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