Diesel engine cylinder head test cocks are used to（）

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 . 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 . Spark plug B . Heat of compression C . Carburetor D . Glow ping

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 leaking seal ring B . heat transfer from exhaust valves C . restricted cooling passages D . overheated intake valve

A . graphite packing B . sealing compound C . lubricating oil D . gasket

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

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

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 . turbocharger B . injection nozzle tip C . carburetor D . fuel oil pum

A . check cylinder lubrication B . connect the pressure indicator pressure C . test cylinder heads D . connect the exhaust gas pyrometer

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 . operated manually once an hour B . operated until the engine has started C . placed into operation only at maximum load D . adjustable to meet lubrication requirement

A . sea water B . fine mineral oil C . sanitary water D . fresh water

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