State and explain Kirchhoff’s laws.
[7 marks]Derive the equation of Star to Delta and Delta to Star transformation.
[7 marks]Give comparison between electric circuit and magnetic circuit.
[7 marks]An iron ring of mean length 1 m has air gap of 1 mm wound with 200 turns. The relative permeability is 500. If the current flow through coil is 1 A, calculate flux density.
[7 marks]Derive the equation of capacitance of parallel plate capacitor with uniform dielectric medium and with composite dielectric medium.
[7 marks]Two capacitors of capacity 2 μF and 4 μF are connected in series. Apotential difference of 900 V. Calculate: (i) Voltage across each capacitor (ii) Charge on each capacitor
[7 marks]Define (i) Frequency (ii) Peak Factor (iii) Average value (iv) Form factor
[7 marks]Power factor (vi) Instantaneous value (vii) Amplitude
[ marks]The following expressions represent the instantaneous values of e.m.f. in three coils connected in series e1 = 50 sin ωt e2 = 40 sin(ωt+60°) e3 = 60 sin (ωt-30°) Find an expression for the resultant e.m.f.
[7 marks]Explain series R-L-Ccircuit with the phasor diagram.
[7 marks]Prove that average power consumption in pure inductor is zero when A.C. voltage is applied.
[7 marks]Derive the relation between line voltage and phase voltage, line current and phase current in star connection.
[7 marks]What is the construction of three core cable? Explain each parts and its importance
[7 marks]Explain charging of battery from AC supply with schematic diagram
[7 marks]Explain the working of earth leakage circuit breaker (ELCB) with diagram.
[7 marks]