Chapter 5. 5. A.C. FUNDAMENTALS. .1. ALTERNATING CURRENT AND VOLTAGE. MCQs

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1. . Current (or voltage) is said to be alternating when it changes in:





2. . The working principle of the AC generator is:





3. . The number of cycles per second in any conductor is called:





4. . The unit of frequency is:





5. . Frequency in PAKISTAN is:





6. . The sine wave which completes 50 cycles per second, its frequency will be:





7. . One complete set of positive and negative values of an alternating quantity is known as:





8. . During each cycle, a sine wave reaches a peak value:





9. . If the frequency is 1 Hz, then time is:





10. . When a sine wave has a frequency of 60 Hz, in 10 s it goes through:





11. . 110 volts peak value is approximately equal to RMS value:





12. . The form factor is the ratio of:





13. . A 10 V RMS value is approximately equal to peak value:





14. . A sine wave reaches maximum positive voltage at:





15. . Average value of 10 V peak sine wave over one complete cycle is:





16. . Average half-cycle value of sine wave with 20 V peak is:





17. . If the peak value of sine wave is 10 V, the peak-to-peak value is:





18. . If the peak value of sine wave is 20 V, the RMS value is:





19. . Value of an alternating current at any instant is:





20. . RMS value of the current in sine wave is:





21. . Average value of current in sine wave is:





22. . Time period of sine wave with frequency 50 c/s is:





23. . Sine wave equation of current can be written as:





24. . Ratio of RMS value to average value is called:





25. . Form factor =





26. . Ratio between RMS value and average value is called:





27. . Value of form factor is:





28. . Value of peak-to-peak factor is:





29. . Maximum value of sine wave is 10 A, RMS value is:





30. . 50 c/s frequency sine wave has time period:





31. . When two AC waves with same frequency start & finish from same point, they are called:





32. . Waveform behind the other waveform w.r.t time or angle is called:





33. . Waveform ahead of the other waveform w.r.t time or angle is called:





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