10120
Reg. No.: N arnec
AP.r ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTii{ B. TECH DEGREE SPECIAL EXAMINATION. SEPTEMBER 2016
BE 101-03 INTRODUCTION TO ELECTRICAL ENGINEERING
Max. Marks: 100 Lkrration: 3 Hours hrsfructions: Make suiiubte assumptions Ifany
data is missing
Write units in an numerical
answers
PART— A (Answer all Questions, 1054 40 marks)
1 Determine the current supplied by the battery in the circuit shown in fig. using star
delta transformation (4)
2 Draw and explain the characteristics Of ideal and practical voltage and current
sources,
3 Distinguish between self inductance and mutual inductance and derive the
expression for the self inductance Of a coil.
4 A Capacitor and resistor are connected in series across 1 20 V, SO supply-

he circuit dmws a current or 1.144 A, If power loss in the circuit is 130.8 W, find

the values of resistance and capacitance, (4)
5 For an ac circuit; if v(t) 160 sin (cot4- 10°) and i(t) Ssin(ot - 20 °); find

the power factor and active power absorbed by the circuit. Draw the phascr

diagram. (4)
6 What is resonant frequency? A series LC circuit is resonate at 1 50 kHz and

has a Q of 50, Find the upper and lower cutoff frequencies. (4)

7 What are the advantages of three phase system over single phase system? (4)