Question

these steps are involved in the production of work by a four - stroke heat engine. place the steps in the correct order. piston moves up, compressing gas and causing gas to increase its temperature. piston moves up, pushing burned gases through exhaust valve. spark plug fires, causing combustion as gas is still compressed; increase in energy from combustion pushes piston down. piston moves down, allowing fuel - air mixture to enter intake valve.

Explanation:

The four - stroke cycle starts with the intake stroke where the piston moves down to let in the fuel - air mixture. Then comes the compression stroke where the piston moves up to compress the gas and raise its temperature. After that, the spark plug fires during the power stroke, causing combustion and pushing the piston down. Finally, in the exhaust stroke, the piston moves up to push out the burned gases.

Answer:

1. Piston moves down, allowing fuel - air mixture to enter intake valve.
2. Piston moves up, compressing gas and causing gas to increase its temperature.
3. Spark plug fires, causing combustion as gas is still compressed; increase in energy from combustion pushes piston down.
4. Piston moves up, pushing burned gases through exhaust valve.