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