Time constant of an inductive circuit_________?

Related Mcqs:

1. In a R-L-C circuit_________?

   A. power is consumed in resistance and is equal to I R
   B. exchange of power takes place between inductor and supply line
   C. exchange of power takes place between capacitor and supply line
   D. exchange of power does not take place between resistance and the supply line
   E. all above are correct

2. 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

3. Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?

   A. parallel
   B. series
   C. either A. or (b)
   D. none of the above

4. Pure inductive circuit____________?

   A. consumes some power on average
   B. does not take power at all from a line
   C. takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
   D. none of the above

5. In a pure inductive circuit___________?

   A. the current is in phase with the voltage
   B. the current lags behind the voltage by 90°
   C. the current leads the voltage by 90°
   D. the current can lead or lag by 90°

6. 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

7. Pure inductive circuit takes power from the A.C. line when_________?

   A. applied voltage decreases but current increases
   B. applied voltage increases but current decreases
   C. both applied voltage and current increase
   D. both applied voltage and current decrease

8. In a purely inductive circuit__________?

   A. actual power is zero
   B. reactive power is zero
   C. apparent power is zero
   D. none of above is zero

9. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?

   A. 0.001 s
   B. 0.1 s
   C. 10 s
   D. 100 s

10. The time constant of a series R-C circuit is given by____________?

    A. R/C
    B. RC2
    C. RC
    D. R2C