Question

The ascending order of strokes in the four-stroke engine is

• A. Suction stroke – Expansion stroke – Compression stroke – Exhaust stroke
• B. Suction stroke – Compression stroke – Expansion stroke – Exhaust stroke
• C. Suction stroke – Expansion stroke – Exhaust stroke – Compression stroke
• D. Suction stroke – Compression stroke – Exhaust stroke – Expansion stroke

Answer 1

The correct option is B

Suction stroke – Compression stroke – Expansion stroke – Exhaust stroke

The Correct Answer of Above question is:-

The Correct Answer is Option B

Suction stroke – Compression stroke – Expansion stroke – Exhaust stroke

Petrol engines:

1.The fourth stroke has four sequence steps from intake, Compression, power, to exhaust.

2.Each equates to one full stroke of the piston.

3.therefore it supplies one power stroke for every two cycle of piston and a complete cycle requires two resolutions.

There are basically four processes in a four-stroke engine.

Suction or intake stroke:

1. In this process, the air-fuel mixture is sucked inside the cylinder by the backward movement of the piston.
2. This process is indicated as 0-1 in the diagram above.

Compression stroke:

1. During this process, the mixture is compressed adiabatically.
2. This process is shown as 1-2.
3. After this process, heat is added by a spark plug from 2-3.

Expansion stroke or power stroke:

1. During this process, we get power output from the engine.
2. This process is shown in figures by points 3-4.

Exhaust or heat rejection stroke:

1. This stroke comes at the last of the cycle.
2. And follows the path 4-1-0 in the figure.
3. The exhaust stroke occurs when residual gases expelled from the combusion chamber are librated into atmosphere.
4. The exhaust stroke is the concluding stroke and takes Place when the exhaust value is open and intake value is closed.
5. Piston move liberates exhaust gases into the atmosphere.

Thus, the correct option is option B.