Automotive Engine Auxiliary Systems Multiple Choice Questions on “ Petrol Injection”.
1. Which among the following tunes the fuel delivery to achieve the correct fuel ratio?
a) Float valve
b) Ecu
c) Oxygen sensor
d) Temperature sensor
Answer: b
Clarification: The ECU uses the information from the sensors to fine-tune the fuel delivery to achieve the just correct fuel ratio. The sensors monitor the mass of air entering the engine and also the amount of oxygen in the exhaust.
2. Which among the following is defined as the amount of time the injector stays open and also determines the amount of fuel supplied to the engine?
a) Flat spot
b) Pulse radiation
c) Pulse width
d) Dark pulse
Answer: c
Clarification: The amount of time the injector stays open determines the amount of fuel supplied to the engine it is called the pulse width. This time duration and the amount of fuel flowing into the combustion chamber is controlled by the ECU.
3. Which among the following is not a factor affecting the pulse width?
a) Coolant temperature
b) Oxygen level in the exhaust
c) Base pulse width
d) Muffler explosion
Answer: d
Clarification: The factors affecting the pulse width are the base pulse width, the coolant temperature and the factors for oxygen level in the exhaust.Whereas the muffler explosion takes place due to the unburnt fuel In the engine, which completes its combustion in the muffler.
4. Which type of control valve is used in the operation of the injector?
a) Mechanical
b) Electrical
c) Pneumatic
d) Hydraulic
Answer: b
Clarification: The Petrol is injected by an electronically controlled valve, called an injector. The injector has nozzles on its circumference through which the petrol or gasoline is sprayed into the combustion chamber which is controlled by the ECU.
5. Which among the following is not an advantage of petrol injection?
a) Fuel consumption is less
b) Rapid response to throttle
c) High-quality fuel distribution
d) Low efficiency
Answer: d
Clarification: The advantages of petrol injection are high-quality fuel distribution, fuel consumption is less, the engine to throttle control is very rapid, etc. Whereas the petrol injection system provides more efficiency.
6. Which of the following is not a component of a petrol injection system?
a) Injection pump
b) Injection nozzle
c) Pipelines
d) Compression ring
Answer: d
Clarification: The injector is made up of a precise fuel injection pump, injection nozzle through the fuel enters the combustion chamber and pipelines are provided for each cylinder. Whereas the compression ring has no part in the petrol injection system.
7. How is the air-fuel mixture for full power mode?
a) Rich
b) Lean
c) Stoichiometric
d) Very lean
Answer: a
Clarification: Fuel – air mixture is made richer in the full power mode and the fuel is sprayed in during the intake stroke which is controlled by the ECU. The ECU controls the amount of fuel injected based upon the airflow into the engine.
8. Where is the injector placed in the direct injection system?
a) Intake manifold
b) Next to the inlet valve
c) Inside the cylinder
d) Near the throttle body