If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?

Related Mcqs:

1. 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

2. 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

3. The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?

   A. 60 sin 25 t
   B. 60 sin 50 t
   C. 84.84 sin 3141
   D. 42.42 sin 314 t

4. 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

5. 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

6. The period of a sine wave is _____ seconds. Its frequency is

   A. 20 Hz
   B. 30 Hz
   C. 40 Hz
   D. 50 Hz

7. 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________ ?

   A. 0°
   B. 45°
   C. 90°
   D. 180°

8. 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

9. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?

   A. be reduced by half
   B. be doubled
   C. be four times at high
   D. be reduced to one fourth

10. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?

    A. be reduced by half
    B. be doubled
    C. be four times as high
    D. be reduced to one fourth