单项选择题
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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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 -
单项选择题
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
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单项选择题
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
