Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?

Related Mcqs:

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

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

2. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?

   A. 0.001 s
   B. 0.1 s
   C. 10 s
   D. 100 s

3. In a series resonant circuit, the impedance of the circuit is___________?

   A. minimum
   B. maximum
   C. zero
   D. none of the above

4. 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

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. 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

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. 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

9. 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

10. 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