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D D7082

Total Pages: 3

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017

Course Code: BE101-03
Course Name: INTRODUCTION TO ELECTRICAL ENGINEERING

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 4 marks.
1 Differentiate between self-inductance and mutual inductance. What is meant by (4)
Coupling coefficient?
2 State and explain Kirchhoff's current and voltage laws with the help of neat diagram. (4)
3 Find the equivalent resistance Rap (4)

A
4 8५2
8

4 Compare electric and magnetic circuits in terms of any two similarities and two
differences.
5 Find equivalent impedance of the circuit shown in figure

“ 1
‏مہ‎ 2०० उ 120೧ 410൨

8 1

6 Draw the phasor diagram showing the following voltages ‏رلا‎ 100sin(500t), ५२८

200sin(500t+45°), ५७३८ -50cos(500t). Also find the expression of resultant voltage of
the three.

7 What is meant by resonance in electric circuit? Write the expression for resonance
frequency of a series RLC circuit.

8 With the help of an RLC circuit explain the concept of complex power and power
factor. ۱

9 Calculate the phase and line values of voltage and current in a 3-phase star connected
balanced network with phase impedance (6+j10) Q and supply voltage 100 ५, 50 Hz.

10 Derive the relation between phase values of current and voltage of a delta connected
3 phase circuit to the line values with the help of phasor diagram.

PART B

Answer any four full questions, each carries 10 marks.
1] a) State Faraday’s laws of electromagnetic induction and differentiate between statically
and dynamically induced emfs.

b) Two coils A and B 600 and 100 turns respectively are wound uniformly around a
wooden ring of mean circumference 80 cm. The cross-sectional area of the ring is
4cm?. Calculate self-inductance of each coil, mutual inductance between coils, emf
induced in the coil B when a current of 2A in coil A is reversed in 0.01 second.

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