JNTU
JNTU B.Tech I Year BASIC ELECTRICAL ENGINEERING Previous Question Paper (March/April - 2023 - R18)
Answer all questions in Part A. Answer any one question from each unit in Part B.
Part A
State Norton’s Theorem.
Answer
Norton's Theorem states that any linear, bilateral, active network consisting of independent or dependent voltage and current sources and resistors can be replaced by an equivalent circuit consisting of a single current source (Norton current, IN) in parallel with a single resistor (Norton resistance, RN) connected across the same two terminals.
Write short notes on voltage source and current source.
Answer
A voltage source is a two-terminal device that maintains a constant voltage across its terminals regardless of the current drawn from it. An ideal voltage source has zero internal resistance.
A current source is a two-terminal device that delivers a constant current to the external circuit regardless of the voltage across its terminals. An ideal current source has infinite internal resistance.
Define power factor. What is the ideal value of power factor?
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What is balanced system and unbalanced system?
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Write the applications of an auto transformer.
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What is meant by ideal transformer? What are the properties of ideal transformer?
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Write the applications of single-phase induction motor?
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A 3 phase 4 pole, 50 Hz induction motor is running at 1455 rpm. Find the slip speed and slip.
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What is the component used in L.T switch gear.
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Define earthing, explain its importance?
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Part B
Using Thevenin’s theorem, calculate Thevenin’s Resistance, Thevenin’s voltage across 5 ohms resistor (figure 1).
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Find the current ‘i’ in the circuit below figure 2.
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State and explain Superposition Theorem.
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Define time constant. Explain the time domain analysis of first order Series RL circuit.
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Find the impedance of series R-L-C circuit with R=50Ω, XL=25Ω and XC=10Ω.
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Derive the average value, peak value, form factor for a sine waveform.
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Derive an expression for average power in a single-phase circuit contains L element across sinusoidal voltage.
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Give the relationship between phase voltage and line Voltage, phase current and line current for balanced three phase delta connected system.
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What are the various connections of three phase transformer?
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Define voltage regulation, what is the meaning of zero regulation in transformer?
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Explain types of losses that takes place in a transformer.
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Draw and explain the equivalent circuit of a transformer.
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Explain the constructional details of three phase induction motor.
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Draw torque slip characteristics of three phase induction motor.
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Explain the constructional details of synchronous generator.
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What are different methods to control speed of induction motor?
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Explain the types of batteries and its important characteristics.
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Mention the importance of power factor improvement.
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Write a short notes on battery back-up.
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Explain how an MCB Works.
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