單項選擇題Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）

A.faulty combustion
B.excessive ring temperature
C.over lubrication
D.all of the above


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1.單項選擇題The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）

A.inlet nozzle ring
B.turbine wheel blade
C.diffuser passages
D.inlet vol

2.單項選擇題When attempting to restart a warm high-speed engine, which of the following reactions can you expect?（）

A.Excessive fuel
B.Higher than normal temperatures for star up
C.Longer starting periods
D.Higher than normal lube oil pressure

3.單項選擇題An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in （）

A.exhaust
B.air box pressure
C.brake main effective pressure
D.all of the above

4.單項選擇題Which of the following procedures should be carried out to permit the use of a crosshead engine with an inoperable after-cooler?（）

A.Bypass the after-cooler to operate at speed
B.Run at reduced speed until the cooler can be repaired or renewed
C.Switch to diesel fuel and run at full speed
D.Nothing need to be done due to the low heating value of heavy fuel

5.單項選擇題If cooling water flow through the after-cooler is interrupted,the power output of a turbocharged diesel engine will drop because the （）

A.turbocharger will stall
B.density of the air charge will decrease
C.scavenge effect will increase
D.exhaust pressure will increase