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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 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
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单选题A centrifugal bilge pump requires priming （）.A
primarily to lubricate the shaft sealsB
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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
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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
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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
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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
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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
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单选题To operate a centrifugal fire pump at reduced capacity, you should （）.A
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单选题The most suitable pump for oily water separator feed duties is （）.A
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water seal pipe is pluggedB
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单选题To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the （）.A
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volute must impart a radial and rotary motion of the water suction sideC
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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
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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
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考题
单选题A centrifugal pump can’t supply water after startingYou should check （）.A
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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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bottom blow the boilerB
treat the water with caustic sodaC
treat the water with chemical scavengersD
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