材料：A typical example of a hydraulic governor is the Woodward. This has adjustable droop for parallel operation and it is fitted with a speed-adjusting control . If required it can be fitted with a synchronizing motor to provide remote control from a switchboard.A gear pump driven from the engine supplies oil under pressure to accumulator pistons under which is a by-pass to regulate maximum pressure. One branch supplies oil which acts on top of the power piston, the pressure always tending to turn the terminal shaft to shut off fuel, while the other branch supplies oil to the pilot valve which is operated by the linkage from the fly weights above.Should the speed of the engine decrease due to increased load the flyweights will move towards their center of rotation and lower the position of the pilot valve plunger, admitting oil pressure from the bottom of the power piston. Since, however, the area on the bottom is much greater than the top the net resultant force causes the piston to move upwards. This operates the power lever turning the terminal shaft which varies the cut-off point in the fuel pump through linkage, but as the power piston moves up, the actuating compensating piston moves down.Oil under this piston is now forced through the needle valve to the receiving compensating piston, raising the outer end of the floating lever and the pilot valve plunger until it has returned to its normal position. This stops further movement of the terminal shaft so that the fuel control is now set in a position corresponding to the increased fuel required to run the engine at normal speed under the increased load.问题：This passage is mainly about ___.A.what type of governor should be provided when the engine is used for electric power generationB.why the speed of the engine fluctuatesC.how the governor worksD.how the fuel pumps workThe oil from the gear pump will ___. ① be supplied to the accumulator ② act on the power piston ③ be supplied to the pilot valveA.①B.①②C.②③D.①②③Which of the following is true about the Woodward discussed?A.It is a kind of mechanical governor.B.It can not be used for parallel operation.C.It has speed droop.D.It may only be manually controlled from a switch boarE.When the speed of the engine decreases due to increased load, which of the following will NOT happen?A.The flyweights move towards their centerB.The pilot valve plunger moves towards its normal positionC.The power piston moves downwards until it returns to its normal positionD.The terminal shaft moves to a new position请帮忙给出每个问题的正确答案和分析，谢谢！

材料：

A typical example of a hydraulic governor is the Woodward. This has adjustable droop for parallel operation and it is fitted with a speed-adjusting control . If required it can be fitted with a synchronizing motor to provide remote control from a switchboard.

A gear pump driven from the engine supplies oil under pressure to accumulator pistons under which is a by-pass to regulate maximum pressure. One branch supplies oil which acts on top of the power piston, the pressure always tending to turn the terminal shaft to shut off fuel, while the other branch supplies oil to the pilot valve which is operated by the linkage from the fly weights above.

Should the speed of the engine decrease due to increased load the flyweights will move towards their center of rotation and lower the position of the pilot valve plunger, admitting oil pressure from the bottom of the power piston. Since, however, the area on the bottom is much greater than the top the net resultant force causes the piston to move upwards. This operates the power lever turning the terminal shaft which varies the cut-off point in the fuel pump through linkage, but as the power piston moves up, the actuating compensating piston moves down.

Oil under this piston is now forced through the needle valve to the receiving compensating piston, raising the outer end of the floating lever and the pilot valve plunger until it has returned to its normal position. This stops further movement of the terminal shaft so that the fuel control is now set in a position corresponding to the increased fuel required to run the engine at normal speed under the increased load.

问题：

This passage is mainly about ___.

A.what type of governor should be provided when the engine is used for electric power generation

B.why the speed of the engine fluctuates

C.how the governor works

D.how the fuel pumps work

The oil from the gear pump will ___. ① be supplied to the accumulator ② act on the power piston ③ be supplied to the pilot valveA.①

B.①②

C.②③

D.①②③

Which of the following is true about the Woodward discussed?A.It is a kind of mechanical governor.

B.It can not be used for parallel operation.

C.It has speed droop.

D.It may only be manually controlled from a switch boar

E.

When the speed of the engine decreases due to increased load, which of the following will NOT happen?A.The flyweights move towards their center

B.The pilot valve plunger moves towards its normal position

C.The power piston moves downwards until it returns to its normal position

D.The terminal shaft moves to a new position

请帮忙给出每个问题的正确答案和分析，谢谢！

相关考题：

This is the latest prototype.“prototype” here means a standard or typical example. () 此题为判断题(对，错)。
查看答案
The typical example of functional communication activities is role play. () 此题为判断题(对，错)。
查看答案
The typical example of functional communication activities is ination gap activities.() 此题为判断题(对，错)。
查看答案
If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will .A.have a larger than normal dead bandB.produce excessive speed response to a load changeC.respond slowly to any change in engine loadD.stabilize engine speed at the new governor setting
查看答案
When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .A.pick up more of any increase in loadB.pick up less of any increase in loadC.share an equal amount of any increase in loadD.drop an equal amount of any decrease in load
查看答案
A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust theA.pilot valve openingB.compensating needle valveC.compensating spring tensionD.accumulator spring tension
查看答案
The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by ______.A.dirtB.fuel oilC.governor cooling waterD.fuel oil tar(焦油)
查看答案
The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ______.A.load limit settingsB.idle speed settingsC.speed limit settingsD.speed droop settings
查看答案
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.Aram relief valves bypass oil to stop rudder movementBsix-way valve shifts to the neutral flow positionCsteering pump electric motor is de - energized by the transfer switchDfollow-up gear takes the hydraulic pump off stroke
查看答案
单选题Air bubbles in a hydraulic governor can cause （）Asluggish responseBspeed droop variationsCisochronous governingDsensitivity increase
查看答案
单选题Purging air from a hydraulic system is necessary when（）Aadding small amounts of oil to the systemBthe system has been overheatedCthe system has been drained and then filled with new oilDthe system has been idle for a long period of time
查看答案
单选题If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）Ahave a larger than normal dead bandBproduce excessive speed response to a load changeCrespond slowly to any change in engine loadDstabilize engine speed at the new governor setting
查看答案
单选题The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）Acompensate for low oil levelBincrease governor promptnessCprevent governor huntingDlimit engine load
查看答案
单选题A large change in ambient temperature, or using an oil of a viscosity different from the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the （）.Apilot valve openingBcompensating needle valveCcompensating spring tensionDaccumulator spring tension
查看答案
单选题What is the best way of stopping an over-speeding diesel engine?（）ADisconnect the battery cables from the starting motorBDrain the hydraulic fluid from the governor sumpCBlock the flow of cooling air to the radiatorDSecure the fuel supply and block the air intake
查看答案
单选题If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the（）Arack position should be adjustedBcompensating needle valve should be opened fully compensatingCneedle valve should be adjusted to stabilize operationDspeed limiting device should be adjusted
查看答案
单选题The most common contaminate of governor hydraulic fluid is （）.AmoistureBdirtCacidDair
查看答案
单选题In a simple mechanical governor, the （）Acentrifugal force rotates the ball-headBflyweight centrifugal force is balanced by spring forceCflyweight centrifugal force is balanced by hydraulic pressureDspeeder spring alone actuates the fuel control rod
查看答案
单选题To correct a hunting problem in a main propulsion diesel engine hydraulic governor, you should （）.Aincrease the governor oil pressureBadjust the speed droop settingCadjust the speeder spring travelDadjust the compensating needle valve
查看答案
单选题The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）AdirtBfuel oilCgovernor cooling waterDfuel oil tars
查看答案
单选题（） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.ABulbsBBulksCFlyweightsDFlywheels
查看答案
单选题When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.Apick up more of any increase in loadBpick up less of any increase in loadCshare an equal amount of any increase in loadDdrop an equal amount of any decrease in load
查看答案
单选题The load sharing characteristics of two diesel generator operating in parallel are mostly dependent on their governor （）.Aload limit settingsBidle speed settingsCspeed limit settingsDspeed droop settings
查看答案
单选题On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the （）Aaccumulator spring compressorBbalance pistonCcompensating needle valveDproportional piston
查看答案
单选题A diesel generator has just been paralleled with an AC turbo-generator, but the load can not be properly divided.This could be caused by（）Aan incorrect diesel generator governor speed droop adjustmentBa faulty reverse power relay within the main circuit breaker assemblyCunsynchronized isochronous load distribution adjustmentsDa different speed setting on each unit
查看答案
单选题The ability of the governor to prevent fluctuations in engine speed is termed （）.AsensitivityBstabilityCpromptnessDspeed droop
查看答案
单选题On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine （）Aspeed will drop drastically with any increase in loadBwill stop due to zero fuel supplyCwill stall upon application of loadDspeed will remain fairly constant despite load changes
查看答案
热门标签