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