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