engineering recuitment BSPHCL Technician (Electrician) 2024 Mock Test Utilization of Electrical Energy Illumination

एक सोडियम वाष्प लैंप की संदीप्ति दक्षता कितनी होती है?

1
40-50 लुमेन/वाट
2
50-100 लुमेन/वाट
3
120-200 लुमेन/वाट
4
10-12 लुमेन/वाट
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