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