(1) only is correct
(2) only is correct
both (1) and (2) are correct
Neither (1) or (2) are correct
第1题：
A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.
A.increasing the linear velocity of the exhaust gases
B.changing directions of exhaust gas flow
C.decreasing the temperature of the exhaust gases
D.accelerating the exhaust gas through a reduced size orifice
第2题：
Immediately after any diesel engine is started, the engineer should check the ______.
A.crankcase pressure
B.lube oil pressure
C.saltwater pressure
D.exhaust temperature
第3题：
High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).
A.decreased piston to cylinder head clearance
B.increased exhaust system back pressure
C.early fuel injection timing
D.low scavenge air temperature
第4题：
high compression pressure
low intake air temperature
low exhaust pressure
high scavenge air temperature
第5题：
stop the engine immediately to prevent damage
increase lube oil pressure
slow the engine allowing it to gradually cool
decrease the cooling water it temperature to the water jacket
第6题：
A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke
A.①
B.②
C.① and ②
D.Neither ① nor ② is correct
第7题：
natural aspiration
masked intake valves
air cells
scavenging air
第8题：
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by
A.natural aspiration
B.masked intake valves
C.air ceils
D.scavenging air
第9题：
reduce lube oil temperature
raise exhaust temperature reduce
excessive heating of engine room
reduce load on cooling water pump
第10题：
air binding of the engine cooling system
a cracked water cooled exhaust manifold
blockage in the heat exchanger
faulty operation of the thermostat