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    Gujarat Technological University

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    smartboynitish01
    This document is an exam for a Basic Electrical Engineering course, consisting of 5 questions with 3 parts each. It covers topics like Ohm's Law, Kirchhoff's Laws, AC circuits, transformers, motors, batteries, cables, and power factor improvement. The exam has a total of 70 marks and is for BE semester 1 and 2 students at the Gujarat Technological University. It instructs students to attempt all questions and provide assumptions where necessary.

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    Gujarat Technological University

    Uploaded by

    smartboynitish01
    15 views2 pages
    This document is an exam for a Basic Electrical Engineering course, consisting of 5 questions with 3 parts each. It covers topics like Ohm's Law, Kirchhoff's Laws, AC circuits, transformers, motors, batteries, cables, and power factor improvement. The exam has a total of 70 marks and is for BE semester 1 and 2 students at the Gujarat Technological University. It instructs students to attempt all questions and provide assumptions where necessary.

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    Original Title

    3110005_W2019_11-1-2020[1]

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    This document is an exam for a Basic Electrical Engineering course, consisting of 5 questions with 3 parts each. It covers topics like Ohm's Law, Kirchhoff's Laws, AC circuits, transformers, motors, batteries, cables, and power factor improvement. The exam has a total of 70 marks and is for BE semester 1 and 2 students at the Gujarat Technological University. It instructs students to attempt all questions and provide assumptions where necessary.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    15 views2 pages

    Gujarat Technological University

    Uploaded by

    smartboynitish01
    This document is an exam for a Basic Electrical Engineering course, consisting of 5 questions with 3 parts each. It covers topics like Ohm's Law, Kirchhoff's Laws, AC circuits, transformers, motors, batteries, cables, and power factor improvement. The exam has a total of 70 marks and is for BE semester 1 and 2 students at the Gujarat Technological University. It instructs students to attempt all questions and provide assumptions where necessary.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    Seat No.: ________ Enrolment No.

    ___________

    GUJARAT TECHNOLOGICAL UNIVERSITY


    BE - SEMESTER– I & II (NEW) EXAMINATION – WINTER 2019
    Subject Code: 3110005 Date: 11/01/2020
    Subject Name: Basic Electrical Engineering
    Time: 10:30 AM TO 01:00 PM Total Marks: 70
    Instructions:
    1. Attempt all questions.
    2. Make suitable assumptions wherever necessary.
    3. Figures to the right indicate full marks.

    Marks
    Q.1 (a) State Ohm’s law and Kirchhoff’s Laws in context with DC circuits. 03
    (b) A 100V,60 Watt bulb is to be operated from a 220V supply. What is 04
    the resistance to be connected in series with the bulb to glow
    normally?
    (c) Derive an expression for equivalent resistances of a star connected 07
    network to transform into a Delta connected network.
    Q.2 (a) State Thevenin’s and Norton’s Theorems. 03
    (b) Compare series and parallel resonance in ac circuit. 04
    (c) A single phase R-L-C circuit having resistance of 8Ω, inductance of 07
    80mH and capacitance of 100µF is connected across single phase ac
    150 V , 50Hz supply. Calculate the current, power factor and voltage
    drop across inductance and capacitance.
    OR
    (c) Derive an expression for the voltage across the capacitor during 07
    charging through the resistor at any instant Vc = V(1-e-t/RC). Assume
    that RC series circuit is connected across a DC supply of voltage V.
    Q.3 (a) Define the following terms in connection with AC waveforms:- 03
    1. Q-Factor 2. Power Factor
    3.Form factor.
    (b) Draw impedance triangle, Voltage triangle, Power triangle for single 04
    phase R-L series circuit.
    (c) Derive the relationship between Phase and Line values of voltages 07
    and currents in case of 3-phase Star- connection.
    OR
    Q.3 (a) Define the terms:- 1. Real power 2. Reactive power 3. Apparent 03
    power.
    (b) Derive the EMF equation of single phase transformer. 04
    (c) With neat circuit diagram and a phasor diagram prove that two watt 07
    meters are sufficient to measure total power in 3-phase system.
    Q.4 (a) Explain working principle of single phase Transformer. 03
    (b) Give Merits, Demerits and Applications of Induction Motor. 04
    (c) Explain in detail the construction of an Alternator. 07
    OR
    Q.4 (a) Explain working principle of D.C. Motor. 03
    (b) Compare poly phase Induction Motor and single phase Induction 04
    Motor.

    1
    (c) Explain Generation of Rotating Magnetic Field in 3-phase Induction 07
    Motor with diagrams and equations.
    Q.5 (a) Classify different types of cables with reference to voltage and 03
    insulation materials.
    (b) Explain the terms:- 1. Residual magnetism 2. Coercive Force. 04
    (c) Explain the process of charging and discharging of Lead acid cell. 07
    OR
    Q.5 (a) Compare MCB and ELCB. 03
    (b) Write safety precautions for electrical Applications. 04
    (c) Explain different methods of power factor improvement. 07

    ***************

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