Gears, pulleys, and sprocket systems

The more teeth that there are on the second gear, the less it turns.

• True

• False

A simple gear train system consists of four gears. Gear A has 82 teeth, gear B has 18 teeth, gear C has 28 teeth, and gear D has 42 teeth. What is the gear ratio?

• .32:1

• .51:1

• 1.95:1

• .34:1

A simple gear train system consists of four gears. Gear A has 82 teeth, gear B has 18 teeth, gear C has 28 teeth, and gear D has 42 teeth. What is the output torque if a is turning at 1250 ft-lbs?

• 640.24 ft-lb

• 2440.47 ft-lb

• 425.82 ft-lb

• 3660.71 ft-lb

Which gear would be best for travelling the fastest on flat ground?

• High gear would be best.

• Low gear would be best.

What is missing from pulley drive gear ratios that is present in other gear ratio scenarios?

• Angular Velocity (rpm)
• Torque (ft lb)
• Diameter (in)
• Number of Teeth

A compound gear train is composed of four gears, A, B, C, and D. Gear A has 8 teeth and is meshed with gear B. Gear B has 24 teeth and shares a shaft with gear C, which has 18 teeth. Gear C is meshed with gear D, the output gear. Power is supplied at gear A with 30 ft·lb of torque. The necessary torque output for the system is 1080 ft·lb. What should the gear ratio of the system be?

• 288:1

• 2.7:1

• 27.7:1

• 36:1

A compound gear train is composed of four gears, A, B, C, and D. Gear A has 8 teeth and is meshed with gear B. Gear B has 24 teeth and shares a shaft with gear C, which has 18 teeth. Gear C is meshed with gear D, the output gear. Power is supplied to gear A with 30 ft·lb of torque. The necessary torque output for the system is 1080 ft·lb. How many teeth should gear D have?

• 81 n

• 216 n

• 288 n

• 144 n

If the same compound gear train system has 75 teeth at gear D, which is spinning at 125 rpm, how fast is gear A turning?

• 1562.5 rpm

• 10.5 rpm

• 1171.87 rpm

• 13.33 rpm

Which of the following is an incorrectly written portion of the gear ratio formula?

• N out/N in
• W out/W in
• D out/D in
• T out/T in

When a drive gear is smaller than the driven gear the result is....

• More Speed
• More Torque
• Less Torque
• More Angle