The GATE Grind

GATE 2025 ME – Question 30

Machine Design · Rolling and sliding contact bearings · 1 mark · Multiple choice

A shaft carries a helical spur gear. Which one of the following bearings can NOT be used to support it?

  1. Angular contact bearing
  2. Double-row ball bearing
  3. Straight roller bearing
  4. Tapered roller bearing

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Show answer and explanation

Correct answer: (C) Straight roller bearing

Explanation

A helical gear produces an axial thrust as well as a radial load. Angular contact, double-row ball and tapered roller bearings can all carry both. A straight (cylindrical) roller bearing carries only radial load and cannot take the thrust.