engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Utilization of Electrical Energy Lamps and Bulbs

एक प्रतिदीप्त ट्यूब का सामान्य कार्यकाल कितना होता है?

1
1,000 hr
2
2,000 hr
3
7,500 hr
4
10,000 hr
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