The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?

Related Mcqs:

1. 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...

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?

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

3. 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...

4. 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...

5. The frequency of domestic power supply in Pakistan is_________?

   A. 200 Hz B. 100 Hz C. 60 Hz D. 50 Hz...

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

   A. 360° B. 180° C. 90° D. 0°...

8. 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...

9. 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°...

10. In a series L-C circuit at the resonant frequency the__________?

    A. current is maximum B. current is minimum C. impedance is maximum D. voltage across C is minimum...