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Switch Gear and Protection Question & Answers

February 9, 2023 By Wat Electrical

This article lists 100 Switch Gear and Protection MCQs for engineering students. All the Switch Gear and Protection 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 Switch Gear and Protection.

The switch gear is used for switching, isolation, protection, and control in a power system. The type test, maintenance schedule, acceptance, and commissioning test are the type of tests to be performed on protective gears.

In a power system, the surge voltage is caused due to external and internal over-voltage conditions. The measuring relay, fault clearing time, auxiliary relay, relay time, and relay burden are some basic terminologies used in the protection system.

The essential features of switchgear are; Complete reliability, absolutely certain discrimination, quick operation, provision for manual control, and instruments . The current transformer, potential transformer, and oil switches come under high voltage switchgear, and air break type switches, isolators come under low voltage switchgear.

The switchgear is mainly used in transformer stations, industrial plant factories, distribution substations, paper mills, and so on. The safety of electrical equipment and the safety of human personnel are the operating conditions protection under abnormal.

1). Which one of the following comes under low voltage switchgears?

Hint
Read more about Overload relays
2). What is the standard form of CLR?

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3). Which one of the following comes under potential transformer?

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4). What is the standard form of ACB?

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5). What are the advantages of oil circuit breaker?

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6). The low voltage range of switch gear is up to _______________?

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7). Which one of the following performs both detection and interruption functions?


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8). Which one of the following requires replacement after every operation?

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9). ________________ are the applications of low voltage switch gear?

Hint
Read more about Capacitors
10). What is the standard form of BOCB?

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Read more about Switch Gear components.
11). Which one of the following arresters can be done outside of the panel board?

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12). What is the standard form of TVSS?

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13). What are the essential features of switch gear?

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Read more about Switchgear 
14). Which one of the following comes under switching devices?

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15). What are the disadvantages of oil circuit breaker?

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16). What is the standard form of MCCB?

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17). Which one of the following used as an ON/OFF switch?

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18). What is the standard form of IDMT?

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19). The high voltage range of switch gear is up to _______________?

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20). What is the standard form of MOCB?

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21). Which one of the following is an example of principal switchgear?

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Read more about Fuse & Types
22). What is the standard form of MDB?

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Read more about Isolator

23). Which one of the following comes under symmetric fault?

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24). What are the effects of electrical faults?

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25). Which one of the following comes under high voltage switchgears?

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Switchgear and Protection MCQ for Quiz

26). What is the standard form of MCB?

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27). In which one of the following the breaking capacity is very large?

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28). Which one of the following comes under control and sensing devices?

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29). What are the causes of an electrical faults?

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30). __________________ are the components of digital relay?

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31). What is the standard form of RCCB?

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32). Which one of the following comes under unsymmetric fault?

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33). Which one of the following is an on-load device?

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34). Which one of the following has better capabilities?

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35). What is the standard form of HRC?

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36). Which one of the following requires tripping circuit?

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37). In which one of the following, the periodic maintenance is very much required?

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38). What is the standard form of SAW?

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39). _____________ are the qualities of protective relay?

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40). What is the standard form of VCB?

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41). In which one of the following no auxiliary contact is required?

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42). Which one of the following comes under decision making devices?

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43). What is the standard form of SDB?

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44). Which one of the following has arcing contact and main contact?

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45). What is the standard form of SF6CB?

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46). Which one of the following operating times is very small?

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47). Which one of the following is an example of auxiliary switchgear?

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48). Which one of the following occupies more space?

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49). What is the standard form of GMAW?

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50). What is the standard form of ABCB?

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Switchgear and Protection MCQ for Interviews

51). The _____________ relay is based on actuating parameter?

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52). The ________________ relay is based on operation of mechanism?

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53). What is the standard form of FACTS?

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54). What is the standard form of SVC?

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55). Which one of the following is a type of distance relay?

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56). What is the standard form of LBS?

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57). In which one of the following operating times is from 0.1 to 0.2 sec?

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58). What is the standard form of ATS?

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59). What is the standard form of STATCOM?

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60). Which one of the following is a type of electromagnetic relay?

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61). Which one of the following doesn’t give any indication?

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62). What is the standard form of ELCB?

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63). Which one of the following is a best modelled by magnetic breakers?

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64). What is the standard form of SMAW?

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65). Which one of the following circuit breakers used for medium capacities?

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66). Which one of the following is a safety isolation device?

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67). In which one of the following relays the multifunction's are possible?

Hint
Read more about Distance Relay
68). In which one of the following relays, the blocking feature is not available?

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69). What is the standard form of FCAW?

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70). In which one of the following circuit breakers, the reliability is less?

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71). The extra high voltage range of switch gear is up to _______________?

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72). What is the standard form of MPCB?

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73). Which one of the following is a normal circuit protector?

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74). What is the standard form of ECM?

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75). In which one of the following circuit breakers the endurance is below average?

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Switchgear and Protection MCQ for Exams

76). What is the standard form of EBM?

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77). The heat input is high per unit length in ____________ type of welding?

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78). The welding speed is low in _______________ type of welding?

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79). What is the standard form of GTAW?

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80). Which one of the following circuit breakers sizes is quite large?

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81). What is the standard form of HBC?

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82). Which one of the following has moving blades/alarm and main contact?

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83). The arc quenching techniques provided in ________________?

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84). Which one of the following operated automatically or manually?

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85). What is the standard form of HVCB?

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86). Which one of the following is a best modelled by thermal breakers?

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87). The flags, targets are the visual indications in ______________ relays?

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88). In which one of the following relays the self-supervision feature is available?

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89). The speed of operation is low in ________________ relay?

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90). What is the standard form of LVSD?

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91). The range of settings is wide in _________________ relay?

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92). In which one of the following relays the communication feature is not available?

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93). The consistency of calibration is deteriorate with time in ________________ relay?

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94). Which one of the following relays is not adaptable?

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95). What is the standard form of HVS?

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96). The medium voltage range of switch gear is up to _______________?

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97). The LEDs, LCD are the visual indications in ______________ relays?

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98). What is the standard form of EDM?

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99). Which one of the following found in an electrical distribution and generation stations such as yards?

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100). What is the standard form of HVF?

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For more MCQs refer to
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