opposed to the crankshaft rocking couple
resonant with the crankshaft natural frequency
critical fore and aft crankshaft vibrations
horizontal whipping motions of the crankshaft
第1题：
the extra weight required for the diesel reduction gearing
a minimum speed for the engines that limits the minimum speed of the vessel
the higher fuel consumption per SHP
the low efficiency of the system when a controllable pitch propeller is used
第2题：
remains the same
is reduced
is increased
is eliminated
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：
moving the governor control to stop
shutting off the lubricating oil supply
tripping the governor emergency stop lever
shutting off the fuel supply
第5题：
Ⅰ + Ⅱ
Ⅰ ~ Ⅲ
Ⅰ ~ Ⅳ
Ⅰ + Ⅱ + Ⅳ
第6题：
Slow speed diesel engines
Medium-speed diesel engines
Steam engines
Gasoline engines
第7题：
top of the ring groove
back of the ring groove
bottom of the ring groove
piston ring end clearance
第8题：
In reducing engine speed to an efficient propeller speed by the use of reduction gears, _______.
A.speed and torque are both reduced
B.speed is reduced and torque remains unchanged
C.speed is reduced and torque is increased
D.speed is sometimes unchanged while torque is increased
第9题：
runs out of fuel
has low lubricating oil pressure
exceeds a set maximum speed
has high cooling water temperature
第10题：
slow-speed diesel
medium-speed diesel
high-speed diesel
constant-speed diesel