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Isolator Question & Answers

February 16, 2023 By Wat Electrical

This article lists 100 Isolator MCQs for engineering students. All the Isolator 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, or interviews, or professionals who would like to brush up on the fundamentals of Isolator.

A switch that is operated manually and can isolate the sub-station fault section is referred to as an Isolator. It is also known as a Disconnector.  Two distinct parts of the power circuits or the instruments are isolated using Isolators. The separation of parts can be either electrical or physical and sometimes can be both.

When it is no load in the circuit it can be opened using electrical switches called Isolators. These circuits should not be opened when there is a flowing current detected in the circuit. These Isolators are installed at the ends of Circuit breakers such that they can be repaired without risks.

Depending on applications isolators are categorized as Double break, single break & Pantograph. Based on the location of power systems these isolators are classified into three distinct types. They are Bus side, Line side & Transfer bus-side isolators.

There is a major difference between the circuit breaker & isolator. The circuit is detached during Off-load conditions in isolators whereas it is isolated for ON-load conditions in circuit breakers. But both follow the similar detachment principle. Isolators are used in the transmission lines to insulate them from conductors.

1). What is an Isolator?

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2). Where we can find Isolators?

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3). What is used in electrical substations to provide isolation?

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4). Which switch is used to isolate the devices for safety purposes?

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5) Electric arc suppression is absent in ___________?

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6). Breaking capacity is low in __________?

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7). IEC 62271-102 is the standard of ___________?


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8). Lockout-tagout is possible in ____________?

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9). Greater voltage with-standing capability must be in ____________?

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10). How the isolators are operated?

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11). When does an isolator can open the circuit?

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12). What is placed at the circuit breaker ends?

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13). How do the isolators are classified?

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14). Which isolator belongs to the category of system requirements?

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15). What are the various isolators based on the requirement of the system?

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16). In how many types the isolators are classified based on the location of power systems?

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17). Which Isolator has a connection with the Main bus?

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18). Which isolators are present at the feeders?

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19). Which Isolator has a connection with the Transfer bus?

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20). How many stacks of post insulators are present in Double-break isolators?

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21). Isolators are __________?

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22). The non-conductive separations that inhibit the flow of current occur in _______?

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23). What blocks the high common-mode voltages in the signals?

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24). What can block the voltage potential?

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25). What is the necessity of using Electrical isolation?

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Isolator MCQs for Interviews

26). How Galvanic Isolation can be accomplished?

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27). How the isolation can be performed on signals?

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28). What is the example of a Galvanic Isolator?

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29). What is bulkier than the capacitive isolators?

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30). What prevents the circuit from electric shocks?

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31). Galvanic isolators block _______________?

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32). What is allowed to pass through Galvanic isolators?

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33). How many terminals are used for connection & disconnection in single break isolators?

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34). Which isolator has a movable terminal at the center?

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35). No mechanism of locking in ____________?

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36). What is used on the circuit breaker on both sides?

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37). What is connected between the line & feeder?

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38). What is used if the main bus-side isolators are not available?

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39). Which isolators are used in circuit breakers?

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40). What are the isolators based on the voltage of the line?

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41). Which isolator can withstand 11kV voltages?

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42). Medium Voltage isolators can withstand __________?

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43). How many loads of post-insulators are present in Double Break Isolators?

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44). When do Double Break Isolators get disconnected?

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45). In how many parts the arm contacts in Single Break Isolators are divided?

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46). What do the arms of the Single Break Isolator contain?

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47). Which isolator does not require more space?

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48). Which isolator is used in switchgear installation?

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49). Insulation medium is not required by ___________?

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50). Trap charges are easier to eliminate in __________?

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Isolator MCQs for Students

51). The main & moving both contacts are present in ___________?

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52). Which of these devices does not require a Current rating?

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53). When does an isolator provide isolation to supplied power?

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54). What removes the charges trapped?

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55). Relay system is not required in ____________?

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56). During switching overvoltage is not rise in __________?

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57). Which type of switches of isolation are used in substations?

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58). The insulator's ability that minimizes the current flow for high voltages applied is referred to as ___________?

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59). What contains the Earth switch?

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60). Isolators are __________?

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61). How many poles of isolators are available?

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62). Turning ON or OFF the isolators is _________?

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63). Isolator’s function if the current flowing through the device is _______?

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64). What ensures the max. safety while maintaining the circuit?

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65). Overload protection is not possible in ___________?

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66). Which devices cannot break loads?

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67). Which is operated after circuit breakers?

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68). For manual usage what should be the limited voltage for isolators?

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69). What happens to the capacity of breaking in isolators?

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70). ___________ lacks the inbuilt ‘arc suppressing system’?

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71). What requires maintenance frequently?

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72). Industrial sectors mostly use ______?

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73). Why there are low withstanding capacities in isolators?

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74). The poles used in isolators are __________?

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75). Which isolator is used to provide connectivity among the busbars?

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Isolator MCQs for Exams

76). Pantograph isolators are __________?

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77). ____________ have a dead mechanism at the center?

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78). Which isolator was installed that minimize the area of the substation?

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79). What is the medium utilized by Isolator?

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80). What can be disconnected using Isolators?

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81). Insertion loss should be least in ___________ of the microwave?

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82). What allows the constant impedances at the transmitter?

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83). What minimizes the interferences between the incident & reflected wave?

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84). What permits microwave power to transmit in a single direction?

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85). Electrical Isolators provide _______________?

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86). Which isolators are used in Electrical trains?

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87). Isolator must be ______as the circuit breakers in a circuit will be open?

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88). At which conditions do isolators operate?

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89). Electrical substations use ________ switch to disconnect power transformers.

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90). Isolators are used in ___________?

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91). Where we can find Electrical isolators?

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92). Which isolators are abundantly used in the substations?

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93). Isolators are utilized in ____________?

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94). What are the important elements of an Isolator?

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95). What is the downside of Isolators?

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96). The isolator matrix will not be __________?

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97). The power reflecting from the source will be absorbed __________?

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98). Dc signals are blocked by __________?

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99). Which can be operated manually?

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100). What separates the sub-station fault section?

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