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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIV.
B.Tech degree examinations (S), September 2020 (S1/S2 - 2015 Scheme)
Course Code: BE101-03
Course Name: INTRODUCTION TO ELECTRICAL ENGINEERING
Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 4 marks. Marks

‎1 A conductor of length 0.4 m situated at right angles to a uniform magnetic field (4)
of flux density 1Wb/m? moves with a velocity of 70m/s. Calculate the emf
induced if the conductor moves at an angle 30° to the field.

‎2 State and explain Kirchhoff’s voltage and current laws. These laws express the (4)
conservation of two important physical quantities. Name them.

‎3 Derive the expression for energy stored in an inductor. (4)

‎4 A coil of 200 turns is wound on a wooden ring of radius 7.95 mm and cross- (4)
sectional area of 200 നന്‌. Obtain flux density in the core and total flux, when a

‎current of 10A is flowing through the coil.

‎5 Prove that the power consumed by a purely inductive ac circuit is zero. (4)

‎6 Find the RMS value of a full wave rectified sinusoidal current. (4)

‎7 What is meant by power factor of an ac circuit? What are its minimum காம்‌ (4)
maximum values?

‎8 An impedance of (3+j4) Q is connected across a 100V single phase ac supply. (4)
Find the current, active power, reactive power and power factor.

‎9 A balanced delta connected load consists of three 204405 62 impedances (4)
connected to a three phase 400V, 50Hz supply. Find the line current, power
factor and total power consumed.

‎10 List the advantages of three phase systems over single phase systems. (4)

‎PART B
Answer any four full questions, each carries 10 marks.
11 a) Derive an expression for the energy stored in an inductor. (4)
b) Coil A and B in a magnetic circuit have 750 and 600 turns respectively. A (6)

‎current of 10 A in coil A produces a flux of 0.02 Wb in it. If the coefficient of

‎coupling is 0.2, calculate

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