increased horsepower
reduced efficiency
increased heat loss
lower cylinder pressures
第1题：
vacuum pressure
specific gravity
heat
viscosity
第2题：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner
第3题：
Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?
A.compression must be low for effective spark ignition
B.compression must be low for required horsepower and torque generation
C.compression must be low to prevent pre-ignition
D.compression must be low to have effective pre-ignition
第4题：
overloading the engine
low exhaust valve lift
excessive cylinder cooling
insufficient mechanical clearance
第5题：
the expansion ratio will decrease
combustion will be slowed down
thermal efficiency will decrease
thermal efficiency will increase
第6题：
increase
decrease
remain the same
increase on compression decrease on expansion
第7题：
Decreased connecting rod bearing clearance
Increased connecting rod bearing clearance
Decreased compression ratio
Increased compression ratio
第8题：
Slow speed diesel engines
Medium-speed diesel engines
Steam engines
Gasoline engines
第9题：
increased horsepower
reduced efficiency
increased heat loss
lower cylinder pressures
第10题：
increase exhaust back pressure
causes excessive crankcase pressure
can only be detected by a compression check
decreases fuel consumption