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Electrical Insulator Question & Answers

February 25, 2023 By Wat Electrical

This article lists 100 Electrical Insulator MCQs for engineering students. All the  Electrical Insulator 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 Electrical Insulators.

Electric currents cannot flow freely in Insulators. Electrons in the insulators are bounded tightly such that unable to move freely. Various materials like conductors & semiconductors conduct the current compared to insulators very easily. Resistivity is the property that can distinguish insulators from various materials.

Compared to conductors or semiconductors insulators offer high resistances. Non-metals are an example of an insulator. Ideal insulators do not exist because small carriers of charge are also present in them. Large voltages applied to insulators make them conductive and this voltage is referred to as Breakdown voltage.

Paper & glass are the materials that offer higher resistance and are good 'electrical insulators'. Electrical equipment makes use of insulators to separate and support the conductors by preventing the current flow through them. The cables & wirings require insulation. It can be done by wrapping the material that insulates.

Insulating supports are attached to the transmission line or electric distribution of power to towers of transmission & utility poles. The suspended wire's weight is supported using insulators such that no current flow is allowed through the tower toward the ground. Electrical Insulation is generally the absence of conduction. The band gap is larger in insulators.

1). Electrons are bounded tightly in _______________?

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2). Insulators have _____?

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3). Non-metals are the examples of ___________?

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4). What becomes conductive once the extremely larger voltages are applied?

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5). What is the voltage applied to make the insulator conduct?

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6). Paper & glass are the examples of __________?

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7). What separates the electric conductors?


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8). What is used in wrapping electric cables?

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9). Why plastic is utilized in the covering of cable wire?

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10). Plastic is an _____________?

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11). What acts as the barrier of flowing heat?

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12). What are the poor electricity conductors?

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13). Why most of the non-metals are insulators?

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14). Pure water will be an __________?

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15). The electrons in the valence shell are held tightly in ____________?

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16). What is Electrical resistance?

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17). When does the insulator resistance is reduced?

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18). What is the resistivity of glass?

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19). Dielectric strength is large in ____________?

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20). Insulators do not exhibit ___________?

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21). Free electrons are absent in __________?

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22). What are the points true for Insulators?

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23). High temperatures are resisted in _________?

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24). The absence of conduction is referred to as _____________?

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25). What possesses higher permeability of air?

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Electrical Insulator MCQs for Interviews

26). What becomes conductors for higher temperatures?

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27). What should be strong enough such that conductor weight can be carried?

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28). What should be free from impurities i.e., unwanted?

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29). Polystyrene is an __________?

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30). What can improve the performance of the process?

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31). What is enacted as a dielectric in a capacitor?

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32). What holds the position of conductors?

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33). Expanding foam is an __________?

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34). What slows down the electrons?

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35). What is required to successfully operate electronic & electrical apparatus?

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36). What is the resistance offered by perfect insulators?

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37). Screwdriver & plier tools have the handles contain ________?

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38). The charges are confined to a particular part in _________?

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39). Which insulator is light in weight?

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40). Styrofoam reduces ___________?

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41). Which insulators perform well in a polluted area?

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42). Installation cost for polymer insulator is __________?

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43). Which insulator is known as a Composite insulator?

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44). Polymer insulators have ________breakage chance?

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45). Which insulator is hydrophobic?

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46). What is the downside of polymer insulators?

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47). What cause mechanical failures in polymer insulator?

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48). How glass insulators are advantageous compared to others?

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49). Why glass insulators do not get heated when exposed to sunlight?

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50). Which insulators are utilized in the system of distribution & transmission?

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Electrical Insulator MCQs for Exams

51). Why impurities detection is easier in glass insulators?

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52). Which insulator does not get affected by aging?

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53). Glass insulators are __________ than the porcelain insulators?

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54). What is porcelain?

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55). Aluminium Silicate can be mixed with ____________?

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56). Which insulator's dielectric properties can be deteriorated due to porosity?

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57). What are the properties of Insulating materials?

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58). What is the main reason for failures occurring in insulators of overhead lines?

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59). What are the advantages of polymer over glass-based insulators?

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60). Tower design & compacting is possible by _________ insulators.

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61). Which insulator contains both sheds of weather & core in it?

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62). What is the foremost and first model of an insulator?

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63). 33 kV systems can run by using __________?

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64). What is known as Overhead insulators?

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65). What sorts out post & pin insulator limitations?

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66). Which insulators can be carried easily?

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67). How much does the disc of suspension insulators carry?

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68). Which insulators are utilized in substations?

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69). Which insulator can protect transformers & switchgear?

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70). Which insulator overcome pin insulator limitations?

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71). Which insulator is preferable in overhead lines of transmission?

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72). Which insulator requires more space among conductors?

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73). Which insulator is utilized in a distribution network with lower voltages?

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74). Which insulator can perform well in frost & snowy areas?

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75). Which insulators are preferable for the wet area?

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Electrical Insulator MCQs for Students

76). Which insulators are used if the chances of breakdown are more due to human factors?

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77). How many materials of insulation are present in Composite insulators?

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78). Which insulators are an alternative to glass & ceramic insulators?

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79). What are the advantages of Composite insulators?

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80). Overhead of power line have ________?

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81). Large generators & motors are insulated by ________?

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82). What is the material used for insulating in ICs?

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83). Electrical Corona is prevented by ___________?

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84). Why do the wires in the system are placed apart?

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85). Insulator oil is used in ________?

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86). The oxidized silicon is _____?

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87). Mostly insulated cables & wire products consist of ___________?

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88). What does PCBs are made of?

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89). Where do the insulators are used?

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90). Specific capacity of heat is ____________ in insulators?

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91). Diamond is the example of __________?

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92). Ceramic is an _________?

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93). What are the effective insulators?

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94). What is Aerogel?

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95). Thermal conductivity is _________ in insulators.

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96). Why ceramics are not conductors?

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97). Where do the ceramic insulators are found?

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98). What controls the pollutants emitted?

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99). Why do insulators reduce energy costs?

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100). What can prevent high voltages from passing in a circuit?

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