单项选择题
A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.
A.crankshaft revolution
B.mechanical cycle of operation
C.period of two combustion cycles
D.cycle of two events
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单项选择题
The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the （）.
A.control rack
B.delivery valve
C.governor speed
D.plunger crossbar -
单项选择题
The ability of a fuel particle to travel into the combustion chamber before burning is called （）.
A.penetration
B.permanence
C.turbulence
D.atomization -
单项选择题
Proper atomization of fuel in diesel engine combustion chambers will （）.
A.affect the injection pressure
B.improve combustion
C.reduce compression pressure
D.decrease power output
