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