STUDY MATERIAL📚✏

*# BT-104 — Basic Electrical & Electronics Engineering* *Top 15 Most Expected Questions* UNIT I — D.C. CIRCUITS 1. State and explain Kirchhoff's Current Law (KCL) and Kirchhoff's Voltage Law (KVL). Apply Kirchhoff's laws to determine the currents in the given electrical network. 2. State and explain the Superposition Theorem. Determine the current through a specified branch of a DC network using the Superposition Theorem. 3. State and explain Thevenin's Theorem. Determine the current through the given load resistance by replacing the network by its Thevenin equivalent circuit. 4. Derive the relations for Star-to-Delta and Delta-to-Star transformation and explain their application in electrical circuits. UNIT II — A.C. CIRCUITS 5. Define average value, RMS value, form factor and peak factor of an alternating quantity. Derive the expression for the RMS value of a sinusoidal alternating current. 6. A series R-L-C circuit is connected to a single-phase AC supply. Determine its impedance, current, power factor, active power, reactive power and apparent power. 7. Explain the generation of a sinusoidal alternating voltage. Represent an alternating quantity by a phasor and explain the concept of power factor. 8. Explain a balanced three-phase system. Derive the relationship between line and phase voltages and currents for Star and Delta connected loads. UNIT III — MAGNETIC CIRCUITS & TRANSFORMER 9. Explain the construction and working principle of a single-phase transformer. Derive the EMF equation of a transformer and explain the transformation ratio. 10. Explain the Open Circuit and Short Circuit tests of a single-phase transformer. Determine the equivalent circuit parameters and losses from these tests. 11. Explain the losses and efficiency of a transformer. Derive the condition for maximum efficiency and solve a numerical based on transformer efficiency. UNIT IV — ELECTRICAL MACHINES 12. Explain the construction and working principle of a DC machine. Derive the EMF equation of a DC generator and explain its applications. 13. Explain the construction and working principle of a three-phase induction motor. Define slip and derive the expression for slip. Explain the torque-slip characteristics. UNIT V — BASIC ELECTRONICS 14. Explain the construction and working of a P-N junction diode. Draw and explain its V-I characteristics. Also explain the concept of knee voltage and reverse breakdown voltage. 15. Explain the working of a BJT in CB, CE and CC configurations. Compare the three configurations with respect to current gain, voltage gain, input resistance, output resistance and applications.