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