin, rotary at the piston pin C、straight reciprocation D、straight rotation
A、reciprocating motion of exhaust valves B、rotary motion of the camshaft C、reciprocating motion of the piston D、developed differential
A、A.the relief valve should open before the high pressure cutout B、B.the relief valve should open and allow the excess refrigerant to flow to the receiver C、C.the high pressure cutout switch should operate before the relief valve opens D、D.you should close in on the suction valve
A、head-on situation B、crossing situation C、overtaking situation D、close-quarters situation
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