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Control grid is given ________

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in Electrical Measurements by (148k points)
Control grid is given ________

(a) positive voltage

(b) negative voltage

(c) neutral voltage

(d) zero voltage

This question was addressed to me in an online interview.

Query is from Cathode Ray Tube topic in division Oscilloscopes of Electrical Measurements

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Right answer is (b) negative voltage

For explanation I would say: Grid controls the amount of electrons falling on the fluorescent screen of a cathode ray tube. Cathode ray tube is provided with a negative voltage with respect to the cathode as a reference.

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