Reg 20: ‏ل‎ 0000EST130121962°
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

First Semester B.Tech Degree Regular and Supplementary Examination December 2020 (2019 Scheme)

Course Code: EST 130
Course Name: BASICS OF ELECTRICAL AND ELECTRONICS ENGINEERING
PART I: BASIC ELECTRICAL ENGINEERING

(2019 Scheme)
Max. Marks: 50 Duration: 90 min
PARTA
Answer all questions, each carries 4 marks.
1 What are statically and dynamically induced emfs? Explain.
2 Derive the expression for average value of a sinusoidal wave form.
3 Derive an expression for the energy stored in an inductor.
4 Prove that in a purely capacitive circuit the current leads the applied voltage by 90

degrees and the power consumed is zero.
5 Derive the relation between line and phase currents in a3 phase delta connected
system. (5x4=20)
PART 8
Answer one full question from each module, each question carries 10 marks

Module-I
6 Find the source current I in the below figure using star-delta transformation. (10)

(ஆ 22

20 ४

OR
7 Use the nodal analysis to find voltages Va, ४७ , Ve , Vd. (10)

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