Mechanical Engineering Quiz

What is the gear ratio for a gear train with a 40-tooth driving gear and a 20-tooth driven gear?

• 0.2

• 0.5

• 1

• 2

In a gear train, if the input speed is 1000 RPM, the output speed for a gear ratio of 4 is:

• 250 RPM

• 400 RPM

• 1000 RPM

• 2000 RPM

What is the gear ratio of a gear pair with a 15-tooth driving gear and a 45-tooth driven gear?

• 0.25

• 3

• 15

• 45

If a gear system has an input power of 10 kW and an output power of 9 kW, what is the efficiency of the gear system?

• 80%

• 90%

• 100%

• 110%

In a gear system, if the input gear has 20 teeth and an input torque of 100 Nm. If the output gear has 40 teeth, what is the output torque?

• 50 Nm

• 100 Nm

• 200 Nm

• 400 Nm

For a gear train with an input speed of 1200 RPM and a gear ratio of 3, what is the output speed in RPM?

• 300 RPM

• 400 RPM

• 1200 RPM

• 3600 RPM

A gear system has an input power of 5 kW, and the gear ratio is 2. What is the output power?

• 2.5 kW

• 5 kW

• 10 kW

• 20 kW

In a gearbox, the input power is 6 kW, and the output power is 5.4 kW. What is the efficiency of the gearbox?

• 90%

• 100%

• 80%

• 75%

If a gear train with an input speed of 800 RPM achieves an output speed of 1600 RPM, what is the gear ratio?

• 0.5

• 1

• 2

• 3

A gear system has an input speed of 600 RPM and an input torque of 120 Nm. The output speed is 300 RPM. What is the output torque?

• 60 Nm

• 90 Nm

• 120 Nm

• 180 Nm