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单选题
If you were operating a centrifugal water service pump with worn wearing rings, the （）.
A
pump would be very noisy
B
pump would vibrate excessively
C
pump would develop insufficient flow
D
stuffing box would leak excessively
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单选题If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.A
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单选题If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）A
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单选题If a centrifugal bilge pump were continually operated with the discharge valve closed the （）.A
motor overload would openB
relief valve would openC
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单选题A centrifugal bilge pump requires priming （）.A
primarily to lubricate the shaft sealsB
due to the inability of this type of pump to lift water to cover the suction (eye) of the impellerC
to initially unload the pump by having its head pressure equal to discharge pressureD
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单选题Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.A
insulate your shoesB
ground the fire hoseC
secure its power supplyD
start the fire pump
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单选题Which pump installation would require an external source of sealing water?（）A
Main circulator pump jacket water coolingB
Salt water service pumpC
Auxiliary condensate pumpD
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单选题One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.A
maintain radial alignment between the pump impeller and casingB
absorb all impeller shaft end thrustC
prevent water leakage to the atmosphereD
prevent wear of the pump casing and/or impeller
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单选题When oily water separator is operating, which measure （） is wrong.A
pay attention to operating parametersB
renew and clean separating units in timeC
check oil level in separator to prevent overloadD
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单选题（）is used in typical marine pattern self-contained unit.A
a water cooled condenserB
a slop tankC
a expansion tankD
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单选题To operate a centrifugal fire pump at reduced capacity, you should （）.A
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throttle the suction lineC
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单选题The most suitable pump for oily water separator feed duties is （）.A
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a vane pumpC
a centrifugal pumpD
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loss of suction in the circulating pumpB
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broken raw water pump shaftD
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单选题A centrifugal pump may fail to deliver water when first started if the （）.A
water seal pipe is pluggedB
pump is not primedC
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单选题Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）A
The pump delivers full capacity when started, but gradually slackens off toan abnormally low flowB
The pump packing gland overheats after short operating periodsC
The motor over-current protective device continually shuts the pump downD
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单选题Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）A
CopperB
Copper and carbonC
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Bronze
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单选题To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the （）.A
pump must always be primedB
volute must impart a radial and rotary motion of the water suction sideC
connection must guide the liquid to the lantern ringsD
stuffing box should not be allowed any water leakage
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单选题If a centrifugal pump were continually operated with the discharge valve closed, the （）.A
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单选题The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.A
closely observe the pump discharge temperatureB
close off the discharge valve, and watch for a rise in pressureC
momentarily close off the suction valve, and watch for a rise in pressureD
use a clamp on ammeter and compare the readings to past records
考题
单选题On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）A
centrifugal pump is cheaper than reciprocating pumpB
the size of centrifugal pump with same capacity is smaller than that of reciprocating pumpC
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考题
单选题A centrifugal pump can’t supply water after startingYou should check （）.A
priming waterB
power supplyC
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单选题Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）A
Correct the cause of the scoring and repair the sleeve or replace with a new oneB
Reassemble the unit and provide more water leak off for proper lubricationC
Check for parallel alignment of the sleeve radial faces to the sleeve boresD
Reassemble the unit and adjust the governor to obtain a slower speed
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单选题If an operating auxiliary boiler has a water pH reading of 7, you should （）.A
bottom blow the boilerB
treat the water with caustic sodaC
treat the water with chemical scavengersD
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