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If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.
A . high steam pressure in the boiler
B . abnormally high feed water temperature
C . abnormally high boiler water temperature
D . steam demand exceeding feed pump capacity
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On a ship，a fire pump may be used for other purposes if（）.
A . the other services are run off a reducing station with a pressure gage
B . a separate fire pump is available for use on the fire main
C . all other services are operated by a manifold near the pump
D . All of the above
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As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （） (1)the rotor (2)the pump shaft (3)the external surface of the housing
A . (1) only
B . (2) only
C . (1) and (2)
D . (1),(2)and(3)
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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 one
B . Reassemble the unit and provide more water leak off for proper lubrication
C . Check for parallel alignment of the sleeve radial faces to the sleeve bores
D . Reassemble the unit and adjust the governor to obtain a slower speed
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Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（） (1) gear (2) centrifugal (3) screw
A . （1）and（2）
B . （1），（2）and（3）
C . （1）and（3）
D . （2）and（3）
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（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.
A . A common rail engine；conventional engines
B . A conventional engine；common rail engines
C . A marine diesel engine；most other engines
D . A two-stroke engine；four-stroke engine
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If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.
A . packing gland
B . mechanical seals
C . lantern rings
D . wearing ring
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Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）
A . Close radial clearance between impeller hub and casing
B . Low rotational speed of impeller
C . Removable end plate
D . Replaceable impeller and casing wearing ring
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When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.
A . air chamber
B . head lank
C . primer
D . prime mover
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If an emergency pump control is used as the emergency shutdown on a tanker，it must（）.
A . stop the flow of oil at the main deck manifold
B . prevent the oil from leaving the shore facility
C . prevent the oil from siphoning through the pump
D . None of the above
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If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A . a low load on the unit
B . a clogged pump suction strainer
C . a blockage in the line between the pump and hydraulic motor
D . the hydraulic motor turning too fast
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The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.
A . closely observe the pump discharge temperature
B . close off the discharge valve, and watch for a rise in pressure
C . momentarily close off the suction valve, and watch for a rise in pressure
D . use a clamp on ammeter and compare the readings to past record
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If a hydraulic pump on a winch accidentally stops while hoisting,the load will stay suspended because（）.
A . a check valve will close that prevents reverse circulation
B . a centrifugal counterweight counteracts the force of gravity
C . the electric pump motor cut out
D . the control lever will move to the stop positio
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If a bilge pump failed to build up discharge pressure, you should check for （）.
A、The requirement for the oil content of bilge water discharged is 15 ppm.
B、No discharge in sensitive waters.
C、Any discharge in sensitive waters.
D、International, national or local requirements have to be observed.
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As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.
A . circular
B . elliptical
C . rectangular
D . hexago
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If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.
A . a check valve will close that prevents reverse circulation
B . a centrifugal counterweight counteracts the force of gravity
C . the electric pump motor will cut out
D . the control lever will move to the stop positio
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If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）
A . insufficient speed
B . cavitation
C . excess discharge pressure
D . excessive net positive suction head B
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When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.
A . check valve installed in the line
B . shut off valve at a manifold near the pump
C . quick disconnect union within ten feet of the pump
D . regulator in the line set at 125 psi
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A fire pump may be used for other purposes if（）.
A . the other services are run off a reducing station with a pressure gage
B . one of the required pumps is kept available for use on the fire main system at all times
C . no relief valves are installed
D . all of the above conditions are met
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If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）
A . only the replacement of the entire pump would be acceptable
B . the injection pump and injection nozzle must be replaced
C . either the barrel or plunger must be replaced
D . the barrel and plunger must be replaced as a unit
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If a hydraulic pump is overheating, the cause may be （）.
A、excessive internal leakage in the pump
B、low discharge pressure and fluid flow
C、excessive fluid level in the hydraulic reservoir
D、operation of the pump at 100% efficiency
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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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As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure
A . （1）
B . （1）and（2）
C . （2）
D . neither（1）nor（2）
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As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: (1) secure oil to fires; (2) increase feed pump pressure.
A.(1)
B.(1) and (2)
C.(2)
D.neither (1) nor (2)
