All definitions of power factor of a series R-L-C circuit are correct except__________?

Related Mcqs:

1. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?

   A. 12 kW
   B. 22 kW
   C. 32 kW
   D. 64 kW

2. The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?

   A. 4 kVAR
   B. 6 kVAR
   C. 8 kVAR
   D. 16 kVAR

3. In a series resonant circuit, the impedance of the circuit is___________?

   A. minimum
   B. maximum
   C. zero
   D. none of the above

4. 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

5. Power factor of an electrical circuit is equal to____________?

   A. R/Z
   B. cosine of phase angle difference be-tween current and voltage
   C. kW/kVA
   D. ratio of useful current to total cur¬rent Iw/I
   E. all of these

6. 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

7. Power factor of the following circuit will be unity

   A. inductance
   B. capacitance
   C. resistance
   D. both A. and B.

8. Power factor of the following circuit will be zero__________?

   A. resistance
   B. inductance
   C. capacitance
   D. both B. and C.

9. The power factor at resonance in R-L- C parallel circuit is________?

   A. zero
   B. 0.08 lagging
   C. 0.8 leading
   D. unity

10. The power factor of a D.C. circuit is always__________?

    A. less than unity
    B. unity
    C. greater than unity
    D. zero