更多"As to the low speed diesel engine, "的相关试题:
[单项选择]The rotating range of the low speed diesel engine is usually lower than （）.
A. 100 rpm
B. 200 rpm
C. 300 rpm
D. 500 rpm
[单项选择]On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
A. dial indicator
B. outside caliper
C. bridge gauge
D. tram rod
[单项选择]In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）
A. build up the piston crown by metal spraying
B. build up the cylinder head by metal spraying
C. insert shims between the crankpin bearing box and the connecting rod foot
D. install a thinner head gasket
[单项选择]In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）
A. top of the ring groove
B. back of the ring groove
C. bottom of the ring groove
D. piston ring end clearance
[单项选择]A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
A. cylinder heads
B. exhaust valves
C. scavenging air
D. injectors
[单项选择]On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the （）
A. accumulator spring compressor
B. balance piston
C. compensating needle valve
D. proportional piston
[单项选择]The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of （） rpm.
A. below 300
B. above 1200
C. between 300 to 1200
D. below 1200
[单项选择]A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）
A. engine overload
B. leaky valves
C. stuck or broken piston rings
D. low air injection pressure
[单项选择]A diesel engine is turned at normal cranking speed and no ignition occursThis could be the result of （）
A. low lube oil temperature
B. low starting air temperature
C. air bubbles in the fuel oil system
D. water in the starting air system
[单项选择]Low compression of diesel engine may result from （）
A. a worn cylinder
B. broken piston rings
C. any of A and B
D. none of the above
[单项选择]Low compression in a diesel engine could be caused by（）
A. worn or broken cylinder liner sealing rings
B. high cooling water temperature
C. worn or broken piston rings
D. low fuel oil pressure
[单项选择]Before starting a diesel engine, you should always（）
A. check the pyrometer readings
B. check the crankcase oil level
C. check the fuel oil strainers
D. clean the fuel system
[单项选择]Low compression pressure in a diesel engine may be the result of （）
A. insufficient fuel supply due to fuel pump valves sticking or leaking
B. excessive mechanical clearance between the piston crown and cylinder head
C. excessively worn fuel pump plunger
D. excessive exhaust back pressure
[单项选择]Low compression pressure in a diesel engine is caused by（）
A. low water in the expansion tank
B. improperly seated valves
C. low fuel oil pressure
D. worn or broken cylinder liner sealing rings
[单项选择]Low compression pressure in a diesel engine can be caused by（）
A. improperly seating intake valves
B. leaking cylinder liner seal rings
C. late fuel injection timing
D. carbon deposits on the piston
[单项选择]A diesel engine should not be operated at low loads for long periods of time because（）
A. heavy carbon deposits will buildup on the valves and in the exhaust
B. fuel dilution is increased at low load
C. exhaust valves may be damaged
D. all of the above
[单项选择]If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）
A. decrease until the engine speed increases
B. increase as the load increases
C. decrease as the load
D. increases remain unchanged
[单项选择]
In a medium speed diesel engine, a trunk type piston may be cooled by（）
Ⅰ.oil circulation though passages in the piston crown
Ⅱ.heat transfer through piston rings and liner wall
A. Ⅰ only
B. Ⅱ only
C. either Ⅰ or Ⅱ
D. neither Ⅰ or Ⅱ
