Rajkamal Sir (Engineers Platform) 📚📚

1. A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed two meters away, the electrons emitted by the photocathode. [SSC JE EE 2021]

4. If d∅ is the luminous flux incident normally on an area dA, then Illuminance is given as: [SSC JE EE 2021]

3. For indoor lighting the ratio of space: height is………….[SSC JE EE 2021]

2. Lamp efficiency is measured in………………..[SSC JE EE 2021]

1. The candle power of a lamp placed normal to a working plane is 60 CP. Find the distance if the illumination is 15 lux. [SSC JE EE 2021]

4. The total quantity of light energy emitted per second from a luminous body is defined as: [SSC JE EE 2020]

3. __________ is the angle generated by a surface passing through a point in space and a periphery of the area. [SSC JE EE 2020]

2._____ is a form of electromagnetic energy radiated from a body which is capable of being perceived by the human eye.

1. Which of the following statements is NOT true for discharge lamps with regard to metal filament lamps?