"Heat Engine" Mechanical energy, internal energy and their conversion PPT courseware 5

Description

"Heat Engine" Mechanical energy, internal energy and their conversion PPT courseware 5

Explanation: When a gasoline engine is working, four strokes start over and over again. However, only the third stroke does work externally. The remaining three strokes are auxiliary strokes, which are driven by the inertia of the large flywheel mounted on the crankshaft.

Think about it:

Which machines in life use gasoline engines?

Summary

Heat engine: A device that converts internal energy into mechanical energy in the form of work.

Internal combustion engine: Internal combustion engine is the most common heat engine; gasoline engine and diesel engine are the most common internal combustion engines.

Four-stroke gasoline engine: structure (intake valve, exhaust valve, spark plug, cylinder, piston, connecting rod, crankshaft)

Working principle: The four strokes of suction stroke, compression stroke, power stroke and exhaust stroke are a working process, and then cycle.

Class exercises:

1. During the compression stroke of a gasoline engine, the working material is compressed, and the... ． ( )

A. Pressure increases and temperature decreases B. The pressure decreases and the temperature increases;

C. As the pressure increases, the temperature increases; D. pressure decreases, temperature decreases

2. According to the difference between gasoline engines and diesel engines, which of the following statements is correct? ． ( )

A. There is a spark plug on the top of the cylinder of a gasoline engine, and a fuel injector on the top of the cylinder of a diesel engine.

B. The gasoline engine inhales air, and the diesel engine inhales a mixture of air and diesel.

C. The suction stroke is the conversion of internal energy into mechanical energy. D. The compression stroke is the conversion of internal energy into mechanical energy.

3. The flywheel speed of a four-stroke internal combustion engine is 1800 rad/min, and it completes in 1 s ( )

A. 30 strokes, done 30 times of work B. 60 strokes, done 60 times of work

C.120 strokes, doing 30 times of work D.60 strokes, doing 15 times of work

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For more information about the PPT courseware "Thermal Engine Mechanical Energy Internal Energy and Its Transformation", please click the Thermal Engine ppt Mechanical Energy Internal Energy and Its Transformation ppt tag.

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Update Time: 2024-11-21

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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