Which are the three types of shaft-to-shaft power transmission?

• A. Belt drive, chain drive, gear drive
• B. Shaft coupling, belt tensioner, pulley
• C. Direct drive, belt slip, gear-less
• D. Rotor, stator, coupling

Answer: (A)

Power is moved between rotating shafts using three main mechanical methods: belt drives, chain drives, and gear drives. A belt drive uses a belt around pulleys to transfer torque; it’s flexible and good for spacing or speed changes via pulley sizes, but can slip and wear over time. A chain drive uses a chain and sprockets for a positive, high-torque connection with less slip than belts, though it needs lubrication and careful alignment. A gear drive uses interlocking gears to transfer power with high efficiency and precise speed ratios in a compact setup, but requires accurate alignment and can be heavier or more expensive. These three are the standard shaft-to-shaft power transmission options, rather than components like couplings or configurations that don’t define the primary transmission method.