单项选择题

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

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单项选择题

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

单项选择题

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