The power is measured in terms of decibles in case of_________?

Related Mcqs:

1. 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

2. The ratio of active power to apparent power is known as factor__________?

   A. demand
   B. load
   C. power
   D. form

3. 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

4. The r.m.s. value and mean value is the same in the case of___________?

   A. triangular wave
   B. sine wave
   C. square wave
   D. half wave rectified sine wave

5. In the case of an unsymmetrical alternating current the average value must always be taken over__________?

   A. unsymmetrical part of the wave form
   B. the quarter cycle
   C. the half cycle
   D. the whole cycle

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. In a circuit containing R, L and C, power loss can take place in____________?

   A. C only
   B. L only
   C. R only
   D. all 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