Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech II ELECTRICAL ENGINEERING Previous Question Paper (August/September - 2022 - R16)
Answer any five questions. All questions carry equal marks.
Main
Find the current flowing through each resistance in the below circuit.
Answer
To find the current through each resistance in a circuit, one must first identify the circuit configuration. If the resistances are in series, the same current flows through each, calculated as I = V/R_total. If the resistances are in parallel, the voltage across each is the same, and the current through each branch is calculated using Ohm's Law, I_n = V/R_n. Without the provided circuit diagram, the general procedure is to apply Kirchhoff's Laws: use Kirchhoff's Current Law (KCL) at nodes to sum currents to zero and Kirchhoff's Voltage Law (KVL) around loops to sum voltages to zero. Solving the resulting system of linear equations yields the current through each individual resistor.
Three resistors 40 Ω, 60 Ω, 100 Ω are connected in series and is supplied by 200V, then find the voltages across each resistor.
Answer
For resistors in series, the total resistance R_total is the sum of individual resistances:
The total current I flowing through the circuit is:
Using Ohm's Law (V = I × R), the voltage across each resistor is:
- Voltage across 40 Ω: V1 = 1 A × 40 Ω = 40 V
- Voltage across 60 Ω: V2 = 1 A × 60 Ω = 60 V
- Voltage across 100 Ω: V3 = 1 A × 100 Ω = 100 V
Give brief about the following:
Electromagnetic induction
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Faraday’s law
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Lenz’s law
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Ohm’s law.
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Obtain an expression for current of a series R-C circuit when it is supplied by single phase AC supply.
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A coil of resistance 10Ω and inductance 100mH in series with a 100μF capacitor, is connected to a 230V, 50 Hz supply. Calculate current flowing through the circuit.
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A resistor of 25Ω is connected in series with a capacitor of 45μF. Calculate (i) the impedance, and (ii) the current taken from a 230V, 50 Hz supply.
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Obtain an expression for resonant frequency of a series RLC circuit excited by compare voltage of variable frequency.
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Explain the principle and operation of D.C generator with neat sketch.
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Define back EMF and Derive the torque equation of DC motor.
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Explain different types of speed control of d.c. motor.
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Find the efficiency and regulation of single-phase transformer by conducting OC and SC test.
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A 3-phase, 50Hz induction motor has a full-load speed of 1450 r.p.m. and slip of 4%, find the number of poles?
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Explain the construction detail, principle and working of an alternator.
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