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Doctors Medicines MCQs Q&A

  1. They are not subject to much fatigue
  2. They are magnetic in nature
  3. They have high temperature resistance coefficient
  4. They have high temperature resistance
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1 Answers

Option 1 : They are not subject to much fatigue

Torques in Indicating Instruments:

There are three types of torque present in an indicating instrument. These are:

  1. Deflection Torque
  2. Controlling Torque
  3. Damping Torque
     

Controlling torque in an indicating instrument is produced either by spring or by gravity control.

The spring used must possess the following properties:

  • It should not be subjected to fatigue.
  • It should be non-magnetic.
  • It should have a low-temperature coefficient.
  • It should have low specific resistance.

Therefore, option 1 is correct.

 Damping torque used in an indicating instrument is either eddy current damping or air friction damping.

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