Answer: 0.005 s

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Questions

2
For a sine wave with peak value Emax______8.30. the average value is

Answer: 0.636 Emax

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6
For the same peak value, which of the following wave has the least mean value ?

Answer: half wave rectified sine wave

7
For the same peak value which of the following wave will ‘have the highest r.m.s. value ?

Answer: square wave

9
The power consumed in a circuit element will be least when the phase difference between the current and voltage is

Answer: 90°

10
Two waves of the same frequency have opposite phase when the phase angle between them is

Answer: 180°

12
If two sine waves of the same frequency have a phase difference of JT radians, then

Answer: when one wave reaches its maxi¬mum value, the other will reach its minimum value

14
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

Answer: a sinusoid of the same frequency

15
A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to

Answer: r.m.s. voltage

19
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.

Answer: 10

20
A sine wave has a frequency of 50 Hz. Its angular frequency is _______ radian/second.

Answer: 100 n

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