Electric Illumination Quiz Set 1 Posted on June 11, 2020September 8, 2020 by Surendra 0% 2 Created by Surendra Electric Illumination Quiz in English Set 1 All Important Question Answers for Electrician Related Exams 1 / 20 Carbon arc lamps are commonly used in photography. street lighting domestic lighting cinema projectors 2 / 20 Light waves travel with a velocity of 3 x 1015 cm/s 3 x 1018 cm/s. 3 x 1012cm/s 3 x 1010cm/s 3 / 20 The unit of luminous flux is lux. lumen candela steradian 4 / 20 Luminous efficiency of a fluorescent tube is 30 - 40 lumens/watt 15-20 lumens/watt 5- 10 lumens/watt 60 - 65 lumens/watt. 5 / 20 Radiant efficiency of the luminous source depends on temperature of the source all of the above. shape of the source wavelength of light rays 6 / 20 Which of the following will need lowest level of illumination ? Railway platform Auditoriums. Displays Fine engraving 7 / 20 The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux. Above statement is associated with Macbeth's law of illumination Lambert's cosine law. Planck's law Bunsen's law of illumination 8 / 20 Which of the following will need the highest level of illumination ? Proof reading Hospital wards Bed rooms Railway platforms. 9 / 20 Which photometer depends for its operation on Inverse Square Law ? Lummer Brodhun Photometer Trotter Illumination Photometer. Guilds Flicker Photometer Macbeth illuminometer 10 / 20 Which of the following lamp gives nearly monochromatic light ? Sodium vapor lamp Tube light Mercury vapor lamp. GLS lamp 11 / 20 Light is produced in electric discharge lamps by ionization in a gas or vapor magnetic effect of current heating effect of current carbon electrodes. 12 / 20 One lumen per square meter is the same as One candela One lumen meter. One lux One foot candle 13 / 20 Illumination level required for precision work is around 500 lm/m2. 50 lm/m2 100 lm/m2 200 lm/m2 14 / 20 The illumination level in houses is in the range 40-75 lumen/m2 30 - 50 lumen/m2 100-140 lumen/m2. 10-20 lumen/m2 15 / 20 Candela is the unit of None of the above. Luminous flux Wavelength Luminous intensity 16 / 20 Melting temperature of tungsten is 2500°K 2655°K 3655°K. 2000°K 17 / 20 Candela is-the unit for Brightness Luminous intensity Light flux Luminous efficiency. 18 / 20 The unit of solid angle is candela. solid angle radian steradian 19 / 20 The color temperature of day light is around 50 K 600 K 160 K 6000 K. 20 / 20 Lumen/watt is the unit of Brightness Light flux Luminous efficiency. Luminous intensity कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। Your score is LinkedIn Facebook Twitter 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback