更多"In an internal combustion engine, w"的相关试题:
[单项选择]In a modern internal combustion diesel engine, the load carrying part of the engine is referred to as the（）
A. bedplate or base
B. sump or oil pan
C. cylinder block
D. frame
[单项选择]Internal combustion engine crankcase vent outlets must be equipped with （）
A. hinged rain guards
B. corrosion resistant flame screens
C. dipsticks for measuring oil levels
D. crankcase ventilation fans
[单项选择]The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.
A. air bottle
B. air compressor
C. crank case
D. combustion chamber
[单项选择]Which statement about diesel engine combustion is true?（）
A. Combustion does not begin until the piston starts down on the power stroke
B. Maximum combustion pressure is reached before TDC
C. Turbulence in the cylinder causes a delay in ignition
D. Maximum cylinder firing pressure is not developed until the piston passes TDC
[单项选择]A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.
A. slow-speed diesel
B. medium-speed diesel
C. high-speed diesel
D. constant-speed diesel
[单项选择]Theoretical perfect combustion in a diesel engine yields by-products of （）.
A. aldehydes and carbon dioxide
B. water vapor and carbon monoxide
C. nitrogen and carbon monoxide
D. water vapor and carbon dioxide
[单项选择]Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）
A. residual carbon deposits
B. lube oil viscosity breakdown
C. uneven heat expansion of the rings
D. uneven heat expansion of the piston
[单项选择]Poor combustion in a diesel engine can be caused by （）.
A. high compression pressure
B. low intake air temperature
C. low exhaust pressure
D. high scavenge air temperature
[单项选择]Combustion knock occurring in a diesel engine can be caused by （）
A. low coolant temperature
B. insufficient fuel
C. high ambient temperature
D. carbon buildup on the injector tips
[单项选择]A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.
A. double-acting engine
B. opposed pistons engine
C. single-acting engine
D. horizontal acting engine
[单项选择]After finished the engine, which of valves cannot be shut off by the duty engineer?（）
A. fuel valve
B. the starting air valve
C. the sea chest
D. the main sea pump inlet valve
[单项选择]In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）
A. noise coming from that air starting valve
B. continuous operation of the starting air compressor
C. zero air pressure in the air starting system
D. overheated starting air pipe to the cylinder head
[单项选择]Diesel engine blow-by is the leakage of combustion gases past the （）
A. oil rings only
B. compression and scraper rings
C. cylinder liner sealings
D. cylinder liner ring grooves
[单项选择]In a four stroke engine, which process lasts the longest period?（）
A. exhaust and suction process
B. suction and compression process
C. combustion and exhaust process
D. working and exhaust process
[单项选择]As for a diesel engine, lack of combustion air may be due to （）.
A. fouling turbine
B. fuel pump faults
C. lubrication failure
D. excessive cooling
[单项选择]The lowest temperature at which fuel combustion becomes self-sustaining in the presence of a source of ignition, is defined as the （）
A. auto-ignition point
B. flash point
C. burning temperature
D. fire point
[单项选择]Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection system?（）
A. Atomization
B. Metering
C. Effective stroke
D. Penetration
