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