Which term reduces speed and increases torque?

• A. Gear Reducer
• B. Sprocket
• C. Belt Tension
• D. Pneumatics

Answer: (A)

Speed is reduced and torque is increased when power is transmitted through a gear ratio. A gear reducer is designed to do exactly this: it takes the high-speed, lower-torque input and produces a slower output with higher torque. The output speed is the input speed divided by the gear ratio, and the output torque is the input torque times the gear ratio (multiplied by efficiency to account for losses). For example, a 10:1 reduction would give about one-tenth the speed while boosting torque roughly tenfold (minus losses). This deliberate change in speed and torque is the defining purpose of a gear reducer.

Sprockets with a chain can change speed and torque too, but they’re components of a drive system rather than a device specifically designed to reduce speed and amplify torque in a predictable, labeled way. Belt tension affects drive stability and traction in belt drives, not the basic speed-torque relationship. Pneumatics relies on compressed air and does not inherently provide a fixed speed-and-torque reduction like a gear reducer.