The torque that can transmitted safely by the spur gear tooth at zero pitch line velocity is known as 

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ISRO LPSC Technical Assistant Mechanical 23 Feb 2020 Official Paper
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  1.  average torque 
  2. maximum torque
  3. minimum torque
  4. stalling torque

Answer (Detailed Solution Below)

Option 4 : stalling torque
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Detailed Solution

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Explanation:

Spur gear:

  • Spur gears are those gears in which teeth are straight and parallel to the axis of the shaft.
  • These types of gear are noisy, more fatigue, and have less life.
  • Spur gears are used for very low power transmission.

Stalling torque

Stalling torque is the torque produced by the spur gear tooth at zero pitch line velocity and it is the torque that produces maximum stress in the arm and teeth.

Design of arm of gear is done on the basis on stalling torque.

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