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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?

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2). What makes the surface look bright?

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3). What happens in illumination?

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4). What is Luminous flux/area?

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5). What does the symbol of illumination contain?

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6). What are the features to provide good illumination?

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7). Illumination levels are dependent on _________?


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8). What determines the levels of illumination?

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9). How much should be the illumination level for small objects?

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10). What happens to the illumination level if the distance between the object & observer is small?

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11). What happens to the illumination level if the object is dark in color?

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12). How does object state affect illumination levels?

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13). The continuous observation of an object requires ________ illumination levels?

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14). Glare will be absent in __________?

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15). How many types of glare are in lighting schemes?

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16). Which type of glare is caused due shine in objects?

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17). What happens in Direct Glare?

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18). Reflectors are absent in ________?

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19). What is prevented if the light falling is not direct?

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20). The aperture is adjusted by the eyes of human beings is depends on _______levels?

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21). Colour rendering is avoided in ________?

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22). What gives the 3-D view of the object in illumination?

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23). The shadows must be avoided in _________?

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24). What should be the object's color in the Good Scheme of Illumination?

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25). The contrast changing abruptly must be avoided in ____________?

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Electric Illumination MCQs for Exams

26). E is the letter denotes?

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27). What does the illumination deal with artificial light sources?

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28). What are the radiant energies from a hotter body produce?

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29). What does the waves of light radiating / second referred to as?

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30). How light can be expressed?

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31). φ is the symbol of ___________?

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32). What is the angle formed due to lines converging?

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33). What is Arc length per Radius called?

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34). What is the angle formed by the multiple lines at a certain point?

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35). What is denoted by ‘ω’?

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36). What is Area/radius ^2?

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37). What is Lumen?

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38). Meter Candle is the unit of _________?

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39). What is (CP* ω)/ A?

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40). What do I denote?

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41). What is Luminous Flux/ ω?

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42). What is Luminous Intensity / Area Projected?

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43). Which law gives a relation between surface distance & illumination?

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44). Which law states the surface of illumination is inverse in proportion to the distance square?

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45). Which law states that the received light is dependent on the angle?

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46). How illumination is related to cosine angle?

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47). What is Polar Curve?

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48). What is affected due to the unsymmetrical lamp shape?

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49). In how many types of polar curves are categorized?

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50). When the polar curve is horizontal?

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Electric Illumination MCQs for Students

51). What is MSCP?

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52). What is determined using a polar curve?

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53). What are the methods utilized in the calculation of illumination?

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54). Which method of illumination has the Thumb rule methodology?

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55). Which method is known as Light-flux Method?

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56). What is the Point-point method?

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57). Which method of illumination calculation is complicated?

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58). What produces light due to heating the substance?

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59). What produces the light due to the current flowing through the substance?

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60). Which produces light due to photons absorption?

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61). What type of wave light consists of?

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62). Light color is dependent upon _______?

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63). Where does the light strike on the surface of the testing object?

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64). Any color light can be utilized in ________?

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65). If RGB color sources are mixed. Which light is illuminated?

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66). Which consists of High CRI?

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67). Led is the example of ______?

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68). What is the concept of illumination utilized in Halogen lamps?

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69). Which has a low CRI?

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70). What produces light with photons emitted containing less energy compared to absorbed ones?

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71). What produces light due to bombardment using Ionized radiation?

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72). What are the examples of High-Intensity Discharge Lamps?

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73). What is the downside of Electrodeless lamps?

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74). Which are not suitable for the general purpose of lighting?

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75). Why laser illumination is preferred?

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Electric Illumination MCQs for Interviews

76). Which laser is preferred for the evaluation of the workpiece elongated?

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77). What detects 3 D shape of metal components?

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78). Industrial Image Processing use ______?

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79). What is used in Line Scan Cameras?

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80). What does a halogen lamp consist of?

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81). What is the purpose of Colour Illumination?

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82). How to detect features of objects?

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83). Photosynthetic micro-organisms growth needs ________?

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84). What maintains the lighting?

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85). What are the illumination units?

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86). Glow-in-the-dark signs is due to _______?

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87). What are the advantages of Phosphorescence?

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88). Why do manufacturing plants prefer a Good Scheme of Illumination?

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89). What is provided by the Good Scheme of Illumination?

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90). What must be avoided in Good Illumination Scheme?

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91). What provides lighting economically?

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92). What prevents strain & fatigue occurrence on the eyes?

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93). What is used in treating jaundice in neo-natal?

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94). Which requires lower illumination levels?

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95). How illumination is a part of medical treatment?

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96). Plant growth can be aided by ________?

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97). What is used as a heat source in the incubators?

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98). What is used in the treatment of deficiency of Vitamin D?

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99). Which requires the highest illumination levels?

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100). Which lamps have a short life?

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