更多"In a four-stroke engines the camsha"的相关试题:
[单项选择]In a four-stroke engine the camshaft rotates at （）.
A. half the engine speed
B. twice the engine speed
C. the engine speed
D. four times the engine speed
[单项选择]Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）
A. filtering
B. centrifuging
C. depositing
D. operating
[单项选择]The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）
A. one half crankshaft speed in a two-stroke cycle diesel engine
B. crankshaft speed in a two-stroke cycle diesel engine
C. two times crankshaft speed in a two-stroke cycle diesel engine
D. one-fourth times crankshaft speed in a four-stroke cycle diesel engine
[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]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]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]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]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]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]Advise you（）engines．
A. stop
B. to stop
C. stopping
D. stopped
[单项选择]Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）
A. camshaft beatings
B. main bearings
C. piston crowns
D. cylinder walls
[单项选择]Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.
A. cylinder liners and piston rings
B. main bearings
C. crankpin bearings
D. turboblower
[单项选择]Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of （） to develop their full strength.
A. the piston rods
B. the crank throws
C. the thrust bearings
D. the main bearings
[单项选择]Auxiliary diesel engines can be automatically shut down as a result of （）
A. low lube oil temperature
B. low lube oil pressure
C. high exhaust temperature
D. high cooling water pressure
[单项选择]Diesel engines obtain combustion air through turbo chargers，blowers，or（）.
A. air starters
B. carburetors
C. natural aspiration
D. air receivers
