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4. Which of the following lamps does NOT suffer from stroboscopic effect? [SSC JE EE 2021]
3. In a fluorescent tube circuit high voltage surge is produced by
2. The unit of luminous flux is [SSC JE EE 2018]
1. A solid angle can be expressed in terms of [SSC JE EE 2018]
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5. The space to height ratio in illumination lies between [SSC JE EE 2018]
4. Which of the following will need lowest level of illumination? [SSC JE EE 2018]
3. Radiant efficiency of a luminous source depends on on………..[SSC JE EE 2021]
2. Lux is unit of which physical quantity? [SSC JE EE 2018]
1. A lamp having mean spherical candle power of 800 is suspended at a height of 10 m. Calculate the illumination just below the lamp.
[SSC JE EE 2014]
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5. Halogen lamps have the advantage(s) of: [SSC JE EE 2021]
4. In the electric discharge lamps, the light is produced by:
3. The luminous efficiency of a sodium vapour lamp is: [SSC JE EE 2018]
3. The luminous efficiency of a sodium vapour lamp is: [SSC JE EE 2018]
