Q.11- The laws of electromagnetic induction (Faraday's law and Lenz's law) are summarized in following equation: (a) e-iR (b) e = La di dt (c) e = dop dt (d) None of these (Gate EE 1998) Q.12- An inductive coil has a resistance of 5 Q2 and inductance of 15.6 mH. It is connected across a 200 V, 50 HZ supply. Find current drawn from supply, Voltage across resistance and inductance, power factor ofthe circuit. Q.13- A 100 resistance is connected in series with choke coil. When a 440 V, 50 HZ single phase alternating voltage is applied to this combination, the voltage across the resistance and chock coil are 200 V and 300 V respectively. Calculate (i) Resistance and inductance of the coil, (ii) The total resistance andimpedance of circuit, (iii) The power absorbed by the chock coil and the circuit. Q.14- The voltage and current in series circuit are V-2002 sin (314t-30) and I-202 sin (314t+30) Determine (i) Circuit elements (ii) power factor of circuit (iii) Active Reactive and apparent power (iv) Draw triangles. Q.15- A coil having a resistance of 50 and inductance of (1/) H is connected in series with a capacitor of(100/) F. A 200 V, 50 Hz alternating voltage source is applied across the circuit. (i) Find the total impedance of the circuit. (ii) Find the current flowing through the voltage source. (iii) Find the voltage across R.L.C components. (iv) Draw the phasor diagram. Q.16- Write a short note on series resonance in ac circuits.