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