Electric Illumination Question & Answers March 1, 2023 By Wat Electrical This article lists 100 Electric Illumination MCQs for engineering students. All the Electric Illumination Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Electric Illumination. Artificial lighting is all about the components in electrical circuitry utilized for light production. This process of producing light is referred to as Illumination. Before the era of lighting began candles, fire, oil lamps & gas lights is utilized for lighting purposes. Electric illumination has begun in the 20th century. Incandescent bulbs of light were commercialized by the efforts of Thomas Edison & Joseph Swan. These lights are also replaced by arc lamps in the 20th century. Incandescent lamps produce light by heating filaments due to electric currents., A gas discharge lamp produces light via an electric arc using gas. Lights provide illumination through sub-atomic motions, electrical energies, or heat. For example, incandescence produces light due to the heating of a substance, Electroluminescence produces light due to the current passing through the substance, Light produced due to photon absorption is photoluminescence, and so on. The units for illumination are Lux. One Lux is equivalent to one Lumen / sq. m. Both light & illuminance are different from each other. Where the cause is light & the result obtained due to the cause is illumination. The surface can look less or brighter due to illumination. The total light put out by the source is calculated by Illuminance. 1). When the light falls on the surface and becomes visible. What is this phenomenon called? Lamination Illumination Luminance Brightness Hint 2). What makes the surface look bright? Lamination Illumination Luminance Brightness Hint 3). What happens in illumination? Electrical Energy Converted to Mechanical Energy Electrical Energy Converted to Radiation Energy Electrical Energy Converted to Rotation Energy Electrical Energy Converted to Chemical Energy Hint 4). What is Luminous flux/area? Lamination Illumination Luminance Brightness Hint 5). What does the symbol of illumination contain? Cross Inside a Circle Cross Outside a Circle Semi-circular Dent in a Circle Semi-circular Dent Outside a Circle Hint 6). What are the features to provide good illumination? Adequate Illumination Avoid Hard Shadows Suitable Colour Light Provided All Mentioned Above Hint 7). Illumination levels are dependent on _________? Object’s Size Distance Among Light Source & Object Object’s Colour All Mentioned Above Hint 8). What determines the levels of illumination? Light's Magnitude Falling on Objects Light Reflected by Objects a & b None Hint 9). How much should be the illumination level for small objects? Lower Greater Minimum Zero Hint 10). What happens to the illumination level if the distance between the object & observer is small? Greater Infinite Higher Lower Hint 11). What happens to the illumination level if the object is dark in color? Lower Greater Minimum Zero Hint 12). How does object state affect illumination levels? Stationary Objects Require Less Illumination Stationary Objects Require More Illumination Moving Objects Requires Less Illumination Moving Object & Illumination Levels are Independent Hint 13). The continuous observation of an object requires ________ illumination levels? Lower Greater Minimum Zero Hint 14). Glare will be absent in __________? Lamination Illumination Luminance Brightness Hint 15). How many types of glare are in lighting schemes? Four Three Two One Hint 16). Which type of glare is caused due shine in objects? Direct Glare Uniform Glare Indirect Glare Inverse Glare Hint 17). What happens in Direct Glare? Lamps Mounted Too Low Lamps Mounted Too High Incident Light Reflected Reflectors are Present Hint 18). Reflectors are absent in ________? Direct Glare Uniform Glare Indirect Glare Inverse Glare Hint 19). What is prevented if the light falling is not direct? Direct Glare Uniform Glare Indirect Glare Inverse Glare Hint 20). The aperture is adjusted by the eyes of human beings is depends on _______levels? Lamination Illumination Luminance Brightness Hint 21). Colour rendering is avoided in ________? Lamination Illumination Luminance Brightness Hint 22). What gives the 3-D view of the object in illumination? Dark Shadow Long Shadow Hard Shadow Dull Shadow Hint 23). The shadows must be avoided in _________? Lamination Illumination Luminance Brightness Hint 24). What should be the object's color in the Good Scheme of Illumination? Artificial Natural Must be Different from Original Changed Based on Light Incident Hint 25). The contrast changing abruptly must be avoided in ____________? Lamination Illumination Luminance Brightness Hint Electric Illumination MCQs for Exams 26). E is the letter denotes? Lamination Illumination Luminance Brightness Hint 27). What does the illumination deal with artificial light sources? Selection Installation Design All Mentioned Above Hint 28). What are the radiant energies from a hotter body produce? Lamination Flux Light Brightness Hint 29). What does the waves of light radiating / second referred to as? Luminous Luminous Flux Phase Angle Plane Angle Hint 30). How light can be expressed? Lumens Lumen-Hours Weber Tesla Hint 31). φ is the symbol of ___________? Luminous Luminous Flux Phase Angle Plane Angle Hint 32). What is the angle formed due to lines converging? Luminous Luminous Flux Phase Angle Plane Angle Hint 33). What is Arc length per Radius called? Luminous Luminous Flux Phase Angle Plane Angle Hint 34). What is the angle formed by the multiple lines at a certain point? Luminous Luminous Flux Solid Angle Plane Angle Hint 35). What is denoted by ‘ω’? Luminous Luminous Flux Solid Angle Plane Angle Hint 36). What is Area/radius ^2? Luminous Luminous Flux Solid Angle Plane Angle Hint 37). What is Lumen? Product of Candle Power of Source & Solid Angle Product of Candle Power of Source & Plane Angle Addition of Candle Power of Source & Solid Angle Subtraction of Candle Power of Source & Solid Angle Hint 38). Meter Candle is the unit of _________? Lamination Illumination Luminance Brightness Hint 39). What is (CP* ω)/ A? Lamination Illumination Luminance Brightness Hint 40). What do I denote? Luminous Luminous Intensity Solid Angle Plane Angle Hint 41). What is Luminous Flux/ ω? Luminous Luminous Intensity Solid Angle Plane Angle Hint 42). What is Luminous Intensity / Area Projected? Lamination Illumination Luminance Brightness Hint 43). Which law gives a relation between surface distance & illumination? Faradays Law Ohms Law Kirchoff’s Law Inverse Square Law Hint 44). Which law states the surface of illumination is inverse in proportion to the distance square? Faradays Law Ohms Law Kirchoff’s Law Inverse Square Law Hint 45). Which law states that the received light is dependent on the angle? Faradays Law Lambert’s Cosine Law Kirchoff’s Law Inverse Square Law Hint 46). How illumination is related to cosine angle? Equal To Inversely Proportional Directly Proportional None Hint 47). What is Polar Curve? Plot Drawn among Angular Position & Candle Power Plot Drawn for Candle Power Plot Drawn for Solid Angle Plot Drawn for Plane Angle & Candle Power Hint 48). What is affected due to the unsymmetrical lamp shape? Luminous Luminous Intensity Solid Angle Plane Angle Hint 49). In how many types of polar curves are categorized? Four Three Two One Hint 50). When the polar curve is horizontal? Candle Power Measured in Horizontal Plane Candle Power Measured in Vertical Plane Candle Power Measured at Origin a & b Hint Electric Illumination MCQs for Students 51). What is MSCP? Mean Spherical Candle Power Median Spherical Commercial Product Mean Spherical Company Project Mean Spherical Candle Position Hint 52). What is determined using a polar curve? Actual Surface Illumination MHCP MSCP All Mentioned Above Hint 53). What are the methods utilized in the calculation of illumination? Point-Point Lumen Watt /Square Meters All Mentioned Above Hint 54). Which method of illumination has the Thumb rule methodology? Point-Point Lumen Watt /Square Meters All Mentioned Above Hint 55). Which method is known as Light-flux Method? Point-Point Lumen Watt /Square Meters All Mentioned Above Hint 56). What is the Point-point method? Faradays Law Lambert’s Cosine Law Kirchoff’s Law Inverse Square Law Hint 57). Which method of illumination calculation is complicated? Point-Point Lumen Watt /Square Meters All Mentioned Above Hint 58). What produces light due to heating the substance? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint 59). What produces the light due to the current flowing through the substance? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint 60). Which produces light due to photons absorption? Electroluminescence Cathodoluminescence Incandescence Photoluminescence Hint 61). What type of wave light consists of? Electrical Magnetic Chemical Electromagnetic Hint 62). Light color is dependent upon _______? Temperature Wavelength Frequency b & c Hint 63). Where does the light strike on the surface of the testing object? Solid Angle Reflection Angle Incident Angle Plane Angle Hint 64). Any color light can be utilized in ________? Lamination Illumination Luminance Brightness Hint 65). If RGB color sources are mixed. Which light is illuminated? Yellow Magenta White Red Hint 66). Which consists of High CRI? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint 67). Led is the example of ______? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint 68). What is the concept of illumination utilized in Halogen lamps? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint 69). Which has a low CRI? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint 70). What produces light with photons emitted containing less energy compared to absorbed ones? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint 71). What produces light due to bombardment using Ionized radiation? Electroluminescence Radioluminescence Incandescence Fluorescence Hint 72). What are the examples of High-Intensity Discharge Lamps? Mercury Vapour Lamps Ceramic Metal Halide Halogen Lamp a & b Hint 73). What is the downside of Electrodeless lamps? RF Interference Created Larger Size Mercury in Lamp All Mentioned Above Hint 74). Which are not suitable for the general purpose of lighting? Electroluminescence Radioluminescence Incandescence Fluorescence Hint 75). Why laser illumination is preferred? Precise Imaging Longer Distance Shorter Distance a & b Hint Electric Illumination MCQs for Interviews 76). Which laser is preferred for the evaluation of the workpiece elongated? Simple Laser Line LASER Multi-lines LASER Grid All Mentioned Above Hint 77). What detects 3 D shape of metal components? Simple Laser Line LASER Multi-lines LASER Grid All Mentioned Above Hint 78). Industrial Image Processing use ______? Incandescent Lamp Halogen Lamp Sodium Vapor Lamp Fluorescent Lamp Hint 79). What is used in Line Scan Cameras? Incandescent Lamp Halogen Lamp Sodium Vapor Lamp Fluorescent Lamp Hint 80). What does a halogen lamp consist of? A Point Light Source Reflector No Reflectors a & b Hint 81). What is the purpose of Colour Illumination? Darkening of Object Colour Brightening of Object Colour Remains Same a & b Hint 82). How to detect features of objects? Lamination Illumination Luminance Brightness Hint 83). Photosynthetic micro-organisms growth needs ________? Lamination Illumination Luminance Brightness Hint 84). What maintains the lighting? Lamination Illumination Luminance Brightness Hint 85). What are the illumination units? Lux Meter Candle Foot Candle All Mentioned Above Hint 86). Glow-in-the-dark signs is due to _______? Electroluminescence Cathodoluminescence Incandescence Phosphorescence Hint 87). What are the advantages of Phosphorescence? Extreme Long-Life Zero Power Consumption Easy to Install All Mentioned Above Hint 88). Why do manufacturing plants prefer a Good Scheme of Illumination? Reduce Accidents Reduce the Product Rejects Increase Productivity All Mentioned Above Hint 89). What is provided by the Good Scheme of Illumination? Correct Colour of Light Increased Productivity Provides Security All Mentioned Above Hint 90). What must be avoided in Good Illumination Scheme? Excessive Brightness Excess Contrast Fatigue on Eyes All Mentioned Above Hint 91). What provides lighting economically? Lamination Illumination Luminance Brightness Hint 92). What prevents strain & fatigue occurrence on the eyes? Lamination Illumination Luminance Brightness Hint 93). What is used in treating jaundice in neo-natal? Lantern Electric Lamp Fire All Mentioned Above Hint 94). Which requires lower illumination levels? Railway Platforms Fine Engravings Displays Auditoriums Hint 95). How illumination is a part of medical treatment? Acne Dermatitis Skin Cancer All Mentioned Above Hint 96). Plant growth can be aided by ________? Lantern Electric Lamp Fire All Mentioned Above Hint 97). What is used as a heat source in the incubators? Lantern Electric Lamp Fire All Mentioned Above Hint 98). What is used in the treatment of deficiency of Vitamin D? Lantern Electric Lamp Fire All Mentioned Above Hint 99). Which requires the highest illumination levels? Hospital Wards Bedrooms Proof Reading Platform Hint 100). Which lamps have a short life? Electroluminescence Cathodoluminescence Incandescence Fluorescence Hint Time's up
