Sources of Light MCQ - Electrician (Set-1) with Answers

Sources of Light MCQ - Electrician (Set-1) with Answers

11) Gas-discharge lamps take some time in illuminating fully. Which of the following lamps takes comparatively more time in illuminating fully ?

Answer is:

Sodium vapour lamp

12) What is the temperature at which a gas filled tungsten filament lamp operates ?

Answer is:

2300 degree C

13) When a fluorescent lamp shows a dense blackening at each end, it could possibly mean that the :

Answer is:

starter is working improperly

14) The advantage of a preheat fluorescent lamp as compared to incandescent lamp is that it :

Answer is:

generally has a longer life

15) How many lamps of 3 volts rating are required to be connected in series to a supply of 200 V for satisfactory operation ?

Answer is:

67