What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value________ ?

Related Mcqs:

1. Two waves of the same frequency have opposite phase when the phase angle between them is_________?

   A. 360°
   B. 180°
   C. 90°
   D. 0°

2. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?

   A. 282.8 V
   B. 141.4 V
   C. 111 V
   D. 100 V

3. 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?

   A. 2.5
   B. 5
   C. 10
   D. 15

4. If two sine waves of the same frequency have a phase difference of JT radians, then_______?

   A. both will reach their minimum values at the same instant
   B. both will reach their maximum values at the same instant
   C. when one wave reaches its maxi¬mum value, the other will reach its minimum value
   D. none of the above

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

   A. 100 n
   B. 50 jt
   C. 25 JT
   D. 5 n

6. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?

   A. 220 V
   B. 220V3V
   C. 220/V3 V
   D. none of the above

7. The frequency of an alternating current is____________?

   A. the speed with which the alternator runs
   B. the number of cycles generated in one minute
   C. the number of waves passing through a point in one second
   D. the number of electrons passing through a point in one second

8. The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?

   A. 90
   B. 60
   C. 45
   D. 30

9. The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

   A. both waves must have same frequency
   B. both waves must have identical peak values
   C. both waves must have zero value at the same time
   D. none of the above

10. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?

    A. the more heat than produced by A.C. when flowing through the same circuit
    B. the same heat as produced by A.C. when flowing through the same circuit
    C. the less heat than produced by A.C. flowing through the same circuit
    D. none of the above