POE Gears, Pulley Drives, and Sprockets

A simple gear train is composed of three gears. Gear A is the driver and has 84 teeth, bear B has 60 teeth, and gear c has 20 teeth. If the output is gear C, what is the gear ratio?

• $\frac{5}{7}$

• $\frac{3}{1}$

• $\frac{5}{21}$

A simple gear train is composed of three gears. Gear A is the driver and has 84 teeth, bear B has 60 teeth, and gear c has 42 teeth. If gear C rotates at 60 rpm, how fast is gear a rotating?

• 120 rpm

• 30 rpm

• 60 rpm

• 90 rpm

A simple gear train is composed of three gears. Gear A is the driver and has 84 teeth, bear B has 60 teeth, and gear c has 42 teeth. If the output at gear C is 1200 ft. lb, what is the input torque at gear A?

• 600 ft lb

• 1200ft lb

• 1800 ft lb

• 2400 ft lb

A compound gear train is composed of four gears: A, B, C, and D. Gear A has 120 teeth. Gear B has 12 teeth and shares a shaft with gear C, which has 24 teeth. Gear C is meshed with gear D, the output gear. Power is supplied at gear A with 200 ft. lb of torque and is traveling at 400 rpm. The necessary torque output for the system is 1600 ft. lb. What should the gear ratio of the system be?

• $\frac{1}{8}$

• $\frac{8}{1}$

• $\frac{1}{2}$

• $\frac{2}{1}$

A compound gear train is composed of four gears: A, B, C, and D. Gear A has 120 teeth. Gear B has 12 teeth and shares a shaft with gear C, which has 24 teeth. Gear C is meshed with gear D, the output gear. Power is supplied at gear A with 200 ft. lb of torque and is traveling at 400 rpm. With a torque output of 1600 ft lb, how many teeth should gear D have?

• 256

• 512

• 1024

• 1920

A compound gear train is composed of four gears: A, B, C, and D. Gear A has 120 teeth. Gear B has 12 teeth and shares a shaft with gear C, which has 24 teeth. Gear C is meshed with gear D, the output gear. Power is supplied at gear A with 200 ft. lb of torque and is traveling at 400 rpm. With a system output of 400 ft lb, how many teeth should gear D have?

• 256

• 480

• 720

• 900

In a pulley system, pulley A is moving at 600 rpm and has a diameter of 12 in. Three pulleys B, C, and D, all of different sizes are attached to a single output shaft. Speed and torque output are changed within the system by moving the drive belt between pulleys B, C, and D. A speed of 1200 rpm is required when the drive belt is connected to pulley B. What is the diameter of pulley B?

• 2

• 4

• 6

• 8

In a pulley system, pulley A is moving at 600 rpm and has a diameter of 12 in. Three pulleys B, C, and D, all of different sizes are attached to a single output shaft. Speed and torque output are changed within the system by moving the drive belt between pulleys B, C, and D. A speed of 800 rpm is required when the drive belt is connected to pulley C. What is the diameter of pulley C?

• 3

• 6

• 9

• 12

In a pulley system, pulley A is moving at 600 rpm and has a diameter of 12 in. Three pulleys B, C, and D, all of different sizes are attached to a single output shaft. Speed and torque output are changed within the system by moving the drive belt between pulleys B, C, and D. A speed of 400 rpm is required when the drive belt is connected to pulley D. What is the diameter of pulley D?

• 9

• 12

• 15

• 18

A mountain bike has a sprocket and chain drive system designed to adjust the force needed by an operator. The system consists of one sprocket driven by the pedals with a diameter of 10 inches, and a second on the back wheel with a diameter of 6.5 inches. What is the overall system gear ratio?

• 1.54

• .64