单选题By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by ().Arotary compressorsBreciprocating compressorsCcentrifugal compressorsDscrew compressors

单选题
By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by ().
A

rotary compressors

B

reciprocating compressors

C

centrifugal compressors

D

screw compressors


参考解析

解析: 暂无解析

相关考题:

Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to _____________.A.higher speed requiredB.flywheel-effectC.lower starting temperaturesD.higher compression pressures

Cold weather starting of a diesel engine is more difficult than warm weather starting due toA.use of low viscosity oil in cold weatherB.increased moisture content of inlet air in cold weatherC.increased drag of pistons and bearings due to increased oil viscosityD.higher compression pressures reached due to smaller clearances existing in the engine during cold weather

In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A.Noise coming from that air starting valveB.Continuous operation of the starting air compressorC.Zero air pressure in the air starting systemD.Overheated starting air pipe to the cylinder head

单选题If a diesel engine turned over freely but failed to start, the cause could be ()Awater in the fuelBcold lube oilCexcessive starting air pressureDexcessive fuel pressure

单选题A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from ()Alow lube oil temperatureBlow starting air temperatureCair in the fuel injectionDwater in the starting air system

单选题The starting of a marine diesel engine is generally carried out with the assistance of ().Acompressed airBelectricityChydraulic oilDcompressing air

单选题Stating a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by ()Aincreasing the quantity of starting airBincreasing the lube oil pressureCheating the engine fuel supplyDheating the engine jacket water

单选题Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an()Aincrease in starting air pressureBincrease in lube oil viscosityCcompression expansion deviceDjacket water heater

单选题Before starting a diesel engine that has an engine driven lube oil pump, the engineer should ().Aopen the bypass lineBcut in the lube oil coolerCpressurize the lube oil systemDtop off the expansion tank

单选题Diesel engine cylinder head test cocks are used to()Acheck cylinder lubrication prior to starting engineBconnect exhaust gas analyzers to determine engine efficiencyCpressure test cylinder heads to check for leaksDremove moisture accumulations from cylinder prior to starting

单选题Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by ()Aincreasing the quantity of starting airBincreasing the lube oil pressureCheating the engine fuel supplyDheating the engine coolant

单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?()AHolding the valve open for a long periodBIncreasing the starting air pressure usedCOpening the stating air valve quicklyDReducing the starting air valve size

单选题Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to()Ahigher speed requiredBflywheel-effectClower starting temperaturesDhigher compression pressures

单选题Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?()ACarbon dioxideBCarbon monoxideCCarbon trioxideDHydrogen sulfide

单选题The is employed to warm up a large diesel engine before its starting()Ahot airBhot boiler waterCcylinder waterDhot seawater

单选题Cold weather starting of a diesel engine may be made easier by()Adecreasing the compression ratioBusing a special fuel having a high ignition temperatureCincreasing the starting air supplyDheating the jacket water

单选题A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must ()Aline up the engine fore restarting with light diesel oilBreposition the fuel injection camCchange the intake and exhaust valve cam positionsDplace the starting cam in the intermediate position

单选题Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to ()Atest the starting systemBremove condensation from the cylindersCcheck the compressionDcheck for proper lube oil pressure

单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine()Ahas little or no internal frictionBhas a lower effective compression ratioCoperates with scavenge air under a positive pressureDoperates without energy absorbing intake and exhaust strokes

单选题A diesel engine cranks properly during starting but immediately stallsWhich of the following systems is most likely at fault?()AHydraulic startingBElectric startingCIgnitionDFuel

单选题Which of the following should always be checked prior to starting a diesel engine?()AAir filtersBFuel oil strainersCCrank case oil levelDPyrometer readings

单选题When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be ()Aan obstruction in an cylinderBwater accumulation in some engine cylindersClow starting air pressureDlow scavenge air pressure

单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?()Anoise coming from that air starting valveBcontinuous operation of the starting air compressorCzero air pressure in the air starting systemDoverheated starting air pipe to the cylinder head

单选题Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?()Atemperature of the intake airBfriction within the engineCmechanical condition of the superchargerDmechanical condition of the turbocharger

单选题The highest pressure in a diesel engine cylinder normally occurs ().Aat TDCBbefore TDCCafter TDCDduring air starting

单选题The diesel engine must be started before it can run by it self For this purpose () has to be used.Aa starting systemBthe starting airCa starting operationDA, B and C

单选题A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is ()Aone-half engine speedBthe same as engine speedCtwice engine speedDfour times engine speed