BT-104 (GS) – Basic Electrical and Electronics Engineering

B.Tech. I & II Semester
Examination, June 2024
Grading System (GS)
Max Marks: 70 | Time: 3 Hours

Note:
i) Attempt any five questions.
ii) All questions carry equal marks.

Previous Year Questions (June 2024)

Q.1

a) Discuss about ideal voltage source and ideal current source with neat diagram. How ideal voltage source can be converted into ideal current source. (Unit 1)

b) State and explain the superposition theorem with suitable example. (Unit 1)
Q.2

a) Using the mesh analysis, find the current through 5$\Omega$ resistor in the network as shown in figure below. (Unit 1)

A circuit diagram for mesh analysis. A 100V AC source is connected to a central T-junction. The top part of the T has a 20-ohm resistor, and the bottom has a 5-ohm resistor. A horizontal branch containing a 4A current source and a 3-ohm resistor connects the T-junction to a right-hand branch with a 2-ohm and a 1-ohm resistor in series. The goal is to find the current through the 5-ohm resistor.

b) Define the following: (Unit 2)

i) Average value of AC voltage

ii) RMS value of AC voltage

iii) Power factor

iv) Active power

v) Reactive power

vi) Apparent power

vii) Three phase balanced supply
Q.3

a) Draw Phasor diagram of a 3-phase delta connected load and find the relation between phase line voltage and currents. (Unit 2)

b) A 220 volt, 50 Hz supply is given to a series R, L, C circuit having a resistance of 50$\Omega$, Inductance of 0.2H and capacitance of 100 µF. Calculate impedance, Current in the circuit and Voltage across R, L, C. (Unit 2)
Q.4

a) Discuss about magnetization characteristics of ferromagnetic material. (Unit 3)

b) Draw the complete phasor diagram of a single phase transformer for an inductive load. Also write the notations used for all voltages and currents used in the phasor diagram. (Unit 3)
Q.5

a) What do you understand by self inductance and mutual inductance. Derive the relation between self inductance and mutual inductance. (Unit 3)

b) Explain the construction and working principle of a DC machine with the help of neat diagram. (Unit 4)
Q.6

a) Discuss about the Torque - slip characteristics of 3-Phase Induction Motor. (Unit 4)

b) A 6 pole alternator running at 1200 rpm supplies a three phase induction motor wounded for 4 poles. If the rotor induced emf makes 3 alternator per second. Find the actual rotor speed. (Unit 4)
Q.7

a) What do you understand by semiconductor. Explain the different types of semiconductors in details. (Unit 5)

b) What is the need of full adder circuit? Design a Full adder circuit with truth table and logic diagram. (Unit 5)
Q.8

Write a short note on any two:

a) Star Delta Transformation (Unit 1)

b) J-K Flip-Flop (Unit 5)

c) Laws of Electromagnetic Induction (Unit 3)

d) Power in balanced and Unbalanced Three Phase System (Unit 2)