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