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. **

- 100 n
- 50 JT
- 25 JT
- 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.**

- 2.5
- 5
- 10
- 15

**3. The period of a wave is**

- the same as the frequency
- the time required to complete one cycle
- expressed in amperes
- none of the above

**4. The form factor is the ratio of**

- peak value to r.m.s. value
- r.m.s. Value to average value
- average value to r.m.s. value
- none of the above

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

- 20 Hz
- 30 Hz
- 40 Hz
- 50 Hz

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

- average voltage
- r.m.s. voltage
- peak voltage
- none of the above

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

- a sinusoid of the same frequency
- a sinusoid of half the original frequency
- a sinusoid of double the frequency
- not a sinusoid

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

- 127.4 V
- 141.4 V
- 282.8 V
- 200V

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

- both will reach their minimum values at same time
- both will reach their maximum values at same time
- when one wave reaches its maximum value, other will reach its minimum value
- none of the above

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

- mean value
- r.m.s. value
- peak value
- average value