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
Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）
A
maximum power at a normal load
B
maximum power and load under normal conditions
C
half speed and normal temperature
D
normal operating temperature without a load
参考解析
解析：
暂无解析
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
What type of valve is used to direct the flow of hydraulic fluid?A.relief valveB.direction control valveC.stop valveD.pressure control valve
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
单选题（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.AOverflow valveBReducing valveCBalancing valveDReducing valve or balancing valve
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Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.Acontrol the back pressure of return oilBlock the oil lines under some conditionsCchange the direction of oil flowDact as relief valve
单选题When you adjust a thermostatic expansion valve, （）.Arefrigerant must be bled off the sensing line before adjustments are madeBall refrigerant must be pumped into the receiver before adjustments are madeCtime must be allowed for conditions to stabilize in the evaporator before further adjustments are madeDall refrigerant must be routed through the dehydrator while changing the superheat setting
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Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）ASpring-centered valveBUnloading valveCThree-position valveDTwo-position valve
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Which of the following devices is common to both mechanical and hydraulic governors?（）ADirect linkage between the ball-head and fuel rackBA servomotorCA compensating deviceDFlyweights
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Which of the following problems will occur if the internal drain at either end of a hydraulic, two-way, spool-type directional control valve cylinder were to become plugged?（）AThe reservoir would become vapor boundBThe valve would be placed in hydraulic lockCThe spring loaded relief ports would openDThe buffering chambers would be unable to function
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If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.Aa low load on the unitBa clogged pump suction strainerCa blockage in the line between the pump and hydraulic motorDthe hydraulic motor turning too fast
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