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IC Engine Practice Test: Electronic Injection Systems
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Avg score: 30% • Most missed: “Manifold _____________ is eliminated due to the fuel being injected into or clos…”
Electronic Injection Systems topics include: Gasoline injection, electronic injection system, electronic control systems, injection timing and group gasoline injection system. Here are some basics of an electronic injection system: Fuel pump: Located inside the fuel tank, the fuel pump works when the engine is starting and running. Injectors: The injection system places the injectors in the right position to deliver fuel directly to the cylinders. This improves fuel efficiency and torque without increasing the engine size. Fuel filter: An integral part of the injection system, the fuel... Show more
IC Engine Practice Test: Electronic Injection Systems
Time left 00:00
25 Questions

1. Multi-point fuel injection system uses ____________
2. As the temperature is low, the _____________ valve speeds up the engine idle speed to fast idling.
3. Continuous injection system usually has ___________
4. The electronic fuel injection, eliminates majority of carburettor pressure loses and almost eliminates the requirement of manifold heating.
5. By using EFI system we get ___________
6. In D-MPFI system, the vacuum in the intake manifold is first sensed.
7. In the four cylinder engine, the ECU calculates the appropriate injection timing for each cylinder and the air fuel mixture is made available at each suction stroke.
8. The ECU in the electronic control system, receives signals from the sensors and determines the opening time for the injectors land which also controls the injection volume.
9. In an electronic fuel injection, position of the injection unit is critical.
10. In _____________ cylinder, the piston moves up from BDC to TDC during the exhaust stroke.
11. The duration of injection time is controlled by a timing switch.
12. L-MPFI system uses ___________
13. In an electronic fuel injection, variation of air-fuel ratio is almost negligible even when the vehicle takes different positions like turning, moving on gradients, uneven roads, etc.
14. Just before the piston reaches TDC during exhaust stroke, injection of the fuel takes place into the inlet manifold of the cylinder at about 60º crankangle before TDC.
15. _____________ senor senses the amount of oxygen in the engine exhaust and calculates air-fuel ratio.
16. A thermo wax valve operates depending on the temperature of the engine coolant.
17. _____________ of fuel is independent of cranking speed and therefore starting will be easier.
18. In an electronic fuel injection, the servicing is very ___________
19. The Multi-Point Fuel Injection system can be functionally divided into _____________
20. The _____________ sensor, senses rotation of engine camshaft for speed and timing of injection.
21. The inputs used in electronically controlled diesel fuel injection systems are _____________
22. In electronic fuel injection, there is improvement in the _____________ efficiency due to comparatively less resistance in the intake manifolds which will cause less pressure losses.
23. The _____________ sensor, is a microphone type sensor that detects ping or pre-ignition noise so that the ignition timing can be retarded.
24. By means of EFI systems one can achieve the precise control of ___________
25. The timing of injection has to be advanced as the speed _____________

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