举一反三
- Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
- One of the differences between a two-stroke engine and a four-stroke engine is,（） A: a two-stroke engine works without exhaust operation B: a two-stroke engine works without compression stroke C: a two-stroke engine works without expansion stroke D: a two-stroke engine works without suction operatio
- 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
- In the four-stroke engine, it takes( )to make one<br/>power stroke() A: one propulsion B: two propulsions. C: two revolutions D: one revolution
- It is a verified fact that the higher ____<br/>of a two-stroke engine, the higher _____. A: the engine efficiency…the<br/>stroke/bore ratio B: the stroke/bore ratio…the<br/>engine efficiency C: the bore / stroke ratio…the<br/>engine efficiency D: the engine efficiency…the<br/>bore / stroke ratio
内容
- 0
In a two-stroke engine that uses a camshaft, each valve is opened _____ for every rotation of the crankshaft; in these engines, the camshaft rotates at the same speed as the crankshaft.In a four-stroke engine, the valves are opened only half as often; thus, _____ of the crankshaft occur for each rotation of the camshaft. A: once ... two full rotations B: twice ...two full rotations C: once ... one full rotation D: twice ... one full rotation
- 1
A diesel engine piston ring face is in direct contact with the （）.
- 2
If the detergent type lubricating oil being used in a diesel engine is black, the oil （） A: must be centrifuged B: must by filtered C: must be changed D: is holding finely dispersed carbon in suspensio
- 3
If a four-stroke/cycle diesel engine is running at 1550 RPM， the speed of the camshaft will be（）.
- 4
The two-stroke cycle begins with the piston coming up from the bottom of its stroke， with scavenge ports in the sides of the cylinder being （）.