超星 - 题库第二章 - 查题吧

单选题

EFI supplies an accurate air/fuel _____ to the engine no matter what operating conditions are encountered.

A. proportion
B. scale
C. ratio
D. number

单选题

By delivering fuel directly at the back of the intake valve, the intake_____ design can be optimized to improve air velocity at the intake valve.

A. pipe
B. port
C. manifold
D. hose

单选题

The______ spark is generated outside the engine.

A. electric
B. eleven
C. excuse
D. electrical

单选题

Injecting the fuel______ in relation to the movement of the crankshaft.

A. at the right time
B. at the same time
C. in time
D. by time

单选题

The EFI system does not rely on any major adjustments for cold enrichment or fuel metering. Because the system is mechanically simple ,maintenance requirements are _______.

A. fortified
B. augmented
C. added
D. reduced

单选题

Any fuel that is not delivered to the ____manifold by the injector is returned to the tank through a fuel return pipe.

A. closed
B. open
C. exhaust
D. intake

单选题

During cold engines starting ,many engines incorporate a cold start injector designed to improve______below a specified coolant temperature.

A. stability
B. driveability
C. reliability
D. startability

单选题

The ECU____ the injector to deliver just enough fuel to achieve an ideal air/fuel ratio of 14.7:1.

A. send
B. site
C. cite
D. signals

单选题

The ______ has the job of supplying a combustible mixture of air and fuel to the engine.

A. staring system
B. cooling system
C. lubricating system
D. fuel system

单选题

The length of time that the ______ are open determines the amount of fuel that is sprayed into the engine.

A. sensors
B. filters
C. injectors
D. pipes

7