The Diesel engine works on

11) The Diesel engines are also known as?

Answer is:

Compression ignition (C.I) engines

Explanation:

The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to the mechanical compression. Hence diesel engines are also called as Compression ignition (C.I) engines.

12) For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle

Otto cycle is more efficient that Diesel cycle

Both Otto cycle and Diesel cycle are equally efficient

None of the above

Answer is:

Diesel cycle is more efficient than Otto cycle

Explanation:

For the same maximum pressure and temperature Diesel cycle is more efficient than Otto cycle.

13) In a Diesel engine, the fuel is ignited by

Answer is:

the heat of compression

Explanation:

The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to the mechanical compression. Hence diesel engines are also called as Compression ignition (C.I) engines.

14) A basic difference between the spark ignition engine and the Diesel engine is that the

Diesel engine compresses air alone instead of an air fuel mixture

air temperature ignites the fuel in the Diesel engine

fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C on the compression stroke

all of the above

Answer is:

all of the above

Explanation:

Spark Ignition Engines
1. It works on Otto Cycle which is also called as constant volume cycle.
2. Fuel used is petrol.
3. During the suction stroke itself the petrol is first admitted in to the carburettor, where it gets mixed with the air and then mixture enters the cylinder.
4. Air and petrol mixture is drawn during the suction stroke.
5. Low compression ration ranging from 7:1 to 12:1.
6. The compressed air and petrol is ignited by the spark plug. This type of ignition is called spark ignition.

Spark Ignition Engines
1. It works on Diesel Cycle which is also called as constant pressure cycle.
2. Fuel used is diesel.
3. The diesel oil is pressurised by the fuel pump and then injected into the engine cylinder by the fuel injector at the end of compression stroke.
4. Only air is drawn during the suction stroke.
5. High compression ratio ranging from 16:1 to 20:1.
6. The ignition of the diesel is accomplished by the compressed air which will have been heated due to high compression, to the temperature higher than the ignition temperature of the diesel. This type of ignition is called compression ignition or auto ignition.

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The Diesel engine works on

Diesel cycle

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Related Automobile Engineering MCQ with Answers

11) The Diesel engines are also known as?

Compression ignition (C.I) engines

12) For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle

13) In a Diesel engine, the fuel is ignited by

the heat of compression

14) A basic difference between the spark ignition engine and the Diesel engine is that the

all of the above

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