更多"In the four-stroke engine, it takes"的相关试题:
[单项选择]A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.
A. can’t be controlled very precisely
B. can’t be controlled as flexibly as the separate pump system
C. can be controlled as flexibly as the separate pump system
D. can be controlled more precisely and flexibly
[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]The engine has one or two group of fuel pumps, depending upon （）.
A. the number of fuel valves
B. the number of cylinders
C. the speed of engine
D. the power of engine
[单项选择]One engine manufacturer recommends heavy fuel oil should not be heated above 80℃ to 95℃ (176 ℉ TO 203℉) before purificationThis upper limit should be observed to ensure against（）
A. flattening of the bowl neoprene O-rings
B. operation within the explosive rang of the fuel
C. excessive purifier operating pressures
D. excessive oil viscosity
[单项选择]He said that he had turned the main engine one complete revolution with the （）.
A. turning gear
B. steering gear
C. spur gear
D. chain gear
[单项选择]If a diesel engine fails to start，one of the likely causes is （）
A. low compression temperature
B. low ambient air pressure
C. high lube oil pump pressure
D. high fuel oil booster pump pressure
[单项选择]One of function of diesel engine lubricating oil is to （）
A. induce carbon formation on cylinder walls
B. improve fuel penetration in the combustion space
C. form a friction reducing film between mating surfaces
D. lubricate the fuel injection
[单项选择]Be sure to make the engine turn by （） before starting and after stopping .
A. steering gear
B. turning gear
C. steering wheel
D. turning cycle
[单项选择]One cause of diesel engine surging can be a result of （）
A. injection pump plungers stuck or worn
B. low compression
C. solenoid stuck open
D. fuel tank too full
[单项选择]One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）
A. decrease in ignition lag
B. increase in fuel economy
C. reduction in lube oil viscosity
D. increase in cylinder misfiring
[单项选择]
In a diesel engine, an integral liner is one in which the cooling water （）
Ⅰ.flows through the cylinder liner jackets
Ⅱ.touches the outer side of the liner
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ and Ⅱ
[单项选择]One of the differences between a two-stroke engine and a four-stroke engine is,（）
A. a two-stroke engine works without exhaust operation
B. a two-stroke engine works without compression stroke
C. a two-stroke engine works without expansion stroke
D. a two-stroke engine works without suction operation
[单项选择]One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）
A. crankcase
B. piston
C. cylinder liner
D. crank cheek
[单项选择]What is one effect of running a diesel engine at too cool a temperature? （）
A. Buildup of sludge in the lubricating system
B. Excessive fuel consumption
C. Severe heat stresses on mechanical parts
D. Foaming of the lubricating oil
[单项选择]For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.
A. cylinder casing
B. cylinder bore
C. crankcase door
D. aperture in the cylinder block
[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]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
