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