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 _______________? Insulator Conductor Semiconductor Dielectric Hint 2). Insulators have _____? Low Resistance High Resistance Low Conductivity b & c Hint 3). Non-metals are the examples of ___________? Insulator Conductor Semiconductor Dielectric Hint 4). What becomes conductive once the extremely larger voltages are applied? Insulator Conductor Semiconductor Dielectric Hint 5). What is the voltage applied to make the insulator conduct? High Voltage Low Voltage Zero Voltage Break Down Voltage Hint 6). Paper & glass are the examples of __________? Insulator Conductor Semiconductor Dielectric Hint 7). What separates the electric conductors? Insulator Conductor Semiconductor Dielectric Hint 8). What is used in wrapping electric cables? Insulator Conductor Semiconductor Dielectric Hint 9). Why plastic is utilized in the covering of cable wire? Insulator Conductor Semiconductor Dielectric Hint 10). Plastic is an _____________? Insulator Conductor Semiconductor Dielectric Hint 11). What acts as the barrier of flowing heat? Insulator Conductor Semiconductor Dielectric Hint 12). What are the poor electricity conductors? Insulator Conductor Semiconductor Dielectric Hint 13). Why most of the non-metals are insulators? More Free Electrons Availability No Free Electrons Movable Free Electrons a &c Hint 14). Pure water will be an __________? Insulator Conductor Semiconductor Dielectric Hint 15). The electrons in the valence shell are held tightly in ____________? Insulator Conductor Semiconductor Dielectric Hint 16). What is Electrical resistance? Material that Allows Current Material that Restricts Current Material that Allows or Restrict Current Material that Allows the Charges to Flow Hint 17). When does the insulator resistance is reduced? Moisture Presence Temperature Decreased Increased Temperature a & c Hint 18). What is the resistivity of glass? 10^12 10^-12 10^13 10^-13 Hint 19). Dielectric strength is large in ____________? Insulator Conductor Semiconductor Dielectric Hint 20). Insulators do not exhibit ___________? Electric Properties Magnetic Properties a & b None Hint 21). Free electrons are absent in __________? Insulator Conductor Semiconductor Dielectric Hint 22). What are the points true for Insulators? More Free Electrons High Conductivity Low Conductivity Low Electrical Resistance Hint 23). High temperatures are resisted in _________? Insulator Conductor Semiconductor Dielectric Hint 24). The absence of conduction is referred to as _____________? Resonance Perseverance Insulation Capacitance Hint 25). What possesses higher permeability of air? Insulator Conductor Semiconductor Dielectric Hint Electrical Insulator MCQs for Interviews 26). What becomes conductors for higher temperatures? Insulators Metals Semiconductor Dielectric Hint 27). What should be strong enough such that conductor weight can be carried? Insulating Material Conducting Material Semi-conducting Material All Mentioned Above Hint 28). What should be free from impurities i.e., unwanted? Insulating Material Conducting Material Semi-conducting Material All Mentioned Above Hint 29). Polystyrene is an __________? Insulators Metals Semiconductor Dielectric Hint 30). What can improve the performance of the process? Insulators Metals Semiconductor Dielectric Hint 31). What is enacted as a dielectric in a capacitor? Insulators Metals Semiconductor Dielectric Hint 32). What holds the position of conductors? Insulators Metals Semiconductor Dielectric Hint 33). Expanding foam is an __________? Insulators Metals Semiconductor Dielectric Hint 34). What slows down the electrons? Copper Gold Graphite Rubber Hint 35). What is required to successfully operate electronic & electrical apparatus? Insulators Metals Semiconductor Dielectric Hint 36). What is the resistance offered by perfect insulators? Zero High Low Infinite Hint 37). Screwdriver & plier tools have the handles contain ________? Insulators Metals Semiconductor Dielectric Hint 38). The charges are confined to a particular part in _________? Insulators Metals Semiconductor Dielectric Hint 39). Which insulator is light in weight? Porcelain Mica Glass Polymer Hint 40). Styrofoam reduces ___________? Convection Conduction Temperature a & b Hint 41). Which insulators perform well in a polluted area? Porcelain Mica Glass Polymer Hint 42). Installation cost for polymer insulator is __________? High Low More Zero Hint 43). Which insulator is known as a Composite insulator? Porcelain Mica Glass Polymer Hint 44). Polymer insulators have ________breakage chance? Minimum Maximum High None Hint 45). Which insulator is hydrophobic? Porcelain Mica Glass Polymer Hint 46). What is the downside of polymer insulators? Moisture Can Enter the Core Over Crimping leads to Cracks Lighter in Weight a & b Hint 47). What cause mechanical failures in polymer insulator? Moisture Can Enter the Core Over Crimping leads to Cracks Lighter in Weight a & b Hint 48). How glass insulators are advantageous compared to others? High Dielectric Strength High Resistivity High Tensile Strength All Mentioned Above Hint 49). Why glass insulators do not get heated when exposed to sunlight? Opaque Nature Transparent Nature Flexible Nature Rigid Nature Hint 50). Which insulators are utilized in the system of distribution & transmission? Porcelain Mica Glass Polymer Hint Electrical Insulator MCQs for Exams 51). Why impurities detection is easier in glass insulators? Opaque Nature Transparent Nature Flexible Nature Rigid Nature Hint 52). Which insulator does not get affected by aging? Porcelain Mica Glass Polymer Hint 53). Glass insulators are __________ than the porcelain insulators? Costly Cheap Higher in Cost None Hint 54). What is porcelain? Silicon Oxide Silicon Nitride Aluminium Silicate Aluminium Nitride Hint 55). Aluminium Silicate can be mixed with ____________? Plastic Kaolin Feldspar Quartz All Mentioned Above Hint 56). Which insulator's dielectric properties can be deteriorated due to porosity? Porcelain Mica Silicon Silicon Nitride Hint 57). What are the properties of Insulating materials? High Dielectric Strength Not be Porous Free from Unwanted Impurities All Mentioned Above Hint 58). What is the main reason for failures occurring in insulators of overhead lines? Resistance Temperature Flashover All Mentioned Above Hint 59). What are the advantages of polymer over glass-based insulators? Greater Design Flexibility Heavy Metal Tungsten Free All Mentioned Above Hint 60). Tower design & compacting is possible by _________ insulators. Porcelain Mica Polymer Silicon Nitride Hint 61). Which insulator contains both sheds of weather & core in it? Porcelain Mica Polymer Silicon Nitride Hint 62). What is the foremost and first model of an insulator? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 63). 33 kV systems can run by using __________? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 64). What is known as Overhead insulators? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 65). What sorts out post & pin insulator limitations? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 66). Which insulators can be carried easily? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 67). How much does the disc of suspension insulators carry? 45kV 33kV-45kV 11-15kV 0-5kV Hint 68). Which insulators are utilized in substations? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 69). Which insulator can protect transformers & switchgear? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 70). Which insulator overcome pin insulator limitations? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 71). Which insulator is preferable in overhead lines of transmission? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 72). Which insulator requires more space among conductors? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 73). Which insulator is utilized in a distribution network with lower voltages? Pin Insulator Post Insulator Shackle Insulator Suspension Insulator Hint 74). Which insulator can perform well in frost & snowy areas? Porcelain Glass Polymer Silicon Nitride Hint 75). Which insulators are preferable for the wet area? Porcelain Glass Mica Silicone Hint Electrical Insulator MCQs for Students 76). Which insulators are used if the chances of breakdown are more due to human factors? Porcelain Glass Polymer Silicon Nitride Hint 77). How many materials of insulation are present in Composite insulators? Four Three Two One Hint 78). Which insulators are an alternative to glass & ceramic insulators? Porcelain Mica Polymer Silicon Nitride Hint 79). What are the advantages of Composite insulators? Self-cleaning Performance Less Time to Repair Less Power Interruption All Mentioned Above Hint 80). Overhead of power line have ________? Porcelain Mica Silicon Silicon Nitride Hint 81). Large generators & motors are insulated by ________? Porcelain Mica Silicon Silicon Nitride Hint 82). What is the material used for insulating in ICs? Porcelain Mica Silicon Silicon Nitride Hint 83). Electrical Corona is prevented by ___________? Resonance Perseverance Insulation Capacitance Hint 84). Why do the wires in the system are placed apart? Resonance Perseverance Insulation Capacitance Hint 85). Insulator oil is used in ________? Diodes Transformers Capacitors b & c Hint 86). The oxidized silicon is _____? Insulator Conductor Semiconductor Dielectric Hint 87). Mostly insulated cables & wire products consist of ___________? Maximum Voltage Ratings Maximum Conductor Temperature Minimum Voltage Rating a & b Hint 88). What does PCBs are made of? Epoxy Plastic Fibre Glass a & b None Hint 89). Where do the insulators are used? Circuit Boards Electric Wires Coating Cables Coating All Mentioned Above Hint 90). Specific capacity of heat is ____________ in insulators? High Less Low Zero Hint 91). Diamond is the example of __________? Insulator Conductor Semiconductor Dielectric Hint 92). Ceramic is an _________? Insulator Conductor Semiconductor Dielectric Hint 93). What are the effective insulators? Rubber Pure Water Glass All Mentioned Above Hint 94). What is Aerogel? Insulator Conductor Semiconductor Dielectric Hint 95). Thermal conductivity is _________ in insulators. High Less More Severe Hint 96). Why ceramics are not conductors? Metallic Elements are Present Non-metallic Elements are Present a & b More Free Electrons Hint 97). Where do the ceramic insulators are found? Power Lines Coaxial Cables Circuit Boards All Mentioned Above Hint 98). What controls the pollutants emitted? Insulator Conductor Semiconductor Dielectric Hint 99). Why do insulators reduce energy costs? Heat Loss is Reduced Heat Loss is Increased Bad Conductors a & c Hint 100). What can prevent high voltages from passing in a circuit? Insulators Conductors Semiconductors Dielectric Hint Time's up
