Illumination. Part – 2

11. Luminous flux is

A. The light energy radiated by sun

B. The part of light energy radiated by sun, which is received on the earth

C. The rate of energy radiation in the form of light waves

D. None of the above

12. Leak transformer is sodium vapour lamp initially provides

A. High current

B. Low voltage

C. High voltage

D. None of the above

13. Bulbs in street lighting are all connected in

A. Parallel

B. Series

C. Series parallel

D. End to end

14. Power factor of electric bulb is

A. Zero

B. Lagging

C. Leading

D. Unity

15. Which method is used for the lighting calculations?

A. Watts per square meter method

B. Lumen or light flux method

C. Point to point method

D. All of these

16. Which among these tests are to be conducted on wiring installations?

A. Testing of polarity of non linked single pole switches

B. Testing of earth continuity path

C. Testing of earth resistance

D. All of these

17. Candela is the unit of

A. Luminous flux

B. Luminous intensity

C. Wavelength

D. None of the above

18. The unit of luminous flux is

A. Steradian

B. Candela

C. Lumen

D. Lux

19. Which of the following lamp has the highest efficiency?

A. HPSV

B. halogen lamps

C. metal halide

D. HPMV

20. How is the ballast resistance connected with the choke?

A. Parallel

B. Series

C. can be connected in either way

D. both (A) and (B)