The process to remove exhaust gases by...

单项选择题The process to remove exhaust gases by blowing in fresh air is called （）.

A.charging
B.supercharging
C.starting
D.scavenging

1.单项选择题The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.

A.behind
B.far from
C.adjacent to
D.in front of

2.单项选择题The primary duty of lube oil is to reduce （） between the working parts of an engine.

A.power output
B.friction and wear
C.indicated pressure
D.rated horsepower

3.单项选择题The pressurized air is usually cooled to increase the charge air （）.

A.viscosity
B.density
C.velocity
D.electricity

4.单项选择题The pressure of pilot air is usually （） than that of starting air.

A.higher
B.lower
C.low
D.high

5.单项选择题The power generated in the turbine must （） that required by the compressor.

A.be less than
B.be larger than
C.be as large as
D.not be so large as

6.单项选择题The position of the piston parts in relation to each other is secured by means of （） and a dowel pin in the crown.

A.bosses
B.through bolts
C.machine-turned recesses
D.long studs

7.单项选择题The position of the piston parts in relation to each other is secured by means of （） in the crown.

A.a mark
B.a bolt
C.a dowel pin
D.a measuring tool

8.单项选择题The position of the interface between oil and water within the centrifuge is achieved by the use of （）.

A.gravity disc
B.centrifugal bowl
C.a stack of discs
D.main sealing ring

9.单项选择题The position of （） on the crosshead on a large diesel engine is determined by dowel pins.

A.the guideway
B.the piston rod
C.the crosshead shoes
D.the interlocked circlip

10.单项选择题The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.

A.the scavenging air
B.the exhaust gases
C.the mixed air
D.the spray oil