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The discharge flow of a reciprocating pump is ______.
A.steady
B.in pulsation
C.continuous
D.large
参考答案
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Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.A.suctionB.exhaustC.pressureD.discharge
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单选题What is the function of wearing rings found on some centrifugal pumps? （）A
Absorb erosion of high velocity discharge streamB
Seal pump shaft against entry of airC
Isolate the outlet side from the inlet sideD
Dampen the turbulent discharge flow
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单选题Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）A
Oil is discharged from the impeller through the outletB
Gravity causes the oil to flow toward the dischargeC
The self-priming feature of the centrifugal pump enables it to draw its own suction as it startsD
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单选题What is a function of the wearing rings used in most centrifugal pumps?（）A
Absorb erosion of high velocity discharge streamB
Seal pump shaft against entry of airC
Isolate the discharge side from the suction sideD
Dampen the turbulent discharge flow
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单选题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 pumpB
Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weightC
Rotary pumps occupy only one-half the space of reciprocating pumpsD
Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
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单选题Air chambers are usually fitted to reciprocating pumps in order to （）.A
increase discharge pressureB
increase suction vacuumC
develop pulsation flowD
keep a steady rate of flow
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单选题Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（） (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build upA
（1），（2）B
（2），（3）C
（1），（2），（3）D
（2）only
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单选题In a full flow type lube oil system, the bypass relief valve will lift due to （）A
a clogged filter elementB
excessive lube oil pump discharge pressureC
excessive lube oil flowD
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单选题An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.A
maintaining a steadier speedB
delivering liquids over greater distancesC
operating for longer periods of timeD
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单选题Which method should be used to warm up the pump turbines prior to discharge（）.A
Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB
Run the pump at high speed with the discharge valves closedC
Run the turbine at slow speed with the pump disconnectedD
Shut the discharge valve and run the pump at slow speed
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单选题The static suction lift of a pump is the difference in elevation between the （）.A
centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pumpB
centerline of the pump and the suction liquid level when the source of liquid is above the pumpC
centerline of the pump and the level of the discharge liquidD
liquid levels of the suction and discharge
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单选题Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.A
one size larger than the pump discharge nozzleB
the same size as the pump discharge nozzleC
one size smaller than the pump discharge nozzleD
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单选题A relief valve for a cargo pump is generally installed（）.A
after the discharge valveB
between the pump and discharge valveC
after the suction valveD
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单选题A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.A
mechanical energy to kinetic energy to potential energyB
mechanical energy to potential energy to kinetic energyC
potential energy to mechanical energy to kinetic energyD
kinetic energy to mechanical energy to potential energy
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单选题The （） discharge a nearly constant amount of liquid regardless of pressure.A
mixed-flow pumpB
axial-flow pumpC
centrifugal pumpD
displacement pump
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单选题The discharge flow of a reciprocating pump is （）.A
steadyB
in pulsationC
continuousD
large
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单选题The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.A
ensure feed water flow into the boilerB
keep the steam drum pressure highC
prevent water hammer in the feed lineD
help the feed water flash to steam
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单选题An increase in rotor clearances in a rotary pump will （）.A
increase discharge pressureB
decrease pump capacityC
decrease pump cavitationD
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单选题The advantage of a centrifugal pump as compared with a reciprocating pump is that （）.A
discharge is continuousB
it has no internal valvesC
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all of the above are true
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单选题Bad valves operation of the reciprocating air compressors can be detected by observation of （）.A
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the discharge temperature highC
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单选题A centrifugal pump attempting to develop flow against a closed discharge valve has a/an （）.A
capacity of 0%B
efficiency of 100%C
internal slippage of 0%D
shut off horsepower rating of 100%
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centrifugal pump is cheaper than reciprocating pumpB
the size of centrifugal pump with same capacity is smaller than that of reciprocating pumpC
centrifugal pump makes maintenance easier than reciprocating pump doesD
all of the above
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varying the pump discharge pressureB
varying the pump return pressureC
rotation of the pump plungerD
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