(1) only
(2) only
both (1) and (2)
neither (1) nor (2)
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