Q.

The resistance in a thyrite lightning arrester is

  • AVaries linearly with the applied voltage 
  • BIncreases with the applied voltage 
  • CDecreases linearly with the applied voltage
  • Dhigh at low current and low at high current 
Correct Answer : (D)

high at low current and low at high current 

Hints :

Thyrite lightning arrester

 

Thyrite lightning arrester is most commonly used for the protection against high dangerous voltages. When lightning takes place, voltage is raised and breakdown of the gap occurs, the resistance falls to a very low value and wave is discharged to earth. After the surge has passed the thyrite again comes back to its original position and there is no chemical change occurring simultaneously.

The resistance in a thyrite lightning arrester is high at low current and low at high current.

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