A diesel engine cylinder head can crack as a result of （）

A . prolong the ignition delay period B . ensure the beginning of fuel injection C . thoroughly utilize the air charge D . allow controlled fuel combustio

A . air intake B . a fuel outlet C . cooling water inlets D . exhausting combustion ga

A . a shortened ignition delay period B . a lean fuel/air mixture C . excess fuel in the combustion chamber D . rapid vaporization of injected fuel droplet

A . fine atomization B . high temperature C . good mixing of fuel and air D . all of the above

A . produce the heat for ignition B . decrease injection lag C . increase ignition delay D . aid in exhausting burnt gase

A . the exhaust will be clear B . fuel consumption will be low C . all the fuel will be burned at top dead center D . fuel consumption will be high

A . the piston is just coming upward from the bottom dead center B . the piston has moved about one-fifth of the way up C . the piston has moved most of the way up and almost reached the TDC D . the piston has just past the TDC

A . swept volume of the cylinder B . inside diameter of the cylinder C . piston displacement in the cylinder D . length of the piston stroke

A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

A . intake valves B . carburetor C . exhaust ports D . injector nozzle

A . a leaking fuel injection nozzle B . a clogged air filter C . early fuel injection D . burned valve

A . a leaking fuel injector nozzle B . a clogged air filter C . excessively early fuel injection D . malfunctioning valve

A . blows out the exhaust gases B . supplies oxygen for combustion C . cools the valves and cylinder walls D . all of the above

A . chemical analysis B . back pressure readings C . pyrometer readings D . infrared analysi

A . Pressure and temperature decrease B . Pressure and temperature increase C . Pressure decreases and temperature increases D . Pressure increases and temperature decrease

A . a leaking fuel injector nozzle B . a clogged air filter C . excessively early fuel injection D . malfunctioning valve

A . liquid in the cylinder B . low compression in the cylinder C . high exhaust temperature D . poor fuel penetratio

A . increase back pressure during the exhaust process B . facilitate periodic replacement of the valves C . reduce the pumping loss associated with scavenging D . reduce tension on valve spring

A . lower thermal expansion rates than wet liners B . greater heat transfer rate than wet liners C . greater wear resistance than wet liners D . procedure to replace dry liners is simpler than for wet liner

A . starting the engine hot B . knurling the piston skirt C . operating an overheated engine D . using scuff resistant piston ring

A . the firing pressure in the cylinder B . a metering helix inside the pump C . varying the physical length of the plunger stroke D . varying the clearance between the injector cam and the injector rocker arm

A . Cylinder head valves B . Ports C . Turbo chargers D . Bleeder valve

A . at TDC B . before TDC C . after TDC D . during air starting