更多"The rotating range of the low speed"的相关试题:
[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]As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate ().
A. the inlet valve
B. the outlet valve
C. both the inlet valve and the outlet valve
D. the pump inlet valve
[单项选择]A governor automatically controls engine speed by regulating ().
A. fuel supply
B. firing order
C. engine load
D. oil level
[单项选择]A change in engine speed is required before a governor is able to make a corrective movement of fuel rackThis aspect of governing is commonly expressed as a percent and is known as ()
A. governor sensitivity
B. governor promptness
C. speed droop
D. isochronous governing
[单项选择]The hydraulic () is used to control engine speed.
A. motor
B. pump
C. governor
D. capstan
[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 engine not obtaining the sufficient speed for firing” means that ().
A. the start fails
B. the fuel pumps will be put into operation
C. the fuel valves are damaged
D. the combustion process will take over
[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]Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during ().
A. the power stroke
B. the compression stroke
C. low load operation only
D. periods of standby
[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]As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?()
A. Compression ratio
B. Fuel/Air ratio
C. Compression pressure
D. Lube oil pressure
[单项选择]The minimum speed an engine must attain before ignition can occur depends upon ().
A. the type and size of the engine
B. the condition of the engine
C. ambient temperature
D. all of the above
[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]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