ECE :: Network Analysis and Synthesis
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A magnetic circuit has an iron length of 20 cm and air gap length 0.1 cm. If μr = 200 then
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A circuit is fed by two sources of the same frequency and values 100 ∠0° V and 20 ∠30°V. The current in a particular branch is 5 ∠19° A. If the magnitudes of the sources and changed to 200 ∠0° V and 40 ∠30° V, the current in that branch should be
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Two coils X and Y have self inductances of 5 mH and 10 mH and mutual inductance of 3 mH. If the current in coils X change at a steady rate of 100 A/s, the emf induced in coil Y is
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Two capacitors of 2 μF and 4 μF capacitance are connected in series across a 30 V dc battery. After the capacitors have been charged, the voltage across them will be
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In the circuit shown in the figure, the current supplied by the sinusoidal current source I is
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The frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W1, W2 and W3. Then
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If figure, power dissipated in 30Ω resistance will be maximum when value of R =
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Two voltages are 50 ∠0 V and 75 ∠ - 60° V. The sum of these voltages is
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An RLC series circuit is fed form 100 V ac supply. Inductance is 1 H and Q = 7.5. At resonance, the voltage across inductance is