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

Related Mcqs:

1. In any A.C. circuit always__________?

   A. apparent power is more than actual power
   B. reactive power is more than apparent power
   C. actual power is more than reactive power
   D. reactive power is more than actual power

2. 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

3. 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

4. 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

5. 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

6. Power factor of the following circuit will be unity

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

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

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

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

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

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

   A. ratio of net reactance and impedance
   B. ratio of kW and kVA
   C. ratio of J and Z
   D. ratio of W and VA

10. All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?

    A. capacitance only
    B. inductance only
    C. resistance only
    D. all above