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

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 series and parallel resonance on L-C circuit’ differs in that_________?

   A. series resistance needs a low-resistance source for sharp rise in current
   B. series resonance needs a high-resistance source for sharp increase in current
   C. parallel resonance needs a low-resistance source for a sharp in¬crease in impedance
   D. parallel resonance needs a low-resistance source for a sharp rise in line current

3. The purpose of a parallel circuit resonance is to magnify________?

   A. current
   B. voltage
   C. power
   D. frequency

4. A parallel AC. circuit in resonance will__________?

   A. have a high voltage developed across each inductive and capacitive section
   B. have a high impedance
   C. act like a resistor of low value
   D. have current in each section equal to the line current

5. 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

6. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of__________?

   A. R only
   B. L only
   C. C only
   D. LorC
   E. R,LorC

7. The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?

   A. 180″
   B. 90°
   C. 60°
   D. 0°

8. 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

9. 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

10. 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