AC Fundamentals Online Quiz practies questions test1

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1. A sine wave has a frequency of 50 Hz. Its angular frequency is _______ radian/second.
100 n	50 jt
25 JT	5 n

2. The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.
2.5	5
10	15

3. The period of a wave is ______.
the same as frequency	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 a sine wave is 1 / 50 seconds. Its frequency is ______.
20 Hz	30 Hz
40 Hz	50 Hz

6. A heater is rated as 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 the same frequency but of different amplitudes and phase angles are subtracted, the resultant 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 a sine wave is 200 V. Its average value is ______.
127.4 V	141.4 V
282.8 V	200 V

9. If two sine waves of the same frequency have a phase difference of JT radians, then ______.
both will reach their minimum values at the same instant	both will reach their maximum values at the same instant
when one wave reaches its maxi¬mum value, the other will reach its minimum value	none of the above

10. The voltage of domestic supply is 220V. This figure represents ______.
mean value	r.m.s. value
peak value	average value

11. Two waves of the same frequency have opposite phase when the phase angle between them is _____.
360°	180°
90°	0°

12. The power consumed in a circuit element will be least when the phase difference between the current and voltage is _____.
180°	90°
60°	0°

13. The r.m.s. value and mean value is the same in the case of _____.
triangular wave	sine wave
square wave	half wave rectified sine wave

14. For the same peak value which of the following wave will 'have the highest r.m.s. value ?
square wave	half wave rectified sine wave
triangular wave	sine wave

15. For the same peak value, which of the following wave has the least mean value ?
half wave rectified sine wave	triangular wave
sine wave	square wave

16. For a sine wave with peak value Imax the r.m.s. value is ______.
0.5 Imax	0.707
0.9	1.414 Lmax

17. Form Factor is the ratio of ______.
average value/r.m.s. value	average value/peak value
r.m.s. value/average value	r.m.s. value/peak value

18. Form factor for a sine wave is _____.
1.414	0.707
1.11	0.637

19. For a sine wave with peak value Emax______8.30. the average value is
0.636 Emax	0.707 Emax
0.434 EWc	lAUEmax

20. For a frequency of 200 Hz, the time period will be _____.
0.05 s	0.005 s
0.0005 s	0.5 s