單項選擇題Successful combustion inside the cylinders of a diesel engine is dependent upon （）.

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


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1.單項選擇題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

2.單項選擇題The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the （）.

A.turbocharger stalls
B.exhaust pressure increases
C.air charge density decreases
D.scavenge effect increases

3.單項選擇題The diameter of a piston is usually less at the crown than at the skirt, in order to （）.

A.facilitate the installation of piston rings
B.allow for the expansion of the piston during operation
C.prevent crankcase vapors from entering the combustion chamber
D.reduce wearing of the upper cylinder liner

4.單項選擇題The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

A.direct action of cam shaft
B.compressed air pressure
C.hydraulic “push rods”
D.direct action of the main piston moving down

5.單項選擇題

In a diesel engine, excessive cylinder liner wear will cause （）
(1) increased blow-by
(2) wear between the piston ring and groove

A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.neither (1) or (2) axe correct