题目内容

The time between injection and ignition of the fuel is known as ____.

A. turbulence lag
B. after burning ratio
C. pre-ignition lag
D. ignition delay

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The fuel injector injects a fine spray of fuel into the hot air and combustion _____, producing much high pressure in the gases.

A. has begun
B. takes place
C. occur
D. happen

The injector pump is operated by a cam which drives the _____ up and down.

A. needle valve
B. plunger
C. piston
D. cylinder

VIT means___________.

A. Variable Injection Timing
B. Variable Inlet Tonnage
C. Vertical Incoming Tonnage
D. Vertical Inlet Tank

Proper filtering and straining of diesel fuel is important because the _____.

A. fuel oil pump will over-speed if dirt is not removed
B. fuel oil transfer pumps cannot tolerate small amounts of grit in the oil
C. fuel injectors may be damaged by foreign particles in the fuel oil
D. dirty fuel will clog the intake air filter

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