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Illumination
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ What percentage of the input energy is radiated by filament lamps ? 10 to 15 percent [other wrong options] [Discuss in forum] |
| Q2 ⇒ In ligting circuit using filament lamps 1% voltage drop results into 3.5 percent loss in the light output [other wrong options] [Discuss in forum] |
| Q3 ⇒ Which of the following instruments is used for the comparison of candle powers of different sources ? Photometer [other wrong options] [Discuss in forum] |
| Q4 ⇒ For precision work the illumination 'level required is of the order of  500-1000 lumens/m2 [other wrong options] [Discuss in forum] |
| Q5 ⇒ Which of the following bulbs operates on least power ? Torch bulb [other wrong options] [Discuss in forum] |
| Q6 ⇒ Co-efficient of utilisation depends upon all of the above [other wrong options] [Discuss in forum] |
| Q7 ⇒ In sodium vapour lamp neon gas assists in developing enough heat to vaporize the sodium [other wrong options] [Discuss in forum] |
| Q8 ⇒ Candela is the unit of which of the following ? Luminous intensity [other wrong options] [Discuss in forum] |
| Q9 ⇒ Which of the following lamps is the 'cheapest for the same wattage ? GLS lanip [other wrong options] [Discuss in forum] |
| Q10 ⇒ For the same lumen output, the running cost of the fluorescent lamp is Âless than that of filament lamp [other wrong options] [Discuss in forum] |
| Q11 ⇒ photometer is used for comparing 'the lights of different colours ? Guilds flicker [other wrong options] [Discuss in forum] |
| Q12 ⇒ ____ is a cold cathode lamp. Neon lamp [other wrong options] [Discuss in forum] |
| Q13 ⇒ The flicker effect of fluorescent lamps is more pronounced at lower frequencies [other wrong options] [Discuss in forum] |
| Q14 ⇒ Glare is reduced by all of the above [other wrong options] [Discuss in forum] |
| Q15 ⇒ In fluorescent tubes ballast resistance is connected in series with the choke when tube operates on D.C. supply [other wrong options] [Discuss in forum] |
| Q16 ⇒ Colour of light depends upon both (a) and (b) [other wrong options] [Discuss in forum] |
| Q17 ⇒ Which of the following is not the standard rating of GLS lamps ? 75W [other wrong options] [Discuss in forum] |
| Q18 ⇒ For the same power output low voltage rated lamps will be more sturdy [other wrong options] [Discuss in forum] |
| Q19 ⇒ In the fluorescent tube circuit the funcÂtion of choke is primarily to Âinitiate the arc and stabilize it [other wrong options] [Discuss in forum] |
| Q20 ⇒ In case of ____ least illumination level is required.  hospital wards [other wrong options] [Discuss in forum] |
| Or |