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Synchronous Generator Question & Answers

February 4, 2023 By Wat Electrical

This article lists 100 Synchronous Generator MCQs for engineering students. All the Synchronous Generator 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 Synchronous Generator.

The alternator or synchronous generator's basic parts are the rotor which is DC excited winding and the stator three-phase winding. The salient pole and cylindrical or round rotor are two types of synchronous machines.

In an alternator or synchronous generator various losses occur such as armature copper loss, field copper loss, brush contact loss, hysteresis and eddy current loss, friction, and windage loss. Alternators have brushes and slip rings and they also use a rotating coil.

The failure of the prime mover, failure of the exciter, overloading, unbalanced loading, over-voltage, and over-speed are the abnormalities of an alternator or synchronous generator. The different methods to start synchronous motors are by using the pony motors, damper winding, a slip ring induction motor, and using a small DC machine coupled to it.

The synchronizing can be done by using synchroscope and dark lamp methods. The reasons for the parallel operation of synchronous generators are handling larger loads, increased efficiency, increased system reliability, and maintenance that can be done without power dissipation. 

1). Which one of the following methods is used to find voltage regulation?

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2). In which one of the following rotors is preferred for low-speed alternators?

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3). Which one of the following prime movers is used in the salient pole rotors?

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4). Which one of the following rotors is mechanically robust?

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5). The small diameter and large axial length are the features of ___________________ rotor?

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6). Which one of the following comes under copper losses?

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7). What type of ring do alternators or synchronous generators have?


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8). Which one of the following is a type of single-layer winding?

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9). When coil span is equal to pole pitch then that winding is known as _________________?

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10). Which one of the following takes input from the stator?

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11). ____________________ are the abnormalities of an alternator or synchronous generator?

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12). Which one of the following comes under stator fault?

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13). Which one of the following methods is used to start the synchronous motor?

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14). In which one of the following the excitation is required?

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15). Which one of the following has more efficiency?

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16). Which one of the following is driven by a water turbine?

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17). What are the advantages of an armature as a stator?

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18). Which one of the following is an air-cooled turbo generator?

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19). The undefined loss is the cause of _____________ loss?

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20). Which one of the following takes input from the rotor?

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21). In which one of the following windings the end turns are shorter?

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22). The speed of the diesel engine prime mover is ____________ RPM?

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23). The cooling media is water in _______________ turbo generator?

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24). What is the standard form of UEL?

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25). Which one of the following methods is also known as the ampere turn method?

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Synchronous Generator MCQ for Quiz

26). In which one of the following generators, the speed range is up to 3000 RPM?

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27). In which one of the following generators the stator winding is directly water-cooled?

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28). What are the main components of the turbine?

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29). The specific speed of the Pelton wheel turbine is _____________ RPM?

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30). Which one of the following supports a wider range of RPM?

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31). The hysteresis and eddy current is the cause of _____________ loss?

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32). The amount of water striking the runner divided by the amount of water supplied to the turbine is known as _____________ efficiency?

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33). Which one of the following excitation systems is provided for a large-capacity generator?

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34). The field current capacity is lower in _____________ SCR?

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35). What are the disadvantages of diesel engines?

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36). In low head power plans the head of water is more than ___________________?

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37). What is the standard form of OEL?

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38). The specific speed of the Francis turbine is _____________ RPM?

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39). The rotor cooling is direct H2 in _____________ turbo generator?

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40). Which one of the following supports a lesser range of RPM?

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41). In which one of the following windings, the phase induction is low?

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42). Which one of the following is a hydrogen/water-cooled turbo generator?

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43). The power available at the turbine shaft divided by net power supplied at the turbine entrance is known as _____________ efficiency?

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44). In medium head power plans the head of water is more than ___________________?

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45). What is the standard form of SCL?

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46). The figure shown below is a block diagram of ____________ generator?

Synchronous Generator Block Diagram

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47). In which one of the following exciters the length of the machine is longer?

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48). In which one of the following exciters does the control respond very fast?

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49). The specific speed of the Kaplan turbine is _____________ RPM?

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50). In which one of the following post-installation polarization is not required?

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Synchronous Generator MCQ for Interviews

51). In which one of the following generators the speed range is from 100 to 1000 RPM?

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52). In which one of the following generators the rotor/winding/stator core is directly hydrogen-cooled?

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53). The speed of the gas turbine prime mover is ____________ RPM?

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54). The maximum capacity of the THDF turbo generator is _______________?

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55). The power developed by the runner divided by net power supplied at the turbine entrance is known as _____________ efficiency?

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56). What are the advantages of diesel engines?

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57). In high-head power plans the head of water is more than ___________________?

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58). What are the advantages of hydraulic power plants?

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59). The cooling media is hydrogen in _______________ turbo generator?

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60). Which one of the following can’t be used to charge a dead battery?

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61). In which one of the following windings the rotor losses are lower?

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62). Which one of the following rotors has large projecting poles?

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63). Which one of the following comes under mechanical losses?

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64). In which one of the following the voltage variation is possible?

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65). In which one of the following generators the stator winding is indirectly air-cooled?

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66). The air friction loss in the cooling fan mounted on the rotor shaft is the cause of _____________ loss?

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67). The cooling media is air in _______________ turbo generator?

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68). The power available at the turbine shaft divided by power developed by the runner is known as _____________ efficiency?

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69). Which one of the following excitation systems is provided for the low-capacity generator?

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70). In which one of the following is the brush durability higher?

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71). In which one of the following generators the rating is up to 1000 Mw?

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72). In which one of the following generators the rotor winding/stator core is directly air-cooled?

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73). In which one of the following exciters the response ratio selection is flexible?

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74). The static excitation system consists of ________________?

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75). In which one of the following windings, the synchronous winding factor is lower?

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Synchronous Generator MCQ for Students

76). The maximum capacity of the THRI turbo generator is _______________?

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77). Which one of the following excitation systems is provided for a high-capacity generator?

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78). In which one of the following exciter the length of the machine short?

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79). The stator cooling is indirect in _____________ turbo generator?

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80). Which one of the following is generally larger in size?

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81). In which one of the following the efficiency, cost, and inertia are high?

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82). The friction loss in bearings is the cause of _____________ loss?

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83). _______________ are the parameters of any generator decided by SCR?

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84). The maximum capacity of the TARI turbo generator is _______________?

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85). In which one of the following windings the back EMF is more sinusoidal?

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86). Which one of the following comes under rotor fault?

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87). The speed of the steam turbine prime mover is ____________ RPM?

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88). Which one of the following is a hydrogen-cooled turbo generator?

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89). Which one of the following methods is also known as the Potier triangle method?

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90). Which one of the following has a commutator mechanism?

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91). In which one of the following rotors the air gap is non-uniform?

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92). Which one of the following is driven by a steam turbine?

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93). In which one of the following generators the rating is up to 750 Mw?

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94). What are the main functions of an automatic voltage regulator system?

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95). Which one of the following windings is more difficult to manufacture?

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96). In which one of the following the isolated operation is possible?

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97). Which one of the following comes under magnetic losses?

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98). Which one of the following prime movers is used in the smooth cylindrical rotors?

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99). Which one of the following methods is also known as the EMF method?

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100). Which one of the following has less RPM?

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