A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.

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

单项选择题All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）

A.Excessively early injection timing
B.Combustion knock
C.Leaking piston rings
D.Light load

单项选择题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