Related Mcqs:

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

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

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 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. 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

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

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

6. 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

7. In a highly capacitive circuit the__________?

   A. apparent power is equal to the actual power
   B. reactive power is more than the apparent power
   C. reactive power is more than the actual power
   D. actual power is more than its reactive power

8. The time constant of the capacitance circuit is defined as the time during which voltage________?

   A. falls to 36.8% of its final steady value
   B. rises to 38.6% of its final steady value
   C. rises to 63.2% of its final steady value
   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. Which of the following refers to a parallel circuit ?

    A. The current through each element is same
    B. The voltage across element is in proportion to it’s resistance value
    C. The equivalent resistance is greater than any one of the resistors
    D. The current through any one element is less than the source current