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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION, JUNE 2016

BE101-03 INTRODUCTION TO ELECTRICAL ENGINEERING

Max. Marks: 100 Duration: 3 Hours
Instructions: Make suitable assumptions ifany data is missing Write units in all numerical
answers
PART- A

(Answer all Questions. 10×4 40 marks)
Identify and explain the source given in the figure below within the dotted line. (4)

Given V=I.5V and R=IQ, find the value of current 10 and voltage Vo across RL
ues OF Ky = ४.1, 0.2 and 1

(------------------¬

for the following values of RL 0.1, 0.5 ۸541.0 0.
List a few similarities and dissimilarities of magnetic and electric circuits. (4)
A 50 cm long conductor moves with a velocity of 2 m/s at right angles to itself and (4)

a uniform magnetic field of [Wb/m? flux density. Calculate the voltage induced
between the ends of the conductor. What will be the voltage if the conductor is
moving at 30° from the direction of the flux?

A capacitor of capacitance 79.5 PF is connected in series with a non-inductive (4)
resistance of 30 Q across 100 V, 50 Hz supply. Find (i) impedance (11) current (111)
phase angle and (iv) equation for instantaneous value of current.

The voltage across 150 Q resistor is 150 sin(2zx10*t) ५. At what value of '! ' does (4)

the current through the resistor equal to -0.26 A and what is instantaneous power at
this time t ?

What is resonant frequency? Give a graphical explanation of series resonance in (4)
series RLC circuits.

What are the advantages of three phase system over single phase system? (4)
How do you measure 3phase reactive power in a balanced 3 phase system using ௫
one Wattmeter?

What is the role of a MCB in domestic wiring circuit? Also explain the working (4)

ofMCB

Explain the necessity of earthing in electrical appliances (4)