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<h3>B.TECH (semester-1)</h3>
<h2>BASICS OF ELECTRICAL ENGINEERING<br>
SUBJECT CODE: BELED-101<BR>
Paper II: [110004]</h2>
<h4>Time:03 Hours</h4>
Instructions for candidates
<ol>
<li>Section A is Compulsory.</li>
<li>Attemp any four questions for Section B.</li>
<li>Attemp any two questions for Section C.</li>
<li>Any missing data may be assumed appropriately</li>
</ol>
<h3>Section - A</h3>
<div class="question">
<p>Q1</p>
<ol type="a">
<li>From fundamentals obtain expressions for power energy?</li>
<li>Define RMS value, average value and form factor</li>
<li>Indicate how the parameters in a series RLC circuit vary with frequency</li><br>
<li>Discuss the advantages of 5-phase sytem over single phase system</li><br>
<li>What are the different types of Induction motors?</li>
<li>State Lenz's law</li>
<li>What is form factor</li>
<li>Explain armature reaction in D.C. machine</li>
<li>State and explain krichhhoff's laws.</li>
<li>Plot and waveform of voltage and current for R-L series circuits</li>
</ol>
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<h3>Section - B</h3>
<div class="question">
<p>Q2. Write the relationship of star-delta transformation of three resistors.</p>
<p>Q3. Explain frequency,time period,Instentaneous value, maximum value and average value for a sinusoidal voltage</p>
<p>Q4. A single-phase transformer is required to step down and voltage from 1100 V to 400 V at 50 Hz The core has a cross-sectional area of 25 cm<sup>2</sup> and the maximum flux density is 5 Wb/m<sup>2</sup>. Determine the number of turns of the primary and secondary windings.</p>
<p>Q5. Three identical coins are connercted in star across a three-phase 415 V, 50 Hz supply. The total power drawn is 3 kW at a rower factor of 0.3. Calculate the resistance and indusctance of each coil.</p>
<p>Q6. Explain the principal of working of three-phase induction motor.</p>
</div>
<h3>Section - C </h3>
<div class="question">
<p>Q7. What do you understand by D.C. machines? What are the different types of D.C. machines? Discuss working principle of these machines. Explain the function of brush and commutator in a dc machine for generating action</p>
<p>Q8. Write short notes on the following: (i) Magnetzing reactance (ii) Leakage reactance (iii) Efficiency</p>
<p>Q9. Explain 3-phase EMF generation Derive relationship between phase and line for three phase star connections and delta connections.</p>
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