Mercury vapour black lights may be extinguished if the supply voltage drops below about:

M

Mr. Dubey • 52.30K Points
Coach

Q. Mercury vapour black lights may be extinguished if the supply voltage drops below about:

(A) 120 volts

(B) 90 volts

(C) 220 volts

(D) 200 volts

Correct : Option (D)

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