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单选题
Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（）
A
TBN of the lubricating oil
B
Temperature of the lube oil
C
Completeness in the mixing of the fuel and air
D
Temperature of the cooling (sea) water
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更多 “单选题Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（）A TBN of the lubricating oilB Temperature of the lube oilC Completeness in the mixing of the fuel and airD Temperature of the cooling (sea) water” 相关考题
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Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A.Pressure-reducing valveB.Unloading valveC.Counterbalance valveD.Pressure-relief valve
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Which of the listed devices is used to measure pressure and convert it to an electrical signal?A.TransducerB.ReducerC.TransformerD.Rectifier
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单选题Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）A
Pressure-reducing valveB
Unloading valveC
Counterbalance valveD
Pressure-relief valve
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单选题Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）A
Improper fuel rack positioningB
Lengthy opening of the exhaust valveC
Excessively early injection timingD
Extended light load operation
考题
单选题Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）A
clogged air filterB
compression strokeC
burned exhaust valvesD
all of the above
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单选题Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）A
Constant volumeB
Constant pressureC
Pulse pressureD
Radial flow
考题
单选题The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.A
High lube oil pressureB
High jacket water pressureC
High jacket water temperatureD
Low jacket water pressure
考题
单选题For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）A
Chilled water system supply temperatureB
Chilled water system return temperatureC
Compressor discharge temperatureD
Compressor suction pressure
考题
单选题Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?（）A
Loss of compression for that cylinderB
Misfiring or rough runningC
Damage to the valveD
All of the above
考题
单选题Which of the listed cylinder liner surface conditions indicates proper lubrication?（）A
Dull black appearanceB
Bright appearanceC
Thin layer of lacquerD
Thick oily film
考题
单选题Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）A
High sulphur content fuelB
High lube oil temperaturesC
High vanadium content fuelD
Excessive piston slap
考题
单选题Which of the listed conditions can be considered as the single greatest cause of accidents?（）A
SpeedB
Excessive knowledge or skillC
Human errorD
Excitement
考题
单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
Low compression pressure and high exhaust temperatureB
Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
考题
单选题As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?（）A
Compression ratioB
Fuel/Air ratioC
Compression pressureD
Lube oil pressure
考题
单选题Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）A
TransducerB
ReducerC
TransformerD
Rectifier
考题
单选题As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）A
Exhaust temperaturesB
Raw water pressureC
Lube oil pressureD
Air box pressure
考题
单选题Which of the listed set of conditions indicates early fuel injection timing?（）A
Loss of engine power and high exhaust temperaturesB
Higher than normal firing pressure and low exhaust temperaturesC
High fuel consumption and high exhaust temperaturesD
Lower than normal compression pressure and high exhaust temperature
考题
单选题The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）A
speed, torque, and horsepower productionB
firing order, valve timing, and valve liftC
fuel consumption, efficiency, and cylinder pressureD
scavenge pressure, compression ratio, and exhaust pressure
考题
单选题Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?（）A
Keeps the refrigerated space coolerB
Reduces the efficiency of the plantC
Takes the load off the compressorD
Has no affect on the system
考题
单选题Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）A
Gravity siphon effectB
Higher vacuum in the second-stageC
Difference in brine density between first and second stagesD
lower pressure in first-stage
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单选题Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）A
Ball floatB
ThermostaticC
BimetallicD
Impulse
考题
单选题When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）A
Advanced ignitionB
Clogged air intakeC
Leaky exhaust valveD
High exhaust pressure
考题
单选题Which of the routine maintenance procedures listed is required for starting air receivers?（）A
over-speedingB
overloadC
low exhaust temperatureD
high crankcase pressure
考题
单选题Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）A
The condenser and the expansion valveB
The king valve and the solenoid valveC
The compressor and the expansion valveD
The condenser and the solenoid valve
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