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Doctors Medicines MCQs Q&A

  1. Deflecting force
  2. Controlling force
  3. Damping force
  4. Restoring force
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1 Answers

Option 3 : Damping force

Concept:

There are three types of torques produced in an indicating instrument.

1.) Deflecting Torque:

  • The torque needed to move the pointer over a calibrated scale is known as deflecting torque.
  • The deflecting torque (Td) in the analog measurement device is proportional to the current through the coil.
     

2.) Controlling Torque:

  • The controlling torque (Tc) opposes the deflecting torque and increases with the deflection of the moving system.
  • The pointer comes to rest at a position where the two opposing torques are equal.
  • Controlling torque is provided either by spring control or by gravity control.
     

3.) Damping Torque:

  • This torque is used to damp out the final oscillation produced in an indicating instrument.
  • Damping torque is provided either by eddy current, air friction, or fluid friction damping.
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