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