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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

B.Tech 51 (Special Improvement) Examination January 2021 (2019 scheme)

Course Code: EST 130

Course Name: BASICS OF ELECTRICAL AND ELECTRONICS ENGINEERING
(2019-Scheme)

PART I: BASIC ELECTRICAL ENGINEERING

Max. Marks:50 Duration: 90 min
PARTA
Answer all questions, each carries 4 marks.
1 Derive the expression for rms value of a sinusoidal wave form.
2 Define self inductance of a coil and derive an expression for the same.
3 Derive an expression for energy stored in a capacitor.
4 Prove that in a purely inductive circuit, current lags behind the applied

voltage by 90 degrees and the power consumed is zero.
5 With the help of circuit diagram and phasor diagram, derive the relation (5x4=20)
between line and phase voltage in a three phase star connected system.
PART ‏تا‎
‎Answer one full question from each module, each question carries 10 marks

Module-I
6 Find I, in the circuit using mesh current analysis. (10)

4-۸ 8 ‏وس‎ 2ka 29) 8५

OR
7 Find the source current I in the figure using star-delta transformation. (10)

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