Gears Explained - mechanical engineering

The video tutorial explains the basics of gear operation, focusing on the relationship between gear size, speed, and torque. It uses examples like bicycles and cars to illustrate how different gears affect movement. The concept of torque is explained with practical examples, such as using a wrench. The tutorial also covers gear ratios, direction of rotation, and introduces compound gear trains, explaining how they can be used to manipulate speed and torque efficiently.

Why is it difficult to start pedaling a bicycle in a high gear?

• High gear provides high speed but low torque.

• High gear provides low speed but high torque.

• High gear is meant for uphill cycling.

• High gear is only used for braking.

What happens to the driven gear if it is half the diameter of the driver gear?

• It rotates twice as fast as the driver gear.

• It rotates slower than the driver gear.

• It does not rotate at all.

• It rotates at the same speed as the driver gear.

What is the purpose of an idler gear in a gear train?

• To increase the speed of the output gear.

• To change the direction of rotation.

• To decrease the torque of the output gear.

• To connect two gears of the same size.

How do you calculate the ratio in a gear system?

• Multiply the torque of the input gear by the output gear.

• Subtract the number of teeth of the input gear from the output gear.

• Divide the RPM of the input gear by the output gear.

• Divide the number of teeth of the output gear by the input gear.

If gear A has 8 teeth and gear B has 10 teeth, what is the gear ratio?

• 0.8

• 1.25

• 1.5

• 2.0

What happens to the torque when the gear ratio is increased?

• Torque decreases.

• Torque remains the same.

• Torque increases.

• Torque becomes zero.

In a compound gear train, what remains constant between two gears sharing the same shaft?

• Direction of rotation

• Number of teeth

• Torque

• Speed