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Questions and Answers
What are the four strokes involved in the thermodynamic cycle of a four-stroke petrol engine?
What are the four strokes involved in the thermodynamic cycle of a four-stroke petrol engine?
The four strokes are: Suction Stroke, Compression Stroke, Expansion Stroke (Power Stroke), and Exhaust Stroke.
Describe the main function of the suction stroke in a four-stroke petrol engine.
Describe the main function of the suction stroke in a four-stroke petrol engine.
The suction stroke draws air-fuel mixture into the engine from Top Dead Center to Bottom Dead Center.
What is the compression ratio and temperature range during the compression stroke of a four-stroke petrol engine?
What is the compression ratio and temperature range during the compression stroke of a four-stroke petrol engine?
The compression ratio ranges from 250° C to 350° C with a temperature between 6 to 12 kg/cm².
Who is credited with the invention of the four-stroke petrol engine and in what year was it invented?
Who is credited with the invention of the four-stroke petrol engine and in what year was it invented?
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Explain the transition of the piston during the compression stroke of a four-stroke petrol engine.
Explain the transition of the piston during the compression stroke of a four-stroke petrol engine.
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Study Notes
Four Stroke Petrol Engine
- The four-stroke petrol engine was invented in 1870 by German scientist Nikulloux Otto.
- The engine cycle consists of four strokes: suction, compression, expansion (power), and exhaust.
- During the suction stroke, the piston travels from Top Dead Center (T.D.C) to Bottom Dead Center (B.D.C). The inlet valve opens, allowing air and fuel to enter the cylinder. The engine is typically started with an electric motor.
- During the compression stroke, both the inlet and exhaust valves are closed, and the piston moves from B.D.C to T.D.C, compressing the air-fuel mixture.
- The compression ratio is within the range of 6 to 12 kg/cm². The temperature of the compressed mixture increases significantly, reaching 250°C to 350°C.
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Description
Explore the mechanics of the four-stroke petrol engine, invented by Nikulloux Otto in 1870. This quiz covers the four distinct strokes: suction, compression, expansion, and exhaust, detailing how each contributes to the engine's operation. Understand the significance of compression ratios and temperature variations in the engine cycle.
