# AC Circuits ( part 1 ) MCQs with Answers

### Chapter 2. AC Circuits

1. The variation of a quantity such as voltage or current shown on a graph is known as
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

2. The variation of a quantity such as voltage or current shown on a graph is known as
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

3. The variation of a quantity such as voltage or current shown on a graph is known as
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

4. The variation of a quantity such as voltage or current shown on a graph is known as
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

5. What is the duration of one cycle knownas
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

6. What is the duration of one cycle known as
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

7. What is the duration of one cycle known as
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

8. What is the duration of one cycle known as
(a) Waveform
(b) Peak value
(c) Instantaneous value
(d) Period

9. The repetition of a variable quantity, recurring at equal intervals, is known as
(a) Waveform

(b) Instantaneous value
(c) Cycle
(d) Period

10. The repetition of a variable quantity, recurring at equal intervals, is known as
(a) Waveform
(b) Instantaneous value
(c) Cycle
(d) Period

11. The repetition of a variable quantity, recurring at equal intervals, is known as
(a) Waveform
(b) Instantaneous value
(c) Cycle
(d) Period

12. The repetition of a variable quantity, recurring at equal intervals, is known as
(a) Waveform
(b) Instantaneous value
(c) Cycle
(d) Period

13. The value of a given waveform at any instant time os termed as
(a) Waveform
(b) Instantaneous value
(c) Cycle
(d) Period

14. The value of a given waveform at any instant time os termed as
(a) Waveform
(b) Instantaneous value
(c) Cycle
(d) Period

15. The value of a given waveform at any instant time os termed as
(a) Waveform
(b) Instantaneous value
(c) Cycle
(d) Period

16. The value of a given waveform at any instant time os termed as
(a) Waveform
(b) Instantaneous value
(c) Cycle
(d) Period

17. The maximum instantaneous value measured from zero value is known as
(a) Peak value
(b) Peak to Peak value
(c) Cycle
(d) Period

18. The maximum instantaneous value measured from zero value is known as
(a) Peak value
(b) Peak to Peak value
(c) Cycle
(d) Period

19. The maximum instantaneous value measured from zero value is known as
(a) Peak value
(b) Peak to Peak value
(c) Cycle
(d) Period

20. The maximum instantaneous value measured from zero value is known as
(a) Peak value
(b) Peak to Peak value
(c) Cycle
(d) Period

21. RMS stands for
(a) Root Mean Square
(b) Root Mean Sum
(c) Root Maximum Sum
(d) Root Minimum Sum

22. RMS stands for
(a) Root Mean Square

(b) Root Mean Sum
(c) Root Maximum Sum
(d) Root Minimum Sum

23. RMS stands for
(a) Root Mean Square
(b) Root Mean Sum
(c) Root Maximum Sum
(d) Root Minimum Sum

24. RMS stands for
(a) Root Mean Square
(b) Root Mean Sum
(c) Root Maximum Sum
(d) Root Minimum Sum

25. In a sinusoidal wave, average current is always ________ rms current.
(a) Greater than
(b) Less than
(c) Equal to
(d) Not related

26. In a sinusoidal wave, average current is always ________ rms current.
(a) Greater than
(b) Less than
(c) Equal to
(d) Not related

27. In a sinusoidal wave, average current is always ________ rms current.
(a) Greater than
(b) Less than
(c) Equal to
(d) Not related

28. In a sinusoidal wave, average current is always ________ rms current.
(a) Greater than
(b) Less than
(c) Equal to
(d) Not related

29. Peak value divided by the rms value gives us
(a) Peak factor
(b) Crest factor
(c) Both peak and crest factor
(d) Neither peak nor crest factor

30. Peak value divided by the rms value gives us
(a) Peak factor
(b) Crest factor
(c) Both peak and crest factor
(d) Neither peak nor crest factor

31. Peak value divided by the rms value gives us
(a) Peak factor
(b) Crest factor
(c) Both peak and crest factor
(d) Neither peak nor crest factor

32. Peak value divided by the rms value gives us
(a) Peak factor
(b) Crest factor
(c) Both peak and crest factor
(d) Neither peak nor crest factor

33. The time axis of an ac phasor represents?
(a) Time
(b) Phase angle
(c) Voltage
(d) Current

34. The time axis of an ac phasor represents?
(a) Time
(b) Phase angle
(c) Voltage
(d) Current

35. The time axis of an ac phasor represents?
(a) Time

(b) Phase angle
(c) Voltage
(d) Current

36. The time axis of an ac phasor represents?
(a) Time
(b) Phase angle
(c) Voltage
(d) Current

37. The length of the phasor represents?
(a) Magnitude of the quantity
(b) Direction of the quantity
(c) Neither magnitude nor direction
(d) Either magnitude or direction

38. The length of the phasor represents?
(a) Magnitude of the quantity
(b) Direction of the quantity
(c) Neither magnitude nor direction
(d) Either magnitude or direction

39. The length of the phasor represents?
(a) Magnitude of the quantity
(b) Direction of the quantity
(c) Neither magnitude nor direction
(d) Either magnitude or direction

40. The length of the phasor represents?
(a) Magnitude of the quantity
(b) Direction of the quantity
(c) Neither magnitude nor direction
(d) Either magnitude or direction

41. The rms value is ______ times the maximum value.
(a) 1.414
(b) 0.5
(c) 2
(d) 0.707

42. The rms value is ______ times the maximum value.
(a) 1.414
(b) 0.5
(c) 2
(d) 0.707

43. The rms value is ______ times the maximum value.
(a) 1.414
(b) 0.5
(c) 2
(d) 0.707

44. The rms value is ______ times the maximum value.
(a) 1.414
(b) 0.5
(c) 2
(d) 0.707

45. Usually phasor diagrams are drawn representing?
(a) RMS value
(b) Peak value
(c) Average value
(d) Instantaneous value

46. Usually phasor diagrams are drawn representing?
(a) RMS value
(b) Peak value
(c) Average value
(d) Instantaneous value

47. Usually phasor diagrams are drawn representing?
(a) RMS value
(b) Peak value
(c) Average value
(d) Instantaneous value

48. Usually phasor diagrams are drawn representing?
(a) RMS value

(b) Peak value
(c) Average value
(d) Instantaneous value

49. The resultant of two alternating sinusoidal voltages or currents can be found using
(a) Triangular law
(b) Parallelogram law
(c) Either triangular or parallelogram law
(d) Neither triangular nor parallelogram law

50. The resultant of two alternating sinusoidal voltages or currents can be found using
(a) Triangular law
(b) Parallelogram law
(c) Either triangular or parallelogram law
(d) Neither triangular nor parallelogram law

51. The resultant of two alternating sinusoidal voltages or currents can be found using
(a) Triangular law
(b) Parallelogram law
(c) Either triangular or parallelogram law
(d) Neither triangular nor parallelogram law

52. The resultant of two alternating sinusoidal voltages or currents can be found using
(a) Triangular law
(b) Parallelogram law
(c) Either triangular or parallelogram law
(d) Neither triangular nor parallelogram law

53. The power for a purely resistive circuit is zero, when?
(a) Current is zero
(b) Voltage is zero
(c) Both current and voltage are zero
(d) Either current or voltage is zero

54. The power for a purely resistive circuit is zero, when?
(a) Current is zero
(b) Voltage is zero
(c) Both current and voltage are zero
(d) Either current or voltage is zero

55. The power for a purely resistive circuit is zero, when?
(a) Current is zero
(b) Voltage is zero
(c) Both current and voltage are zero
(d) Either current or voltage is zero

56. The power for a purely resistive circuit is zero, when?
(a) Current is zero
(b) Voltage is zero
(c) Both current and voltage are zero
(d) Either current or voltage is zero

57. Inductor does not allow sudden changes in?
(a) Voltage
(b) Current
(c) Resistance
(d) Inductance

58. Inductor does not allow sudden changes in?
(a) Voltage
(b) Current
(c) Resistance
(d) Inductance

59. Inductor does not allow sudden changes in?
(a) Voltage
(b) Current
(c) Resistance
(d) Inductance

60. Inductor does not allow sudden changes in?
(a) Voltage
(b) Current
(c) Resistance
(d) Inductance