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DC Generator Question & Answers

November 1, 2021 By Wat Electrical

This article lists 100 DC generator MCQs for engineering students. All the DC generator Questions & Answers given below include a solution and 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 their fundamentals on the DC generator topic which is core in Electrical Engineering.

Generators are separate electrical devices or machines, used to supply electricity once electricity from the nearby grid is not available. These are classified into two types based on their output like AC generators and DC generators.

These generators play a key role by providing backup power to homes, businesses, industries, organizations when there is no power supply. The main function of Generators is to change the energy from mechanical or chemical into electrical.

1). For large DC loads, we connect DC generators in--------

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2). For connecting two DC generators in parallel they should have ---?

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3). Lap windings in DC generators are used for---?

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4). For parallel connected Dc generators, the summation of the current carried by them is equal to---?

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5). For the DC generator, the resistance of ------is critical?

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6). In an idle DC generator, the % of regulation is...?

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7). The Field coils of the DC generator are made up of ----?

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8). The first electrical generator was invented by…?

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9). DC generators are categorized into ….. Types depending on the field excitation methods?


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10). The material used to make the core lamination is?

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11). If the generators are need to run parallel then which of the following type is used?

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12). If the critical resistance of a DC generator is increased then…?

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13). Welding generator includes….winding?

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14). The armature winding’s resistance mainly depends on…?

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15). Which of the following bearings are used to give support to the rotor shaft?

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16). The mechanical losses within DC generators are the main function of?

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17). The flow of current to the external circuit in a DC generator can be given through?

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18). The material used to make a brushless dc machine is?

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19). Which of the following material is used for commutator brushes?

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20). When the armature is….wound then equalizer rings are necessary?

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21). Long shunt compound generator is used in automobiles for…?

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22). A DC generator can be used like a…?

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Please refer to this link to know more about  DC Generators

23). The field resistance is the critical resistance of….?

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24). The working principle of dc generator is…?

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25). The regulation used in DC generators is?

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DC Generator MCQs for Interviews

26). Which generator is used for long transmission line feeding?

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27). When a series generator is self-excited?

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28). How the lamination of a DC generator can be done to…?

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29). In a 4-pole DC machine, the direction of all the poles are…?

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30). In a DC generator, the generated emf is directly proportional to….?

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31). Which of the following generator’s terminal voltage changes when load changes?

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32). In which type of generator, the poorest voltage regulation is there?

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33). The connection of field windings in the separately excited generator is?

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34). The brushes in DC generators are made with…?

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35). The connection of inter pole winding can be done in series with….winding?

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36). A DC shunt generator is an exciter for…?

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37). In electrical machines, which of the following material is used to decrease hysteresis loss…?

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38). When the DC generator’s polarity is reversed, then,?

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39). Lap winding is used in which machines?

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40). How is the magnetic field generated in DC generators?

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41). How many poles are there in small DC machines?

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42). The most commonly used DC machines are…..?

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43). How many parallel paths are available in triplex wave winding…..?

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44). The type of generator used for welding is.?

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45). Stray loss within a DC machine is the sum of …… and …..?

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46). Which of the following part provides DC for a DC generator?

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47). In commutator segments, which of the following material is used?

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48). When dummy coils are used in a DC generator?

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49). Which of the following loss has the highest proportion within DC generators?

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50). Which loss will be changed with the load current in DC machines?

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DC Generator MCQs for Exams

51). What is the function of the fractional pitch in the DC generator?

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52). Why aluminum is not used as a winding within DC machines?

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53). What is the function of frog leg winding in a DC machine?

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54). In a DC machine, the armature MMF signal shape is?

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55). Which of the following is used to get sparkles communication?

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56). When does a series generator excite?

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57). Once the field winding resistance in a DC generator is increased then the o/p voltage will be….?

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58). When the generator runs on no-load then which of the following type generator will have negligible terminal voltage?

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59). The armature MMF in a DC machine is directed through the…axis?

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60). The armature winding in DC machines is located on the rotor for…?

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61). A machine that is used to change the energy from mechanical to electrical is called?

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62). Which generator provides stable voltage for different loads?

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63). The reciprocal of reluctance is known as?

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64). Which of the following brush has less voltage drop?

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65). Which of the following component is used to provide DC for a DC generator?

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66). The brushes within a commutator mainly depend on…?

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67). How the magnetic field can be generated within DC machines?

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68). In commutator segments, the insulating material used is…?

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69). Which of the following material is used to make brushes?

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70). The field coils are made with?

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71). What is the name of the first electrical generator?

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72). The name of the first electromagnetic generator is…?

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73). The electromagnetic generator was invented in which year…?

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74). The function of an electric generator is quite opposite of…?

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75). How many categories are there in electromagnetic generators?

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DC Generator MCQs for Quiz

76). In a DC machine, the external frame is called as?

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77). How many principal components are there in DC machines?

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78). How the poles are connected to the yoke in DC machines?

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79). The field system in DC generators is used to generate?

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80). Practical DC machines include….?

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Please refer to this link to know more about DC Machine

81). Which of the following device is used to convert AC to DC and DC to AC?

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82). How many types of losses are there in the DC machine?

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Please refer to this link to know more about Types of Losses in DC Machine

83). The principle used by the generator to convert the energy is?

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84). In a generator, when the power loss occurs within the armature winding then it is known as?

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85). A heat loss is called as?

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86). Which of the following construction is the main difference between practical and normal generators?

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87). In the series-wound type, which of the following are connected with the armature in series?.

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88). In a shunt-wound generator, the field coils are connected in shunt with…?.

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89). Which of the following occurs when the load changes in a generator?

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90). Which of the following is used for increasing/reducing terminal voltage?

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91). When the generators are connected in parallel then they provide?

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92). The special-purpose type DC generators are called as?

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93). Armature types in DC generator are?

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94). Once the voltage is provided to the main windings then it is known as?

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95). The generator which gets current from an external source?

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96). Which of the following generator uses their o/p voltage to strengthen field coils?

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97). The output changes with load currents directly in….generators?

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98). The distribution of actual flux in dc generators mainly depends on…?

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99). Which of the following material is harder in a commutator?

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100). The voltage build-up in a shunt generator can be restricted by?

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