Light Sources

Poll

How are you feeling?

Multiple Choice

An incandescent light bulb is filled with air.

• True

• False

Multiple Choice

Halogens are a group of non-metallic elements such as chlorine, fluorine, bromine, and iodine.

Because of the  __________ effect, the filament can operate at a higher temperature than regular filament lamps, which increases the light output

• generative

• lighting

• regenerative

• nulling

Multiple Choice

What are the two most common gases used in a gas discharge lamp?

• Hydrogen vapor and

  Nitrogen vapor

• Helium vapor and sodium vapor

• Mercury vapor and argon vapor

• Mercury vapor and sodium vapor

Multiple Choice

Fluorescence:- the re-radiation persists for a while even after the exciting source, i.e. the radiation, is removed

• True

• False

Multiple Choice

Fluorescent lamps contain ____________.

• Hydrogen vapor and

  Nitrogen vapor

• Helium vapor and sodium vapor

• Mercury vapor and argon vapor

• Mercury vapor and sodium vapor

Multiple Choice

A starter is needed in which type of fluorescent lamp?

• Slow start

• Quick start

• Switch start

• Mixed start

Multiple Choice

A High-Pressure Mercury Vapour lamp has an inner tube and an outer tube.

• True

• False

Multiple Choice

The inner tube of a High-Pressure Mercury Vapour Lamp has ___________ electrodes.

• 1

• 2

• 3

• 4

Multiple Choice

Metal Halide Lamps are more efficient than fluorescent lamps.

• True

• False

Multiple Choice

In the stroboscopic effect, the flickering occurs because the lights go off twice per cycle.

• True

• False

Fill in the Blank

Bonus Question: One type of lamp popular nowadays but not mentioned in the slides is a _____ lamp.