轮机英语船舶电气与船舶安全单项选择题每日一练(2019.01.20)

单项选择题
In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）
A.compression stroke
B.suction stroke
C.expansion stroke
D.exhaust stroke
单项选择题
Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）
A.amount of scavenge air to the cylinder
B.quality of fuel injected
C.viscosity of the lube oil
D.compression ratio of the piston
单项选择题
Generator brushes are staggered to（）
A.reduce current pulsations
B.reduce brush chatter
C.prevent uneven commutator wear
D.allow greater power generation
单项选择题
The displacement of a ship is to the total weight, all told, of the relevant loaded ship（）
A.larger
B.equal
C.smaller
D.equivalent
单项选择题
To determine that a compartment contains sufficient oxygen to sustain life, you should use a/an （）.
A.explosimeter
B.oxygen indicator
C.fresh air indicator
D.all of the above