A.C circuit and networks. Part – 2

11. Time constant of an inductive circuit

A. Increases with increase of inductance and decrease of resistance

B. Increases with the increase of inductance and the increase of resistance

C. Increases with decrease of inductance and decrease of resistance

D. Increases with decrease of inductance and increase of resistance

12. Which among the following condition is true at the resonance?

A. X_C > X_L

B. X_C = X_L

C. X_C < X_L

D. none of the above

13. What would be the value of power factor for series RLC circuit under the resonance phenomenon?

A. infinity

B. 1

C. 0.5

D. 0

14. The rated voltage of 3-phase power system is given as

A. R.M.S. Phase voltage

B. R.M.S. Line to line voltage

C. Peak phase voltage

D. Peak line to line voltage

15. Creast factor of rectangular wave form is

A.

B. 1

C.

D.1/

16. The RMS value of sine wave is 100A then peak value is

A. 70.7A

B. 141A

C. 150A

D. 282.8A

17. Form factor of triangle wave form is

A. 1.11

B. 1.16

C. 1.0

D. 1.57

18. In R-L-C series circuit max voltage across the capacitor occurs at a frequency

A. Double of resonance frequency

B. Equal of resonance frequency

C.  time of resonance frequency

D. Below resonance frequency

19. Which one of the following has ability to act as an open circuit for D.C. and short circuit for A.C. at high frequency?

A. An inductor

B. A capacitor

C. A resistor

D. None of the above

20. A 10 mH inductor carries, sinusoidal current of 1A RMS at 50 Hz frequency the average power dissipated by inductor is

A. 0 watt

B. 0.25 watt

C. 0.5 watt

D. 1.0 watt