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A spur gear pump should be operated with the discharge valves ______.
A.slightly opened
B.throttled
C.fully opened
D.halfway opened
参考答案
更多 “ A spur gear pump should be operated with the discharge valves ______.A.slightly openedB.throttledC.fully openedD.halfway opened ” 相关考题
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While on watch in the engine room, you hear a continuous sounding of the general alarm. Which of the following actions should you take?A.Make an entry in the official logbookB.Open the master control valves on the fixed CO2 systemC.Start the fire pump and check discharge pressureD.Secure auxiliary condenser overboard discharge
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If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?A.Pump only if the discharge is led to a shore tank or bargeB.Pump only during the hours of darknessC.Pump only on the outgoing tideD.Pump only as much as is necessary
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If you must pump bilges while a vessel is in port，you should pump only ______．A.If discharge is led to a shore tank or bargeB.During the hours of darknessC.On the outgoing tideD.As much as is necessary
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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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All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves
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单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
ram relief valves bypass oil to stop rudder movementB
six-way valve shifts to the neutral flow positionC
steering pump electric motor is de - energized by the transfer switchD
follow-up gear takes the hydraulic pump off stroke
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单选题When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）A
The six-way valve opensB
The steering service pump motor is stoppedC
The follow-up gear takes the pump off strokeD
The cylinder relief valves bypass oil to the suction side the pump
考题
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
pump would eventually overheatD
motor would overheat
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单选题Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to（）A
allow an alternate main pump to start in the fully loaded condition thus developing immediate full torqueB
prevent either main pump from being hydraulically motored when idle by cross pressure flowC
prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the systemD
all of the above
考题
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
考题
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
producing a smoother discharge flow
考题
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If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.A
run continuouslyB
not startC
have high discharge pressureD
short cycle on the high pressure switch
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单选题Which of the following is NOT true according to the passage?（）A
Both the main steering gear and the auxiliary steering gear should be operatedB
The alarms fitted to the remote control system should be operatedC
The emergency generator compartment should be checkedD
The communication system between the bridge and the steering gear compartment should be operated
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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
installed with a short radius elbow at the pump
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单选题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) screwA
（1）and（2）B
（1），（2）and（3）C
（1）and（3）D
（2）and（3）
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单选题All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.A
set the relief valveB
check the lubrication systemC
vent the pump casingD
open the pump suction and discharge valves
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单选题A diesel engine should not be operated at low loads for long periods of time because（）A
heavy carbon deposits will buildup on the valves and in the exhaustB
fuel dilution is increased at low loadC
exhaust valves may be damagedD
all of the above
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单选题If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.A
low compressionB
failure of the fuel pump to discharge fuelC
incorrect timing of fuel pumpD
turning gear being still on
考题
单选题While on watch in the engine room, you hear a continuous sounding of the general alarmWhich of the following actions should you take?（）A
Make an entry in the official logbookB
Open the master control valves on the fixed CO2 systemC
Start the fire pump and check discharge pressureD
Secure auxiliary condenser overboard discharge
考题
单选题To operate a centrifugal fire pump at reduced capacity, you should （）.A
readjust the relief valveB
throttle the suction lineC
throttle the discharge valveD
open the priming line
考题
单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）A
They should always be started with the discharge valve closedB
They should always be started with the discharge valve openedC
A priming pump is always required to flood the impeller suctionD
They should always be started with the sealing line valves closed
考题
单选题If fuel oil were being discharged from the waster outlet of a fuel oil disk type centrifuge, operated as separator, you should（）A
remove the discharge ringB
re-prime the purifierC
the centrifuge to its proper speedD
install an additional discharge ring
考题
单选题If a centrifugal pump were continually operated with the discharge valve closed, the （）.A
motor controller overload would openB
pump would eventually overheatC
relief valve would continuously cycle openD
motor would overheat
考题
单选题When starting a centrifugal pump, the discharge valve should be （）.A
closedB
opened fullyC
cracked openD
partly open
考题
单选题With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）A
Only one pump should be used at any timeB
The ship speed should be reduced to 70% of the normalC
Watch keeping of the steering gear should be increasedD
Limitations of the steering gear should be logged but the bridge need not be informed
考题
单选题A spur gear pump should be operated with the discharge valves （）.A
slightly openedB
throttledC
fully openedD
halfway opened
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