ILLUMINATION - Quiz

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/m²

3) What is the unit of luminous efficiency?

Lux Lumen Lumen/m² 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

5) What is the main advantage of coiled coil lamp?

High melting point Higher light output Low operating voltage Low power consumption