_____ is a semi-circular key used for transmitting light torque.

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ALP CBT 2 Fitter Official Paper: Held on 21 Jan 2019 Shift 2
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  1. Gib head key 
  2. Feather key 
  3. Woodruff key 
  4. Saddle key 

Answer (Detailed Solution Below)

Option 3 : Woodruff key 
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Detailed Solution

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Explanation:

Classification of keys:                                                       

Woodruff key

  • This is semicircular key and it fits on to the shaft on which matching recesses are cut.
  • The top portion of the key projects out and fits in the keyway cut on the hub. 
  • This key is particularly useful on tapered fittings of shafts. 
  • It is a semicircular key used for transmitting light torque.

Hollow saddle key

  • One face of this key has a curvature to match with that of the shaft surface.
  • It has a taper of 1 in 100 and is driven in through the keyway.
  • The hub is held on the shaft due to friction.
  • This key is useful only for light duty transmission.

Parallel key or feather key

  • This is the most commonly used key, used for transmitting unidirectional torque.

Taper and jib-headed key

  • It is used for transmitting more torque.
  • It is not good for high-speed applications.

Flat saddle key

  • This is considered to be stronger than the hollow saddle key.
  • This is not suitable for heavy duty transmission.

 

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