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