This is the electrical engineering questions and answers section on "Electric Illumination" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
1. Melting temperature of tungsten is
Answer: Option D
Explanation:
3655°K
2. A zero watt lamp consumes
- A. no power
- B. about 5 to 7 W power
- C. about 15 to W power
- D. about 25 to 30 W power
Answer: Option B
Explanation:
about 5 to 7 W power
3. The output of a tungsten filament lamp depends on
- A. size of lamp
- B. size of shell
- C. temperature of filament
- D. all of the above
Answer: Option C
Explanation:
temperature of filament
4. Which bulb operates on lowest power ?
- A. Night bulb
- B. Neon bulb
- C. GLS bulb
- D. Torch bulb
Answer: Option D
Explanation:
Torch bulb
5. Which gas is sometimes used in filament lamps ?
- A. Argon
- B. Krypton
- C. Nitrogen
- D. Carbon dioxide
Answer: Option A
Explanation:
Argon
