D A192008 Pages: 3

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019
Course Code: BE101-03
Course Name: INTRODUCTION TO ELECTRICAL ENGINEERING

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries4 marks. Marks
1 State Faradays laws of electromagnetic induction. (4)
2 Three resistors, 20 6, 90Q and 10 Q are connected in star. Obtain the equivalent (4)
delta circuit.
3 Distinguish between statically and dynamically induced emfs. List few electric (4)

equipments working on these principles.
4 Define mmf and reluctance. (4)

A series connected load draws a current i(t)}= 4 cos (1007 t +10 ) A when applied (4)
across v(t) =120 cos (100zt -20 ) ५. Find the value of load impedance and circuit
power factor.

6 Find the form factor of a sinusoidal wave. (4)

7 What are active and reactive powers? Draw the power triangle. (4)

8 Define resonance in a series RLC circuit and derive the expression for resonant (4)
frequency.

9 Three identical resistors connected in delta is supplied from a three phase 400V, (4)

50Hz supply and draws a line current of 4 A.Calculate the value of the resistors
and power consumed in the resistors.
10 Derive the relationship between phase current and line current in a 3-phase 1९18 (4)

connected system.
PART ‏تا‎
‎Answer any fourfull questions, each carries10 marks.
11 a) Why inductors and capacitors are called energy storage devices? (4)
b) An iron cored reactor is wound with 250 turns and has an air gap of 0.8 cm. The (6)
flux path in iron is 1.2 m and the cross sectional area is 0.15 ന്‌. Determine the
inductance of the reactor when carrying a current of 10 A. Take relative
permeability of iron as 1100.

12 Evaluate the power delivered by the 2V source in the circuit below using supermesh (10)
analysis.

Page 1 of 3