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