AE & JE EE Quiz: Utilization and Electrical Energy Booster Quiz-1

If the distance from the source becomes half, what will be the effect on illumination?

Carbon arc lamps are commonly used in _____________.

  A normal illumination is kept in library around-

The light of fluorescent tube appears cooler than that from an incandescent lamp. This is due that fact that:

The correct relation between Brightness (L), Illumination (E), and Luminous intensity (I) of a uniform sphere?

___________ is the total quantity of radiant energy per second responsible for visual sensation from a luminous body.

A 230 V lamp has a total flux of 2,000 lumens and takes a current of 0.4348 A . Calculate the value of lumens per watt (i.e., efficiency of the lamp).

According to Laws of Illumination, which of the following is not TRUE.

The candle power of a lamp placed normal to a working plane is 60 cp. Find the distance if the illumination is 15 lux.

Luminous efficiency of a fluorescent tube is