reducing exhaust gas velocity
increasing the frequency of gas vibration
the use of long head pipes
the use of zinc electrodes
第1题：
In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?
A.Noise coming from that air starting valve
B.Continuous operation of the starting air compressor
C.Zero air pressure in the air starting system
D.Overheated starting air pipe to the cylinder head
第2题：
principle
principal
cause
case
第3题：
When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work
A.remains the same
B.is reduced
C.is increased
D.is eliminated
第4题：
remains the same
is reduced
is increased
is eliminated
第5题：
cylinders
exhaust valves
pistons
fuel valves
第6题：
A sudden noise of a fire-engine made him（）to the door.
Ahurrying
Bhurried
Churry
Dto hurry
第7题：
030 to 1
300 to 1
333 to 1
330 to 1
第8题：
Lubrication for the main reduction gears used with diesel engines is usually supplied by
A.oil from the main engine sump
B.an independent lube oil system
C.the stern bearing head tank
D.the stem bearing sump tank
第9题：
a reduction
an increase
an outing
a downwards
第10题：
ignition lag
engine horsepower
lube oil system pressure
specific fuel consumption