AC Fundamentals MCQ

Solve MCQ of AC Fundamentals  ,here given lots of unique mcq for you.It can be very help full for your electrical engineering exam or competitive exams.

AC Fundamentals MCQ


1.A sine wave has frequency of 50 Hz. Its angular frequency is _______radian/second. 

  1. 100 n
  2. 50 JT
  3. 25 JT
  4. 5 n

2. The reactance offered by capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, so reactance is_____ohms.

  1. 2.5
  2. 5
  3. 10
  4. 15

3. The period of a wave is

  1. the same as the frequency
  2. the time required to complete one cycle
  3. expressed in amperes
  4. none of the above

4. The form factor is the ratio of

  1. peak value to r.m.s. value
  2. r.m.s. Value to average value
  3. average value to r.m.s. value
  4. none of the above

5. The period of sine wave is 0.02 seconds. Its frequency is___

    1. 20 Hz
    2. 30 Hz
    3. 40 Hz
    4. 50 Hz

6. A heater is rated at 230 V, 10 kW, A.C. The value 230 V refers to

    1. average voltage
    2. r.m.s. voltage
    3. peak voltage
    4. none of the above

7. If two sinusoids of same frequency but of different amplitudes and phase angles are subtracted, then result is___

  1. a sinusoid of the same frequency
  2. a sinusoid of half the original frequency
  3. a sinusoid of double the frequency
  4. not a sinusoid

8. The peak value of sine wave is 200 V. Its average value is___

  1. 127.4 V
  2. 141.4 V
  3. 282.8 V
  4. 200V

9. If two sine waves of same frequency have phase difference of JT radians, then___

  1. both will reach their minimum values at same time
  2. both will reach their maximum values at same time
  3. when one wave reaches its maximum value, other will reach its minimum value
  4. none of the above

10. The voltage of the domestic supply is 220V. This figure represents

    1. mean value
    2. r.m.s. value
    3. peak value
    4. average value
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