JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I BASIC ELECTRICAL ENGINEERING Previous Question Paper (January/February - 2024 - R22)
Note: Part-A is compulsory. Part-B consists of ten questions (2 to 11) where student should answer five questions, selecting one from each unit.
Part A
Three capacitors of 4 μF, 4 μF and 8 μF are connected in parallel. What is its equivalent capacitance?
Answer
JNTU
BASIC ELECTRICAL ENGINEERING
B.Tech | CSE | R22 | I-I | Dec 2023 | 1 Mark | 2 Minutes
Answer the following question:
To calculate the equivalent capacitance of capacitors connected in parallel, we use the formula:
- The equivalent capacitance (Ceq) for capacitors connected in parallel is the algebraic sum of individual capacitances:
Ceq = C1 + C2 + C3 + ... + Cn - Given values: C1 = 4 μF, C2 = 4 μF, C3 = 8 μF.
- Calculation:
Ceq = 4 μF + 4 μF + 8 μF = 16 μF - Note: Capacitors in parallel experience the same voltage across them, allowing their charges to add up linearly.
The equivalent capacitance is 16 μF.
How Thevenin’s voltage source and Thevenin’s resistance are connected?
Answer
JNTU
BASIC ELECTRICAL ENGINEERING
B.Tech | CSE | R22 | I-I | Dec-2023 | 1 Mark | 1 Minute
According to Thevenin’s Theorem, any linear, bilateral active network consisting of independent/dependent sources and resistors can be replaced by an equivalent circuit consisting of a single voltage source in series with a resistor. The connectivity is defined as follows:
- The Thevenin’s equivalent voltage (Vth), which represents the open-circuit voltage across the specified terminals, is connected in series with the Thevenin’s equivalent resistance (Rth).
- This combination is then connected in series with the load resistance (RL) to facilitate circuit analysis.
- The Rth is calculated by turning off all independent sources (short-circuiting voltage sources and open-circuiting current sources) and finding the equivalent resistance seen from the output terminals.
Define the peak factor.
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What is the current and voltage relationship in a pure inductor?
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What is the main purpose of using core in a transformer?
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What is an autotransformer?
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What is the basis for classification of D.C. Generators?
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What is the equation of synchronous speed in a three-phase induction motor?
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What is the primary objective of providing the circuit breaker in power system?
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What are the types of circuit breakers are available in the market for low voltage applications?
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Part B
Answer the following:
State and explain KVL and KCL.
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Three resistors R1, R2 and R3 are connected in series across a constant voltage V. Voltage across R1 is 20V. Power consumed by R2 is 25W and R3 = 2 ohms. Find the voltage if the current is 5A.
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Answer the following:
State and explain the superposition theorem.
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A 500 μF capacitor is charged to 20 V DC. It is suddenly connected to a resistance of 500 kΩ. Find (i) voltage across capacitor at t =0, (ii) current through capacitor at any time and (iii) voltage across capacitor at t = ∞.
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Answer the following:
Define i) Instantaneous value, ii) Time period, iii) Frequency, iv) Cycle and v) Amplitude.
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A sinusoidal voltage v = 50 Sin ωt is applied to a series RL circuit. The current in the Circuit is given by i = 25 Sin (ωt-53°). Determine (i) apparent power, (ii) Average power and (iii) power factor.
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Answer the following:
Derive the relation between line and phase quantities of voltages and currents for a delta connected system.
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A coil has a resistance of 20 ohms and inductance of 80 mH and is connected in series with a 100 pF capacitor. Determine the circuit impedance at resonance and also find the resonant frequency?
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Answer the following:
Explain different losses in a single-phase transformer.
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A 220/110V, 50Hz, 1.5kVA, has primary and secondary winding resistance of 1Ω and 2Ω, and reactance of 3Ω and 5Ω respectively find the total equivalent resistance, equivalent reactance and equivalent impedance referred by primary and secondary.
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Answer the following:
Explain the operation of auto transformer.
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Describe the three-phase transformer connections.
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Answer the following:
Explain the performance characteristics of dc shunt machine.
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Discuss the construction and working of a three-phase induction motor.
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Answer the following:
Explain why single phase induction motor is not self-starting.
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Describe the working principle of synchronous generator.
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Answer the following:
Discuss the high rupturing capacity fuse with neat diagram. List out its merits and demerits.
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Explain the ELCB and MCCB protection used in L.T switch gear.
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Answer the following:
What are the criterion considered for classified the wires and cables.
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Describe the Nickel cadmium batteries. List out its merits and demerits.
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