In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）

A . turn engine with jacking gear B . drain filters and strainers and bleed off water at each injection pump C . use ether to start the engine with blow-down valves open D . blow through the cylinders and fuel lines with a drying agent

A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

A . top of the ring groove B . cylinder liner oil film C . bottom of the ring groove D . back of the ring groove

A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

A . clogged filters B . poor combustion C . overloading of the diesel D . shock of fuel line

A . before TDC and close after BDC B . after TDC and close after BDC C . before TDC and close before BDC D . after TDC and close before BDC

A . a gravity tank B . a sump C . a vessel D . a bottle

A . low oil pressure B . high coolant pressure C . leaking fuel injector D . cracked cylinder head or liner

A . High jacket water pressure B . High lube oil pressure C . Low lube oil pressure D . Excessive turbo charger speed

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 . cam followers B . push rods C . combustion gases D . valve spring

A . metal particles loosened by wear B . air when no air cleaners are used C . condensation of water vapors D . breakdown of the lubricating oil by dilutio

A . compensate for low oil level B . increase governor promptness C . prevent governor hunting D . limit engine load

A . acidity of the oil B . pour point of the oil C . flash point of the oil D . viscosity of the oil

A . valve guides B . oil control rings C . valve seats D . compression ring

A . governor droop B . speeder spring tension C . fuel rack lag D . load on the engine

A . immediately open all crankcase relief ports B . increase crankcase exhauster speed to draw cool air into the engine C . allow the engine to cool naturally D . increase crank case scavenge air to remove unburned gase

A . twice the crankshaft speed B . half the crankshaft speed C . the same speed as that of the crankshaft D . a speed independent of that of the crankshaft

A . air turbulence B . fuel penetration C . fuel spray angle D . fuel injection rate

A . engine to the bed B . rocker arm to the camshaft C . crankshaft to the gear train D . piston to the crankshaft

A . a reduction B . an increase C . an outing D . a downward

A . The direction of pressure on the journal in four-stroke engine is continuously B . positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C . four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D . Low-stroke engines usually consume less lube oil than four-stroke engine

A . as much fuel as B . less fuel than C . less fuel as D . more fuel tha

A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

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