更多"Poor combustion in a diesel engine "的相关试题:
[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 pressure
[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]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]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]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 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]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]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]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]Diesel engine piston seizure can be caused by （）
A. poor cooling of cylinder walls
B. improper cooling of the piston
C. insufficient piston lubrication
D. all of the above
[单项选择]Low compression in a diesel engine can be caused by （）
A. clogged coolant passages
B. a leaking cylinder head gasket
C. low fuel oil pressure
D. worn or broken cylinder liner sealing rings
[单项选择]Diesel engine lube oil can become contaminated as a result（）
A. the water produced during combustion
B. the sulfur in the fuel
C. unburned fuel oil
D. all of the above
[单项选择]A diesel engine piston crown can crack from （）
A. excessive piston to liner clearance
B. excessive dirt beneath the piston crown that reduces heat transfer
C. faulty nozzle spray
D. all of the above
[单项选择]Diesel engine exhaust noise can be reduced in an exhaust muffler by （）
A. changing the direction of exhaust gas flow
B. increasing the exhaust gas velocity
C. changing the exhaust gas weight
D. increasing the exhaust gas static pressure
[单项选择]A diesel engine cylinder head can crack as a result of （）
A. a leaking seal ring
B. heat transfer from exhaust valves
C. restricted cooling passages
D. overheated intake valves
[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
[单项选择]What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）
A. Rapid increase in temperature with constant pressure
B. Rapid increase in pressure with constant temperature
C. Rapid increase in pressure and temperature
D. Rapid increase in volume and decrease in pressure
