In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as______________?
Correct answer: B. critical grid voltage
- A. maximum grid voltage
- B. critical grid voltage
- C. any of the above
- D. none of the above
Explanation
The minimum grid potential at which the anode-cathode arc can be initiated is called the critical grid voltage. Below this value, the grid cannot permit reliable arc striking.
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