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1) What is the term refers luminous flux given by light source per unit solid angle?
Lumen
Candela
Illuminance
Luminous intensity
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Correct Answer: Luminous intensity
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1) What is the term refers luminous flux given by light source per unit solid angle?
Lumen
Candela
Illuminance
Luminous intensity
2) What is the unit of luminous flux?
Lux
Lumen
Candela
Lumen/m<sup>2</sup>
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Correct Answer: Lumen
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2) What is the unit of luminous flux?
Lux
Lumen
Candela
Lumen/m<sup>2</sup>
3) What is the unit of luminous efficiency?
Lux
Lumen
Lumen/m<sup>2</sup>
Lumen/watt
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Correct Answer: Lumen/watt
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3) What is the unit of luminous efficiency?
Lux
Lumen
Lumen/m<sup>2</sup>
Lumen/watt
4) How the rate of evaporation in a vacuum bulb is reduced?
Filling inert gas
Producing arc in bulb
Reducing filament resistance
Increasing filament resistance
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Correct Answer: Filling inert gas
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4) How the rate of evaporation in a vacuum bulb is reduced?
Filling inert gas
Producing arc in bulb
Reducing filament resistance
Increasing filament resistance
5) What is the main advantage of coiled coil lamp?
High melting point
Higher light output
Low operating voltage
Low power consumption
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Correct Answer: Higher light output
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5) What is the main advantage of coiled coil lamp?
High melting point
Higher light output
Low operating voltage
Low power consumption
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