b) Define the terms (i) node (ii) branch. (2M)
c) Define RMS value and Average value. (2M)
d) Define power factor. Why is it important? (2M)
e) What are the losses occurring in a transformer? (2M)
f) Explain the working principle of a transformer. (2M)
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g) What is the function of commutator in DC machine? (2M)
h) Write the principle of operation of DC motor. (2M)
i) Define slip and its effect on the performance of induction motor. (2M)
j) List the applications of induction motors. (2M)
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PART-B (4 * 12.5 = 50 Marks)
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a) Calculate the equivalent resistance between the terminals A and B in the circuit shown in below Figure. (6.5M)
b) State and explain Kirchhoff’s laws. (6M)
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Using Nodal analysis, determine the current through each resistor in the circuit shown in below Figure. (12.5M)
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a) Derive the EMF equation of an AC generator. (6.5M)
b) Explain the concept of impedance and admittance in AC circuits. (6M)
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A series RLC circuit with R = 10 Ω, L = 0.1 H, and C = 50 μF is connected to a 200 V, 50 Hz AC source. Calculate the impedance, current, power factor, and the voltage across each element. (12.5M)
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a) Derive the EMF equation of a transformer. (6.5M)
b) Explain the different types of transformers based on construction. (6M)
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A 200 kVA, 3300/400 V, 50 Hz single-phase transformer has 80 turns on the secondary winding. Assuming an ideal transformer, calculate: i) Primary and secondary currents, ii) Number of primary turns, iii) Maximum value of flux in the core. (12.5M)
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a) Explain the constructional details of a DC machine with neat diagrams. (6.5M)
b) Explain the working principle of DC generator. (6M)
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Explain the working principle of three-phase induction motor and derive the expression for torque. (12.5M)
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