Which term refers to proper tightness of a belt?

• A. Pillow Block Bearing
• B. Lubrication
• C. Alignment
• D. Belt Tension

Answer: (D)

Belt tension is the term for how tight a belt should be. In a belt-driven system, getting the tension right ensures the belt stays firmly in contact with the pulleys so power can be transmitted efficiently. If the belt is too loose, it will slip under load, reducing torque, causing heat and uneven wear. If it’s too tight, the extra load on bearings, shafts, and the belt itself can shorten life and cause noise or premature failure. Setting the correct tension usually follows the manufacturer’s specification and is checked by measuring deflection or using a tension gauge, then rechecked after the system has run to account for stretch. The other terms refer to different aspects of the drive (support for the shaft, reducing friction, or keeping the pulleys aligned) and don’t describe how tight the belt should be.