Power factor of electric bulb 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 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. 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°

4. When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?

   A. apparent power
   B. true power
   C. reactive power
   D. none of the above

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 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. Power factor of the system is kept high__________?

   A. to reduce line losses
   B. to maximise the utilization of the capacities of generators, lines and transformers
   C. to reduce voltage regulation of the line
   D. due to all above reasons

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

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

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