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PART – B 3*10=30 Marks
UNIT-I
- a) State and explain Kirchhoff’s Laws.
b) A resistance of 5 Ω is connected in series with a parallel combination of two resistors of 12 Ω and 6 Ω respectively. Calculate the equivalent resistance of the circuit. (5M+5M) - Determine the current flowing through 5 Ω resistor using nodal analysis for the circuit shown in below figure. (10M)
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UNIT-II
- a) Define and explain Faraday’s laws of electromagnetic induction.
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b) Derive the EMF equation of single phase transformer. (5M+5M) - Explain the constructional details of DC Machine with neat diagram. (10M)
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UNIT-III
- A series RLC circuit with R = 10 Ω, L = 0.5 H and C = 40 µF is connected to a 230 V variable frequency supply. Calculate the following.
(i) The resonant frequency.--- Content provided by FirstRanker.com ---
(ii) The current at resonance.
(iii) The voltage across the inductor at resonance. (10M) - A 50 Hz voltage of 230 V effective value is applied to a coil of which the resistance is 5 Ω and the inductance is 0.025 H. Find
(i)Impedance
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(iii)Power factor (10M)
UNIT-IV
- a) Derive the relation between line and phase voltages and currents in star connected system.
b) A 3-phase delta connected load has ZAB = (15 + j20) Ω, ZBC = (10 – j10) Ω and ZCA = j5 Ω is connected to a 400 V, 50 Hz, 3-phase supply. Calculate the line currents. (5M+5M)
FirstRanker.com - Explain the working principle of 3-phase induction motor and derive the expression for torque. (10M)
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UNIT-V
- Explain the construction and working principle of Alternator. (10M)
- Explain the different types of DC generators with neat diagrams. (10M)
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