By Surendra | June 11, 2020 0 Comment 0% 2 Created by Surendra Electric Illumination Quiz in English Set 1 All Important Question Answers for Electrician Related Exams 1 / 20 Which photometer depends for its operation on Inverse Square Law ? Guilds Flicker Photometer Trotter Illumination Photometer. Lummer Brodhun Photometer Macbeth illuminometer 2 / 20 Radiant efficiency of the luminous source depends on all of the above. wavelength of light rays temperature of the source shape of the source 3 / 20 The illumination level in houses is in the range 40-75 lumen/m2 10-20 lumen/m2 30 - 50 lumen/m2 100-140 lumen/m2. 4 / 20 Candela is the unit of None of the above. Luminous intensity Luminous flux Wavelength 5 / 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 Lambert's cosine law. Planck's law Bunsen's law of illumination 6 / 20 Illumination level required for precision work is around 50 lm/m2 100 lm/m2 200 lm/m2 500 lm/m2. 7 / 20 Light is produced in electric discharge lamps by ionization in a gas or vapor heating effect of current magnetic effect of current carbon electrodes. 8 / 20 The unit of solid angle is candela. solid angle radian steradian 9 / 20 Melting temperature of tungsten is 2500°K 2655°K 2000°K 3655°K. 10 / 20 Which of the following lamp gives nearly monochromatic light ? Tube light Mercury vapor lamp. GLS lamp Sodium vapor lamp 11 / 20 The unit of luminous flux is candela lumen steradian lux. 12 / 20 Which of the following will need the highest level of illumination ? Railway platforms. Proof reading Hospital wards Bed rooms 13 / 20 Lumen/watt is the unit of Luminous intensity Brightness Light flux Luminous efficiency. 14 / 20 Carbon arc lamps are commonly used in photography. street lighting domestic lighting cinema projectors 15 / 20 Luminous efficiency of a fluorescent tube is 15-20 lumens/watt 5- 10 lumens/watt 60 - 65 lumens/watt. 30 - 40 lumens/watt 16 / 20 Which of the following will need lowest level of illumination ? Fine engraving Auditoriums. Displays Railway platform 17 / 20 Light waves travel with a velocity of 3 x 1010cm/s 3 x 1015 cm/s 3 x 1012cm/s 3 x 1018 cm/s. 18 / 20 One lumen per square meter is the same as One foot candle One candela One lux One lumen meter. 19 / 20 Candela is-the unit for Luminous intensity Light flux Luminous efficiency. Brightness 20 / 20 The color temperature of day light is around 160 K 50 K 6000 K. 600 K कृपया सही सूचना भरें ताकि सर्टिफिकेट ईमेल पर भेजा जा सकें। Your score is LinkedIn Facebook Twitter 0% Restart quiz आपको यह क्विज अच्छी लगी तो 5 स्टार रेटिंग जरुर दें । Send feedback
