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单选题
An increase in diesel engine crankcase pressure generally indicates excessive()
A
compression pressure
B
lube oil header pressure
C
scavenge air pressure
D
piston ring blow-by
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compressed airB
electricityC
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单选题If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?()A
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The sump lube oil scavenge pump should be secured immediatelyC
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单选题Excessive diesel engine back pressure may be an indication of ()A
carbon buildup in the exhaust manifoldB
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eroded muffler baffle platesD
high injection pressure
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单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of ()A
free entry of air to the crankcaseB
water entering the crankcase while engine wash-downs are being performedC
excessive oil leakage during periods of increased blow-byD
sub-cooling internal components
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单选题What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?()A
Rapid increase in temperature with constant pressureB
Rapid increase in pressure with constant temperatureC
Rapid increase in pressure and temperatureD
Rapid increase in volume and decrease in pressure
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单选题In a diesel engine, blow-by is generally the result of worn()A
valve guidesB
oil control ringsC
valve seatsD
compression rings
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单选题An increase in crankcase pressure generally indicates()A
worn connecting rod bearingsB
worn engine cylinder linersC
high cylinder firing pressureD
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单选题Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring()A
back clearanceB
side clearanceC
gap clearanceD
taper clearance
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单选题In a diesel engine, blow-by()A
increase exhaust back pressureB
causes excessive crankcase pressureC
can only be detected by a compression checkD
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单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because ()A
bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedB
bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedC
the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineD
two-stoke/cycle diesel engines require more complicated lubrication piping
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单选题A turbocharged diesel engine will have an intake manifold pressure()A
constantly decreasing as engine load increaseB
constantly increasing as the amount of supercharging increasesC
approximately equal to exhaust manifold pressure at all timesD
approximately equal to atmospheric pressure at all times
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单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and()A
immediately open all crankcase relief portsB
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单选题A naturally aspirated diesel engine at full throttle will have an intake manifold pressure ()A
slightly less than atmospheric pressureB
approximately equal to exhaust manifold pressure at all timesC
that is widely fluctuating constantlyD
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单选题If cooling water flow through the after-cooler is interrupted,the power output of a turbocharged diesel engine will drop because the ()A
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单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will ().A
reduce engine horsepower outputB
aid in silencing the exhaust noiseC
increase the mean effective pressureD
contribute to effective cylinder scavenging
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单选题An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in ()A
exhaustB
air box pressureC
brake main effective pressureD
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单选题A diesel engine crankcase ventilation system ()A
prevents spark generationB
removes combustible gasesC
determines the level of combustible gasesD
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单选题The most common instrument used to measure diesel engine exhaust pressure is the ()A
pyrometerB
bourdon gaugeC
pneumercatorD
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考题
单选题How dose water enter the crankcase of a diesel engine?()A
Through the crankcase exhausterB
As water vapor contained in blow-byC
Demulsifying lube oil passing through the main bearingsD
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单选题An increase in the air inlet manifold pressure of a diesel engine will result in a/an ().A
decrease in maximum cylinder pressureB
increase in ignition lagC
decrease in fuel consumption per horsepower-hourD
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单选题If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?()A
Open the crankcase immediately to check for damageB
Apply fire fighting water through the crankcase breatherC
Allow the engine to cool before opening the crankcaseD
Assume that there is no damage to the crankshaft
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