Respuesta :
Order sequence of steps that are involved in the production of work by a four-stroke heat engine as follows:
- Piston moves down, allowing fuel-air mixture to enter intake valve
- Piston moves up, compressing gas and causing gas to increase its temperature
- Combustion as gas is still compressed; increase in energy from combustion pushes piston down
- Piston moves up, pushing burned gases through exhaust valve: Spark plug fires, causing
Answer: Options D, A, C and B
Explanation:
There are four basic steps of a four stroke engine- Intake, Combustion, Power and Exhaust. The first step is the intake of air plus fuel mixture in the combustion chamber. At this time, the piston moves down. Now when the chamber is closed, the spark plug ignites fire which expands the fuel gases.
The gases push down, piston and crankshaft rotates in this way. Once the gases the combustion is done, there is plenty of space in the chamber that makes the piston moves up. In this way a complete cycle is completed and the crankshaft moves. That’s the working of this four stroke engines.
Answer:
Correct order for the four strokes in a four stroke engine is as follow:
1.(D) Piston moves down, allowing fuel-air mixture to enter intake valve
2.(A) Piston moves up, compressing gas and causing gas to increase its temperature
3.(C) Spark plug fires,causing combustion as gas is still compressed; increase in energy from combustion pushes piston down
4.(B) Piston moves up, pushing burned gases through exhaust valve
Explanation:
In a four stroke engine, four strokes takes place one after other to produce energy or power.
Correct order for these four strokes is given above that is
1. Piston moves down allowing fuel-air mixture to enter from intake valve. Actually moving down of piston creates a vacuum,that infact pulls fuel-air mixture from intake valve
2. Piston moves up causing compression, and due to compression temperature of mixture(fuel+air) increases
3. At the end of 2nd Stroke Spark Plug fires , and the mixture of compressed gases is combusted releasing energy, due to enegy release piston moves downward
4. Piston again moves upward causing burnt gases to move out from exhaust valve.
