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单选题
（）the compression ratio, （） the proportion of the heat energy of the combustion turned into useful work at the crankshaft, other things being equal.
A
The high；the large
B
The higher；the larger
C
The lower；the larger
D
The low ；the large
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更多 “单选题（）the compression ratio, （） the proportion of the heat energy of the combustion turned into useful work at the crankshaft, other things being equal.A The high；the largeB The higher；the largerC The lower；the largerD The low ；the large” 相关考题
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Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?A.Control the amount of lube oil burned in the combustion chamberB.Transmit heat from the piston to the cylinder linerC.Prevent damage to ring groove inserts by acting as a heat damD.Dissipate combustion chamber gas pressure by channeling it through the ring gap
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Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?A.compression must be low for effective spark ignitionB.compression must be low for required horsepower and torque generationC.compression must be low to prevent pre-ignitionD.compression must be low to have effective pre-ignition
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Which statement is true about compression subnets?()
A. Compression subnets are turned on by default.B. Compression subnets advertise remote routes.C. Compression subnets are usually LAN-side subnets.D. Compression subnets are usually WAN-side subnets.
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Which statement is true about compression subnets?（）A、Compression subnets are turned on by default.B、Compression subnets advertise remote routes.C、Compression subnets are usually LAN-side subnets.D、Compression subnets are usually WAN-side subnets.
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You want to use RMAN to create compressed backups. Which statement is true about the compression algorithms that RMAN can use？（）A、 The BZIP2 compression algorithm consumes more CPU resources than the ZLIB compression algorithm.B、 The ZLIB compression algorithm consumes more CPU resources than the BZIP2 compression algorithm.C、 The ZLIB compression algorithm provides maximum compression and produces smaller backups than the BZIP2 compression algorithm.D、 Only the BZIP2 compression algorithm can be used to make compressed backups to disk.
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单选题The latent heat of evaporation is dissipated in the （） in a compression refrigeration system.A
evaporatorB
condenserC
expansion valveD
compressor
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单选题Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）A
increaseB
decreaseC
remain the sameD
increase on compression decrease on expansion
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单选题In a compression refrigeration plant the refrigerant flows from the expansion valve and through the （） where it absorbs heat from the space being cooled and becomes a gas or vapor.A
compressorB
condenserC
throttle valveD
evaporator
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单选题（）the compression ratio, （） the proportion of the heat energy of the combustion turned into useful work at the crankshaft, other things being equal.A
The high；the largeB
The higher；the largerC
The lower；the largerD
The low ；the large
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单选题Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?（）A
Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
Decreased compression ratioD
Increased compression ratio
考题
单选题Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）A
Control the amount of lube oil burned in the combustion chamberB
Transmit heat from the piston to the cylinder linerC
Prevent damage to ring groove inserts by acting as a heat damD
Dissipate combustion chamber gas pressure by channeling it through the ring gap
考题
单选题If the compression ratio is increased on any diesel engine, （）A
the expansion ratio will decreaseB
combustion will be slowed downC
thermal efficiency will decreaseD
thermal efficiency will increase
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单选题Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）A
increased horsepowerB
reduced efficiencyC
increased heat lossD
lower cylinder pressures
考题
单选题When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）A
overloading the engineB
low exhaust valve liftC
excessive cylinder coolingD
insufficient mechanical clearance
考题
单选题The function of the piston compression rings used in a diesel engine is to （）A
seal the space between the piston and linerB
transmit heat from the piston to the cylinder linerC
reduce the amount of combustion gas blow-byD
all of the above
考题
单选题The heat used to change a liquid to a vapor is called （）.A
latent heat of fusionB
latent heat of vaporizationC
specific heat of vaporizationD
latent heat of the gas
考题
单选题Indications of （）are loss in power and irregular running of the engine, high exhaust temperatures of corresponding unite, high local temperature in scavenge trunk, surging of turbocharger, and sparks and smoke emitted from scavenge drains.A
a crankcase explosionB
a scavenge fireC
abnormal compression ratio
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For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?（）A
An increase in compression ratio will increase the ignition lagB
An increase in compression ratio will decrease the ignition lagC
A decrease in compression ratio will decrease the ignition lagD
A decrease in ignition lag will increase the compression ratio
考题
单选题The ignition quality of a fuel oil is an important operational consideration because it（）A
indicates the amount of abrasive material in the fuelB
affects the starting ability of a cold engineC
determines the amount of fuel penetration engineD
affects the compression ratio of an operating engine
考题
单选题Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）A
compression must be low for effective spark ignitionB
compression must be low for required horsepower and torque generationC
compression must be low to prevent pre-ignitionD
compression must be low to have effective pre-ignition
考题
单选题You want to use RMAN to create compressed backups.Which statement is true about the compression algorithms that RMAN can use?（）A
The BZIP2 compression algorithm consumes more CPU resources than the ZLIB compression algorithm.B
The ZLIB compression algorithm consumes more CPU resources than the BZIP2 compression algorithm.C
The ZLIB compression algorithm provides maximum compression and produces smaller backups than the BZIP2 compression algorithm.D
Only the BZIP2 compression algorithm can be used to make compressed backups to disk.
考题
单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
考题
单选题Piston compression rings used in a diesel engine function to （）A
transfer heat from the cylinder to the pistonB
scrape oil from the sides of the pistonC
seal the combustion space from the crankcasesD
prevent any piston contact with the cylinder liner
考题
单选题Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?（）A
Higher compression ratios create higher temperatureB
Higher temperatures create higher compression ratiosC
low temperatures create higher compression ratiosD
Higher compression ratios create low temperatures
考题
单选题Many cast iron pistons are designed with heat dams, which serve to （）A
keep piston crown temperatures elevated for smoother combustionB
reduce the possibility of overheating the top compression ringC
help retain the heat of compression to prevent ignition delayD
help retain the heat of compression to prevent combustion knock
考题
单选题If a diesel engines exhaust temperature is abnormally high, the cause could be（）A
too light of a loadB
injection timing is too earlyC
overloading of the engineD
too low of a compression ratio
考题
单选题Higher than normal temperature air passing through the intake of a diesel engine will result in（）A
greater overall efficiencyB
greater fuel economyC
lower horsepowerD
lower compression ratio
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