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单选题
The static suction head of is the （）
A
distance of the suction liquid level above the line of the pump
B
distance the suction liquid level is below the center line of the pump
C
force necessary to overcome frictional losses in the pump and piping
D
amount in inches of mercury the total suction head is below atmospheric pressure
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更多 “单选题The static suction head of is the （）A distance of the suction liquid level above the line of the pumpB distance the suction liquid level is below the center line of the pumpC force necessary to overcome frictional losses in the pump and pipingD amount in inches of mercury the total suction head is below atmospheric pressure” 相关考题
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Which of the following terms is used to identify the pressure of the liquid entering a pump?A.Suction headB.Pump headC.Discharge headD.Total head
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Which statement is TRUE concerning cargo hose on tank barges ________．A.Cargo hose must be able to withstand the shut-off head plus the static head of the cargo pumpB.Cargo hose must be able to withstand the static head of the cargo pump but no less than 100 psiC.Cargo hose must be able to withstand the shut-off head less the static head of the cargo pump but no less than 100 psiD.Cargo hose must be able to withstand at least 150 psi
考题
删除*（head-next）的操作是（）A、p=head-next；head-next=head-next-next；delete p；B、head-next=head-next-next；p=head-next；delete p；C、p=head；head=head-next；delete p；D、head=head-next；p=head；delete p；
考题
单选题What is the purpose of pressure-vacuum relief valves? （）A
Regulation of discharge pressure from cargo pumpsB
Maintaining constant velocity in cargo linesC
Regulation of suction head on cargo pumpsD
To maintain a tank or void at atmospheric pressure
考题
单选题If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）A
insufficient speedB
cavitationC
excess discharge pressureD
excessive net positive suction head B
考题
单选题A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.A
have a greater head capacityB
operate with increased impeller efficiencyC
discharge through the suction side of the pump casingD
require more power to run the shaft
考题
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
in order to overcome the potential energy of water in the discharge line
考题
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
考题
单选题Oil pressure in the lubrication system is（）than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.A
higherB
lowerC
very higherD
very lower
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单选题Oil pressure in the lubrication system is （） the static sea water head to ensure that sea water （） the stem-tube.A
lower than；can lubricateB
lower than；can coolC
higher than；can enterD
higher than ；cannot enter
考题
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
the relief valve should open before the high pressure cutoutB
the relief valve should open and allow the excess refrigerant to flow to the receiverC
the high pressure cutout switch should operate before the relief valve opensD
you should close in on the suction valve
考题
单选题A pump is said to have "negative suction head" when the pump is located （）.A
between the suction and dischargeB
below the liquid supplyC
above the liquid supplyD
any of the above
考题
单选题删除*（head-next）的操作是（）A
p=head-next；head-next=head-next-next；delete p；B
head-next=head-next-next；p=head-next；delete p；C
p=head；head=head-next；delete p；D
head=head-next；p=head；delete p；
考题
单选题The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.A
cylinder head water outlet headerB
cylinder jacket inlet mainC
heat exchanger inlet connectionD
jacket water pump suction line
考题
单选题What does the term head mean when applied to a fire pump?（）A
Length of the discharge pipeB
Height of the discharge pipeC
Difference between the discharge and suction pressuresD
Sum of discharge and suction pressures
考题
单选题If the head pressure is too high,（）A
the relief valve should open before the high-pressure cutoutB
the relief valve should open and let excess refrigerant go to receiverC
the high-pressure cutout switch should operate before the relief valve opensD
close in on the suction valve
考题
单选题Which of the following would not cause high suction pressure?（）A
insufficient refrigerationB
leaky suction valvesC
expansion valve stuck openD
suction valve not adjusted properly
考题
单选题Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.A
one size smaller than the pump suction nozzleB
the same size as the pump suction nozzleC
one size larger than the pump suction nozzleD
installed with a short radius elbow at the pump
考题
单选题Standby or emergency diesel generator day tanks should always be kept full to reduce the possibility of（）A
sediment contaminationB
fuel filter cloggingC
moisture formationD
inadequate transfer pump suction head
考题
单选题In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）A
The solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloadedB
The solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be openedC
When the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unloadD
The solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder
考题
单选题Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）A
Increased suction head pressureB
Decreased feedwater temperatureC
Pump recirculating line being open too muchD
Excessive feedwater temperature
考题
单选题The pressure of a liquid leaving the pump can be referred to as the （）.A
total headB
discharge headC
net positive suction headD
suction head
考题
单选题When operating with a negative suction head, which of the following types of pumps will require priming?（）A
ReciprocatingB
CentrifugalC
RotaryD
Gear
考题
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）A
one valve seats upwards, while the other seats downwardsB
the reed valves used on the discharge are made substantially thicker and heavier than the suction valvesC
the suction valve springs exert a greater tension than the discharge valve springsD
the discharge valve springs exert a greater tension than the suction valve springs
考题
单选题A simple pumping system consists of a suction branch, a pump and （）.A
a priming deviceB
a discharge branchC
a filterD
a suction valve
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