1. (a) Find the current delivered by the source for the network shown in figure 1a
using network reductions technique.
(b) (b) Find the value of applied d.c. voltage for the network, shown in figure 1b.
2. State Faraday’s law of Electromagnetic Induction. Two coils A & B are wound on
same ferromagnetic core. There are 300 turns on A & 2800 turns on B. A current
of 4A through coil A produces a flux of 800µWb in the core. If this current is
reversed in 20 ms, find the average emf induced in coils A & B.
3. (a)For the trapezoidal waveform shown in the figure 3, determine. (a) Average and rms values.
(b) Form factor.
(c) Peak factr.
4.(a) A balanced delta connected load is supplied from a symmetrical, 3-phase, 400V,
50Hz supply system. The current in each phase is 20A and lags behind its phase
voltage by an angle 400. Calculate. (a) The line current.
(b) Total power.
(c) Also draw the phasor diagram showing the voltages and currents in the lines
and the phases.
(d) The wattmeter readings if two wattmeters are used.
5.(a) For the resistive network as shown in figure 5 write a tie-set schedule and equilibrium
equations on current basis. Determine the branch currents and branch voltages.
6.(a) (a) Find the value of RL so that maximum power is delivered to the load resistance
RL as shown in figure 6a, and find the maximum power.
(b)State and explain Thevenin’s theorem.
7.In the circuit shown in the figure 7, the switch is put in position - 1 for 1 m sec
and then thrown to position - 2. Find the transient current in both intervals.
8.8. (a)Find the Z and Y parameters of the circuit shown in figure 8.