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 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 Lambert's cosine law. Planck's law Macbeth's law of illumination 2 / 20 The color temperature of day light is around 160 K 600 K 50 K 6000 K. 3 / 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 4 / 20 Candela is the unit of Luminous flux None of the above. Wavelength Luminous intensity 5 / 20 Which of the following will need lowest level of illumination ? Auditoriums. Displays Fine engraving Railway platform 6 / 20 Carbon arc lamps are commonly used in cinema projectors photography. domestic lighting street lighting 7 / 20 Illumination level required for precision work is around 200 lm/m2 500 lm/m2. 100 lm/m2 50 lm/m2 8 / 20 Which photometer depends for its operation on Inverse Square Law ? Lummer Brodhun Photometer Trotter Illumination Photometer. Guilds Flicker Photometer Macbeth illuminometer 9 / 20 The unit of luminous flux is candela lumen steradian lux. 10 / 20 Radiant efficiency of the luminous source depends on all of the above. wavelength of light rays shape of the source temperature of the source 11 / 20 Luminous efficiency of a fluorescent tube is 5- 10 lumens/watt 60 - 65 lumens/watt. 15-20 lumens/watt 30 - 40 lumens/watt 12 / 20 One lumen per square meter is the same as One lumen meter. One candela One lux One foot candle 13 / 20 The illumination level in houses is in the range 30 - 50 lumen/m2 10-20 lumen/m2 100-140 lumen/m2. 40-75 lumen/m2 14 / 20 Which of the following lamp gives nearly monochromatic light ? Tube light Sodium vapor lamp Mercury vapor lamp. GLS lamp 15 / 20 The unit of solid angle is steradian candela. solid angle radian 16 / 20 Light waves travel with a velocity of 3 x 1010cm/s 3 x 1015 cm/s 3 x 1018 cm/s. 3 x 1012cm/s 17 / 20 Candela is-the unit for Light flux Luminous efficiency. Brightness Luminous intensity 18 / 20 Which of the following will need the highest level of illumination ? Hospital wards Proof reading Railway platforms. Bed rooms 19 / 20 Melting temperature of tungsten is 3655°K. 2500°K 2655°K 2000°K 20 / 20 Lumen/watt is the unit of Light flux Brightness Luminous intensity Luminous efficiency. 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
