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BT-104 · Basic Electrical & Electronics Engineering/Unsolved PYQ Paper

BT-104 Basic Electrical & Electronics Engineering - Dec 2025 Question Paper

  1. 7 Marks
    aState the steps to solve the Thevenin's Theorem. An Electric iron is rated 1000W, 240V. Find the current drawn & resistance of the heating element.
  2. 7 Marks
    bFind the current through $3 \,\Omega$ resistor using superposition theorem in given figure.
  3. 7 Marks
    aExplain about Star and Delta connected three phase balanced circuits.
  4. 7 Marks
    bA series RLC circuit containing a resistance of $12 \Omega$, an inductance of $0.15 \text{H}$ and a capacitor of $100 \mu\text{F}$ are connected in series across a $100 \text{V}$, $50 \text{Hz}$ supply. Calculate the total circuit impedance, the circuits' current, power factor and draw the voltage phasor diagram.
  5. 7 Marks
    aDerive expression for the coefficient of: i) Self-inductance for a solenoid coil ii) Mutual inductance for a pair of closely wound solenoid coils
  6. 7 Marks
    bDiscuss some of the magnetization characteristics of ferromagnetic materials.
  7. 7 Marks
    aWith a neat circuit diagram and explain the construction and principle of operation of DC Motor.
  8. 7 Marks
    bA three phase $50 \text{Hz}$, 2 pole induction motor has a full speed of 2860 rpm. What is the (i) synchronous speed (ii) slip of the induction motor (iii) rotor emf frequency?
  9. 7 Marks
    aDefine $\alpha$ and $\beta$ with respect to BJT and derive the relationship between them. For a transistor circuit having $\alpha = 0.98$, $I_{CBO} = 5 \,\mu\text{A}$ and $I_B = 100 \,\mu\text{A}$, find $I_C$ and $I_E$.
  10. 7 Marks
    bDraw the circuit of an S-R flip flop using NAND gates. Explain it.
  11. 7 Marks
    aDetermine the equivalent resistance between terminals A and B in the given figure.
  12. 7 Marks
    bWhen three balanced impedances are connected in delta across a 3 phase 400 V, 50 Hz supply the line current drawn is 20 A at a lagging p.f. of 0.3. Determine the value of the impedance connected in each phase.
  13. 7 Marks
    aState and Prove Demorgan's theorem.
  14. 7 Marks
    bExplain about open circuit and short circuit test.
  15. 14 Marks
    Write technical short note on any **two** of the following: i) Voltage and current sources ii) Applications of DC machine iii) Half and Full adder circuits
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