engineering recuitment BSPHCL JE Electrical 2024 Mock Test Utilization of Electrical Energy Lamps and Bulbs

सोडियम वाष्प लैंप का औसत जीवनकाल कितना होता है?

1
लगभग 3,000 घंटे
2
लगभग 2,000 घंटे
3
लगभग 1,000 घंटे
4
लगभग 500 घंटे
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