單項選擇題In describing engine operation, what does the term “cycle” mean?()

A.The sequence of events that produce a power pulse
B.One rotation of the engine crankshaft
C.One stroke of a piston
D.All of the above


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1.單項選擇題An advantage of aluminum pistons, when compared to cast iron pistons is ().

A.greater high temperature strength
B.better heat conductivity
C.greater weight per cubic inch
D.increased resistance to wear

3.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

4.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

5.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