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