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