Related Mcqs:

1. 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°

2. The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

   A. both waves must have same frequency
   B. both waves must have identical peak values
   C. both waves must have zero value at the same time
   D. none of the above

3. The product of apparent power and cosine of the phase angle between circuit voltage and current is

   A. true power
   B. reactive power
   C. volt-amperes
   D. instantaneous power

4. 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

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. Which of the following circuit component opposes the change in the circuit voltage ?

   A. Inductance
   B. Capacitance
   C. Conductance
   D. Resistance

7. A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?

   A. the capacitive reactance in ohms
   B. the current flowing in capacitor
   C. the size of the capacitor being quite big
   D. the statement is incorrect

8. In a parallel R-C circuit, the current always________the applied voltage?

   A. lags
   B. leads
   C. remains in phase with
   D. none of the above

9. In a loss-free R-L-C circuit the transient current is__________?

   A. oscillating
   B. square wave
   C. sinusoidal
   D. non-oscillating

10. Two waves of the same frequency have opposite phase when the phase angle between them is_________?

    A. 360°
    B. 180°
    C. 90°
    D. 0°