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发布时间:2023-11-07 02:38:37

[单项选择]In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move()
A. up and draw in a fresh air charge
B. down to burn off fuel
C. down to compress the fuel air charge
D. up and force out the exhaust gases

更多"In a four-stroke/cycle diesel engin"的相关试题:

[单项选择]To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()
A. Speed limiting governor
B. Over-speed governor
C. Over-speed trip
D. Over-speed relay
[单项选择]Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in ()
A. an air bound fuel system
B. damage to cylinder heads and pistons
C. excessive fuel injection
D. excessive air valve lift
[单项选择]The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the ()
A. camshaft
B. crankshaft
C. governor
D. flywheel
[单项选择]Coolant can be lost from a diesel engine jacket cooling waster system by leakage from()
A. cylinder head cracks
B. piping joints
C. pump leaking
D. all of the above
[单项选择]The pH value of water in a diesel engine closed cooling water system should be maintained between ().
A. 60 to75
B. 80 to 95
C. 100 to 115
D. 120 to 135
[单项选择]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()
A. has little or no internal friction
B. has a lower effective compression ratio
C. operates with scavenge air under a positive pressure
D. operates without energy absorbing intake and exhaust strokes
[单项选择]The camshaft on a four-stroke/cycle diesel engine provides a means to operate the ().
A. fuel injectors
B. exhaust valves
C. intake valves
D. all of the above
[单项选择]Scavenging in a four-stroke/cycle diesel engine occurs during the ().
A. last part of the exhaust stroke, and the first part of the intake stroke
B. last part of the intake stroke only
C. early part of the injection stroke only
D. early part of the power stroke
[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]A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the ().
A. temperature of the exhaust gases
B. energy supplied to the turbocharger
C. air pressure to the intake manifold
D. purge of exhausted gases from the cylinders
[单项选择]In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to().
A. produce a scavenging effect in the combustion space
B. equalize cylinder and exhaust manifold pressures
C. alleviate the difference in valve size between the intake and exhaust
D. flush out condensate that collects after each compression stroke
[单项选择]A disadvantage of a two-stroke/cycle diesel engine is()
A. more power strokes per revolution
B. the use of scavenge air
C. more complicated valve gear
D. higher working temperature of the piston and cylinder
[单项选择]Immediately after starting a diesel engine, normal raw water and jacket water pressure are indicatedHowever, the jacket water temperature continues to rise, if there is no change in the sea temperature, you should suspect()
A. overloading in all cylinders
B. a jammed three-way thermostatic valve
C. chromate PH too low
D. a high level in the surge tank
[单项选择]A four-stroke/cycle, 1000horsepower diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperatureThe reason for the failure could be()
A. glazed liners or pistons
B. high lube oil pressure
C. excessive compression ratio
D. worn valve seats and valves
[单项选择]A piston in a four-stroke/cycle diesel engine makes four strokes during each ().
A. crankshaft revolution
B. mechanical cycle of operation
C. period of two combustion cycles
D. cycle of two events
[单项选择]If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be()
A. on the power stroke
B. on the exhaust stroke
C. at the end of the power stroke
D. at the start of the intake stroke
[单项选择]If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be().
A. 525 RPM
B. 775 RPM
C. 1550 RPM
D. 1800 RPM
[单项选择]In a four-stroke/cycle diesel engine, the camshaft rotates at ()
A. twice the crankshaft speed
B. half the crankshaft speed
C. the same speed as that of the crankshaft
D. a speed independent of that of the crankshaft

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