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 Lumen/watt is the unit of Luminous intensity Luminous efficiency. Light flux Brightness 2 / 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 3 / 20 One lumen per square meter is the same as One candela One lumen meter. One lux One foot candle 4 / 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. Bunsen's law of illumination Macbeth's law of illumination 5 / 20 Carbon arc lamps are commonly used in photography. cinema projectors domestic lighting street lighting 6 / 20 Melting temperature of tungsten is 2000°K 2500°K 3655°K. 2655°K 7 / 20 Candela is the unit of Luminous flux Wavelength None of the above. Luminous intensity 8 / 20 Which of the following will need the highest level of illumination ? Proof reading Hospital wards Bed rooms Railway platforms. 9 / 20 Light waves travel with a velocity of 3 x 1010cm/s 3 x 1012cm/s 3 x 1015 cm/s 3 x 1018 cm/s. 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 photometer depends for its operation on Inverse Square Law ? Macbeth illuminometer Lummer Brodhun Photometer Trotter Illumination Photometer. Guilds Flicker Photometer 12 / 20 Which of the following lamp gives nearly monochromatic light ? Tube light GLS lamp Mercury vapor lamp. Sodium vapor lamp 13 / 20 The color temperature of day light is around 160 K 6000 K. 600 K 50 K 14 / 20 Radiant efficiency of the luminous source depends on shape of the source wavelength of light rays temperature of the source all of the above. 15 / 20 Candela is-the unit for Light flux Brightness Luminous efficiency. Luminous intensity 16 / 20 Illumination level required for precision work is around 500 lm/m2. 200 lm/m2 100 lm/m2 50 lm/m2 17 / 20 The unit of luminous flux is candela steradian lux. lumen 18 / 20 Luminous efficiency of a fluorescent tube is 15-20 lumens/watt 30 - 40 lumens/watt 60 - 65 lumens/watt. 5- 10 lumens/watt 19 / 20 The unit of solid angle is steradian solid angle radian candela. 20 / 20 Which of the following will need lowest level of illumination ? Displays Railway platform Fine engraving Auditoriums. 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
