Gear Ratios: Torque & Speed

What is the primary function of torque in a motor?

• To determine the speed of the motor
• To create a twisting force for rotation
• To calculate the distance traveled
• To increase friction between the tires and the road

How is horsepower related to torque?

• Horsepower measures the speed of the motor only.
• Horsepower is the amount of torque needed to stop a moving car

• Horsepower is the rate of torque application.
• Horsepower is the amount of torque needed to accelerate a car

What is the formula to calculate horsepower?

• Horsepower = Torque + RPM
• Horsepower = Torque - RPM
• Horsepower = Torque x RPM
• Horsepower = Torque / RPM

Which statement about gear size and speed is true?

• larger gears spin faster becasue they create an optimum gear ratio

• larger gears spin faster becasue they are able to generate more leverage

• smaller gears spin faster because their smaller radius means less linear distrance to travel

• smaller gears spin faster because their lower weight makes it easier to spin them

If a driven gear has 40 teeth and the driver gear has 10 teeth, what is the gear ratio?

• 1:2
• 2:1
• 4:1
• 1:4

Which arrangement will increase torque?

• small driver gear and equal size driven gear

• large driver gear and smaller driven gear

• small driver gear and larger driven gear

• large driver gear and equal size driven gear

What is the significance of gear radius in torque output?

• A smaller radius is always better for torque.
• A larger radius decreases torque output.
• A larger radius increases leverage and torque output.
• Gear radius has no effect on torque.

A driven gear is spinning faster than the driver. What's going on here?

• the driver gear is smaller

• the driver gear is larger

• the driven gear has more teeth than the driver

• the driver gear has less teeth than the driven

In a manual transmission car, why do lower gears have higher gear ratio?

• To save gas

• To make sure the wheels spin faster

• To make turning easier in low gears

• To get the car going and increase acceleration

The increase in torque with larger gears is similar to what simple machine?

• Wedge

• Lever

• Inclined plane

• Screw