更多"In a four-stroke engine the camshaf"的相关试题:
[单项选择]In a four-stroke engines the camshaft rotates at （）.
A. half the engine rotational speed
B. twice the engine rotational speed
C. the engine rotational speed
D. four times the engine rotational speed
[单项选择]If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）
A. too low
B. a little lower
C. a little higher
D. exactly the same
[单项选择]If a diesel engine rotates slowly when cranked, but does not fire, the（）
A. fuel control rack had admitted excessive fuel
B. engine speed does not match the fuel rack setting
C. engine has failed to reach its firing speed
D. starter pinion and ring gear contact is not correct
[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
[单项选择]（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
A. An air receiver
B. An operating valve
C. An automatic valve
D. An air distributor
[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]The rotor of the hydraulic motor rotates at a speed proportional to the （）.
A. flow of oil
B. pressure of oil
C. A and B
D. temperature of oil
[单项选择]The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.
A. the oil separator
B. the fresh water generator
C. the compressor
D. fire pump
[单项选择]If a line at right angles to the axis rotates about that axis and, at the same time, moves parallel to the axis, it will generate （）.
A. a helix
B. a helicoidal
C. a curve
D. a cone
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
[单项选择]When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes （）.
A. a line
B. a circle
C. a helix
D. an epllicate
[单项选择]（） for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.
A. The driven gear
B. The drive
C. The grease
D. The lubricating oil
[单项选择]The speed of the camshaft in a two-stroke/cycle diesel engine, running at 950 RPM, is （）.
A. 475 RPM
B. 950 RPM
C. 1900 RPM
D. 2400 RPM
[单项选择]Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A. open the bypass line
B. cut in the lube oil cooler
C. pressurize the lube oil system
D. top off the expansion tank
[单项选择]If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
A. at each control station
B. in the chief engineer’s quarters
C. in the captains quarters
D. All of the above are correct
[单项选择]A diesel engine is similar to a gasoline engine except that the former has no （）.
A. cross-head
B. cylinder
C. connecting rod
D. spark plug
[单项选择]A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
A. as much fuel as
B. less fuel than
C. less fuel as
D. more fuel than
[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
