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- Electrical And Electronics Engineering - EEE
- 2018
- PYQ
**Biju Patnaik University of Technology BPUT - BPUT**- Electrical and Electronics Engineering
- B.Tech
**1347 Views**- 32 Offline Downloads
- Uploaded 11 months ago

i) j) A zener diode acts as a voltage regulator. Explain the meaning of the statement. What is the working principle of DC machines? Part – B (Answer any four questions) Q3 a) Find the current through 40 Ω resistor using superposition theorem for the circuit shown in figure 1. (5) Figure 1 Figure 2 Q4 b) State the maximum power transfer theorem and obtain the maximum power transferred to RL in the circuit shown in Figure 2. And also find the value of RL (10) a) Explain the principle of operation of a transformer in detail and Derive the Emf equation of single phase transformer. Draw the phase voltage and line voltage phasor diagram for 3-phase star connected balanced system. A 3-phase 230 V load has power factor of 0.7. Two wattmeter are connected to measure the power which shows the input to be 10 kW. Find the readings of each wattmeter. (5) b) Q5 Q6 a) b) a) b) Explain the operation of a full wave bridge rectifier with relevant waveforms. Explain the V-I characteristics of a P-N junction diode when it is connected in forward bias and reverse bias. A PN junction diode gives a current of 50 mA at a room temperature of 20 dergee C when the forward bias voltage is 200mV. Determine (a) the saturation current with a negative bias (b) the diode current when room temperature is 30 degree C , and (c) diode current at a forward bias voltage. Explain the full adder circuit with its expression and truth table. List out all the basic logic gates and universal gateswith its logic symbols and truth table. And generate AND function, OR function and NOT function using any one Universal gate. (10) (5) (10) (5) (10)

Q7 a) b) Q8 a) b) A series circuit has R= 5 Ω, L= 13 mH and C=140 µF and is supplied with 230 v, 50 Hz single phase. Find (i) Impedance (ii) current (iii) power (iv) power factor of the circuit. An iron ring made up of three parts, l1=12cm, a1=6 cm2, l2 =10 cm, a2=5 cm2, l3=8 cm and a3 = 4 cm2. It is surrounded by a coil of 200 turns. Determine the exciting current required to create a flux of 0.5 mwb in the iron ring .[ Given µ1=2670, µ2= 1055, µ3= 680] (8) Simplify the function Y = (A+B)(A +C)(B+C) and design the circuit for simplified function using basic logic gates. Determine (i) IC(sat) (ii) IC (iii) VC(iv)VE and (v)VCE for the circuit shown in figure 3 . (8) (7) (7) Figure 3 Q9 a) b) c) d) e) Write a short note on any THREE : Magnetic material and B-H curve Different methods of transistor biasing. Generation and distribution of AC Power Transients in RL circuit with DC excitation circuit elements and their characteristics (5 x 3)

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