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
单选题
If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）
A
have a larger than normal dead band
B
produce excessive speed response to a load change
C
respond slowly to any change in engine load
D
stabilize engine speed at the new governor setting
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相关考题：
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
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
On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the______.A.accumulator spring compressionB.balance pistonC.compensating(补偿) needle valveD.proportional piston
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！
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)
单选题Air bubbles in a hydraulic governor can cause （）Asluggish responseBspeed droop variationsCisochronous governingDsensitivity increase
单选题Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）Amaximum power at a normal loadBmaximum power and load under normal conditionsChalf speed and normal temperatureDnormal operating temperature without a load
单选题The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.Abe jammedBbe openedCbe seatedDbe broken
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
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
单选题（） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.AMotorsBCheck valvesCSafety valvesDReducing valve
单选题What type of valve is used to direct the flow of hydraulic fluid?（）ARelief valveBDirection control valveCStop valveDPressure control valve
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
单选题During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.Aensure penetration and distribution of the fuel in the combustion chamberBensure the needle valve is flushed clean during each injectionCprevent combustion gas blowback into the open needle valveDprevent reflected pressure waves when the needle valve closes
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
单选题Diesel engine air start valve timing is controlled by（）Aengine operating speedBan air manifoldCa hydraulic distributorDindividual cams and valve gear
单选题If a main propulsion diesel engine hunts excessively at idle speed, you should （）Aadjusts the idle speed controlBdrain and flushes the governor and replace the oilCadjusts the compensating needle valve
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
单选题（） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.ABulbsBBulksCFlyweightsDFlywheels
单选题The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.Atape faceBtapered faceCsurfaceDthinner face
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
单选题When the heat load begins to increase, the needle valve of an expansion valve will（）Amove in an opening directionBmove in a closing directionCeither open or closeDnot move at all
单选题A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.Athe four-way control valve failing to shiftBthe bleeder valve sticking in the open positionCcold hydraulic fluidDa clogged air vent falter on the oil reservoir
单选题Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.Areact with insufficient speed droopBfail to react to small speed changesChave excessive sensitivity to small speed changesDremain in the neutral position
单选题A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in （）Apilot valve oil pressureBspeeder spring forceCcompensation needle valve clearanceDcentrifugal force on the flyweights