單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題The ability of a fuel particle to travel into the combustion chamber before burning is called ().

A.penetration
B.permanence
C.turbulence
D.atomization

3.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Which statement about diesel engine combustion is true?()

A.Combustion does not begin until the piston starts down on the power stroke
B.Maximum combustion pressure is reached before TDC
C.Turbulence in the cylinder causes a delay in ignition
D.Maximum cylinder firing pressure is not developed until the piston passes TDC