JNTU
JNTU B.Tech II ELECTRICAL ENGINEERING Previous Question Paper (September - 2021 - R13)
Answer any five questions. All questions carry equal marks.
Main
State and explain Kirchhoff’s laws.
Answer
Kirchhoff’s Current Law (KCL) states that the algebraic sum of currents entering a node (or junction) is zero. Mathematically, ΣI = 0. This is based on the principle of conservation of charge, implying that the total current entering a junction must equal the total current leaving it.
Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of all voltages around any closed loop in a circuit is zero. Mathematically, ΣV = 0. This is based on the principle of conservation of energy, meaning the sum of voltage drops across components in a loop equals the sum of the source voltages.
Obtain the total power supplied by the 60-V source and the power absorbed in each resistor in the network of Figure.
Answer
To determine the power, first calculate the equivalent resistance of the network. Assuming a standard series-parallel configuration where the 60-V source is connected to resistors R1, R2, and R3, calculate the total resistance R_eq. The total current supplied by the source is found using I = V / R_eq.
The power supplied by the source is calculated using the formula:
The power absorbed by each individual resistor is calculated using the formula:
where I_r is the current flowing through the specific resistor. By applying Ohm’s law and the voltage divider rule to find branch currents, the power absorbed by each resistor is determined. The sum of power absorbed by all resistors must equal the total power supplied by the 60-V source, confirming the principle of conservation of energy.
Explain the constructional details of an attraction type M.I. instrument with the help of a neat diagram.
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State the advantages and disadvantages of PMMC instrument.
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Derive an expression for power in a single phase R-L circuit excited by an alternating voltage source.
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An alternating voltage (100 + j60) volt is applied to a circuit and current flowing is (6 - j20) amps. Find the (i) impedance of the circuit and (ii) power factor and power of the circuit.
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Explain the properties of series resonance RLC circuit.
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State the relation between line and phase quantities of 3-phase delta connected balanced system.
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State the principle of operation of D.C. Generator and derive the expression for the emf generated.
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Describe the procedure of conducting Swinburne’s test with the help of a neat diagram to find out the efficiency of a D.C. Machine.
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What are the constructional features of both squirrel cage induction motor and slip ring induction motor? Discuss the merits of one over the other.
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A 3 phase, 50 Hz induction motor has a full load speed of 960 rpm. Calculate (i) number of the poles (ii) slip frequency.
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Explain the synchronous impedance method of determining regulation of an alternator? State the assumptions made in the synchronous impedance method?
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