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Alternating Current and Voltage Question & Answers

September 13, 2021 By Wat Electrical Leave a Comment

This article lists 100 Alternating Current and Voltage MCQs for engineering students. All the Alternating Current and Voltage Questions & Answers given below includes solution and link wherever possible to the relevant topic.

In the 1880s the DC was discovered by Thomas Edison and the AC was discovered by Nikola Tesla. The electricity we use in our homes and offices is generated in power stations. The electricity produced in power stations is delivered by transmission lines over a long distance, and the amount of power generated is given by a product of current and voltage. In India, the electricity standards are 230 volts and 50 hertz.

1). The power factor of an AC voltage lies between ______________

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2). The alternating current voltage have _______________

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3). Which one of the following requires for transmission?

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4). Which one of the following doesn’t have amplitude?

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5). The passive parameter in an AC voltage is _________

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6). The ratio of real power divided by apparent power is known as _____________

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7). The expression for capacitive reactance is given by _____________

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8). The ratio f reactive power divided by apparent power is known as __________

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9). Which one of the following voltages is obtained from a generator?

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10). Which one of the following voltages is unidirectional?


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11). Which one of the following currents is discovered by Thomas Edison?

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12). Which one of the following currents is discovered by Nikola Tesla?

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13). The expression for inductive reactance is given by _____________

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14). The expression for power loss is equal to ___________

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15). In India the electricity standards are _____________

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16). In US the electricity standards are _____________

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17). How many cycles does AC produce per second?

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18). The period of a wave is related to ___________ quantity

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19). The frequency of a wave is related to ___________ quantity

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20). Which one of the following is expressed in seconds per cycle?

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21). Which one of the following is expressed in cycles per second?

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22). The expression for voltage amplitude is given by _____________

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23). The frequency is _________ if the period is longer

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24). The period is _________ if the frequency is higher

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25). What is the unit to measure bandwidth?

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Alternating Current and Voltage Important MCQs

26). The induced EMF is categorized into ________________

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27). The statically induced EMF is categorized into _______________

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28). In _______________ phase the power supplies through one conductor

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29). The number of wires required for completing the single-phase circuit is ____________

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30). The single-phase alternating current circuit carries ____________

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31). In which one of the following phases the efficiency is high?

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32). In _______________ phase the power supplies through three conductors

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33). Which one of the following phases is more economical?

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34). The loss is maximum in __________ phase

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35). The phase impedances in balanced load are equal in __________

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36). The transmission efficiency is high in __________ phase system

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37). The cross-sectional area of conductors are large in _________ phase system

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Read more about Electrical Conductors
38). In which one of the following voltage the polarity is fixed?

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39). The number of wires required for completing the three-phase circuit is ____________

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40). Which one of the following is easier to measure?

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41). Which one of the following is easier to amplify?

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42). The RMS value of the sine waveform is __________

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43). The crest factor value of sine waveform is ____________

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44). The three-phase alternating current circuit carries ____________

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45). The form factor value of sine waveform is ____________

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46). The ratio of RMS value divided by average value is known as ____________ factor

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47). The ripple factor is defined as a ratio of _______________

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48). Which one of the following phase networks is complicated?

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49). The RMS value of the triangular waveform is __________

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50). The crest factor value of the triangular waveform is ____________

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Alternating Current and Voltage MCQs for Quiz

51). The form factor value of the triangular waveform is ____________

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52). The mean value of the sine wave is ____________

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53). The peak to average power ratio of sine wave is _______________

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54). The ratio of peak value divided by RMS value is known as ____________ factor

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55). The power factor of the series resonance circuit is ________________

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56). The RMS value of the square waveform is __________

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57). The crest factor value of the square waveform is ____________

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58). The form factor value of the square waveform is ____________

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59). The mean value of the half-wave rectified sine is ____________

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60). Which one of the following circuits magnifies voltage?

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61). Which one of the following circuits is also known as the acceptor circuit?

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62). The power factor at resonance is unity in ______________ circuit

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63). The ratio of inductor voltage or capacitor voltage by supply voltage is known as ___________ factor

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64). The RMS value of saw-tooth waveform is __________

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65). The crest factor value of saw-tooth waveform is ____________

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66). The form factor value of saw-tooth waveform is ____________

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67). The mean value of full-wave rectified sine is ____________

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68). The peak to average power ratio of full-wave rectified sine is ____________

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69). Which one of the following circuits magnifies current?

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70). Which one of the following circuits is also known as the rejector circuit?

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71). The ratio of bandwidth divided by resonant frequency is known as _____________

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72). What is the unit of self-inductance?

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73). How many types of inductance are there?

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74). The mean value of triangular wave is ____________

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75). The peak to average power ratio of half-wave rectified sine is ____________

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Alternating Current and Voltage MCQs for Students

Read more about Rectifier
76). Which one of the following is a correct expression for resonant angular frequency?

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77). Which one of the following is a capacitive reactance equation?

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78). Which one of the following is an inductive reactance equation?

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79). The root mean square of the current is known as ______________

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80). How many ways are there to measure the alternating current and voltage?

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81). Which one of the following is a current expression for angular velocity?

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82). Which one of the following is also known as the amplitude factor?

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83). The peak to average power ratio of the triangular wave is ____________

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84). The root mean square of the voltage is known as ______________

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85). What are the advantages of an alternating current?

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86). The magnetic field is stationary in ____________ motor

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87). The armature is stationary in ______________ motor

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88). Which one of the following generators doesn’t have a commutator?

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89). Which one of the following motors doesn’t use brushes?

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90). What are the advantages of an AC motor?

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91). The number of terminals in an AC motor is ____________

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92). The mean value of the square wave is ____________

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93). The peak to average power ratio of the square wave is ____________

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94). Which one of the following cannot produce the chemical effects of current?

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95). The DC can be converted into an AC by using _____________

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96). The electrons in _____________ current moves only in one direction

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97). The stability problems are less in _____________ servomotors

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98). The efficiency is high in _____________ current servomotors

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Read more about AC Motors
99). Which one of the following motors is self-starting?

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100). Which one of the following is a type of AC motor?

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