ENGINE AUXILIARY SYSTEMS| Interview questions | Automobile Engineering

What is Gasoline Direct Injection?

The gasoline (petrol) is directly into the cylinder at the end of compression stroke as such in diesel engines. This is called Gasoline Direct Injection (GDI)


What is conventional ignition system?

The conventional ignition system gets its electrical voltage either from battery or dynamo, which will be boosted to a very high voltage due to which spark is produced in the cylinder to combust the mixture.


Define common rail injection system.

A common rail which is maintaining high fuel pressure is connected to individual fuel injectors of a multi cylinder engine



What is unit injection system?

It is an integrated direct fuel injection system for diesel engines, combining the injector nozzle and the injection pump in a single component



What is a rotary distributor?

The rotary distributor has a rotating element, which releases a high intensity spark to the individual spark plugs according to the engine firing order.



What is the function of a spark plug?

The spark plug is a device to produce electric spark to ignite the compressed air-fuel mixture inside the cylinder.



What is an Electronic ignition system?

The ignition system, in which the mechanical contact points are replaced by electronic triggering and switching devices, is known as electronic ignition system.



What are the functions of Turbo chargers?

• To produce more power from the same size engine.

• To provide the altitude compensation.

• To improve more complete combustion & hence less emissions.



Why the engine emissions to be controlled?

Some of the engine emissions are carcinogenic. Moreover, the engine emissions led to green house effect. For these reasons, the engine emissions need to be controlled.



What are the advantages of petrol injection?

• High power can be developed.

• It has quick starting characteristics.

• It has lowest specific fuel consumption.

• Less engine emissions than carbureted engines.


 

ENGINE AUXILIARY


What is super charging?

The process of increasing the density of inducted charge/ air is known as supercharging. It is performed for the following reasons.

• To produce more power from the same size engine.

• To provide the altitude compensation.

• To improve more complete combustion & hence less emissions.



What is meant by carburetion in I.C engine?

The method of preparing the air-fuel mixture in an IC engine is known as carburetion. The device used for this purpose is known as carburetor.



What are the advantages of electronic fuel injection system over conventional injection?

• Cold starting is easier.

• High fuel economy.

• Less engine emissions.

• Quick response to varying engine operating conditions.



What are the functions of generator and starting motor?

The function of the generator is to produce electricity to charge the battery. The starting motor is used to crank the engine during the starting condition.



What is the function of an ignition system in I.C engine?

The function of an ignition system is to ignite the air-fuel mixture at the end of the compression stroke.


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