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