更多"An indication of a diesel engine ai"的相关试题:
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
[单项选择]Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A. exhaust gas pressure
B. exhaust gas temperature
C. speed
D. load
[单项选择]Cooling the intake air supplied to a diesel engine will （）.
A. reduce mean effective pressure
B. decrease average compression pressure
C. decrease air charge density
D. increase power output
[单项选择]A restricted air intake to a diesel engine may result in the engine （）.
A. failing to reach rated speed
B. knocking under maximum load
C. hunting or surging under light load
D. overspeeding and running away
[单项选择]Air blowing from the intake air filter of an operating air compressor indicates （）.
A. broken inlet valves
B. broken discharge valves
C. pulsations in the air distribution system
D. overloading of the air distribution system
[单项选择]It is abnormal that when the engine is being turned by the turning gear or by hand, （）.
A. water discharges from the indicator cocks
B. no water is leaking into crankcase
C. no water in the scavenge belt
D. the rpm is lower than the speed of Dead Slow Ahead
[单项选择]In a four-stroke cycle diesel engine the intake valves open （）
A. before TDC and close after BDC
B. after TDC and close after BDC
C. before TDC and close before BDC
D. after TDC and close before BDC
[单项选择]What is the effect of heated intake air on a diesel engine? （）
A. Increases efficiency
B. Increases engine horsepower
C. Increases engine life
D. Reduces engine horsepower
[单项选择]Before starting an engine by air, the engine must（）
A. be turned by a turning gear for at least one minute
B. be turned by a turning gear for at least two minutes
C. be turned at least one complete turn
D. be turned at least two complete turns
[单项选择]A turbocharged diesel engine will have an intake manifold pressure（）
A. constantly decreasing as engine load increase
B. constantly increasing as the amount of supercharging increases
C. approximately equal to exhaust manifold pressure at all times
D. approximately equal to atmospheric pressure at all times
[单项选择]The cetane rating of diesel fuel is an indication of the （）
A. ignition quality of the fuel
B. calorific value of the fuel
C. flash point of the fuel
D. rate of fuel consumption
[单项选择]Before starting the engine the air bottle should be （）.
A. pumped up
B. loaded
C. discharged
D. opened
[单项选择]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 temperature
B. Low firing pressure and high exhaust temperature
C. Low compression pressure and low exhaust temperature
D. Low firing pressure and low exhaust temperature
[单项选择]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.
A. downwards；upwards
B. upwards；downwards
C. downwards；downwards
D. upwards；upwards
[单项选择]When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）
A. suction stroke
B. compression stroke
C. power stroke
D. exhaust stroke
[单项选择]The intake valves in a diesel engine are reseated by （）.
A. cam followers
B. push rods
C. combustion gases
D. valve springs
[单项选择]If the engine does start on air, but combustion does not immediately begin, the cause may be （）.
A. failure of the fuel pumps
B. starting air pressure too low
C. stop valve in air line closed
D. the turning gear still engaged
