GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- I & II (OLD) EXAMINATION — WINTER 2019
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Subject Code: 110005 Date: 11/01/2020
Subject Name: Elements Of Electrical Engineering
Time: 10:30 AM TO 01:00 PM
Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Define the following terms with respect to AC waveforms: [07]
- Angular velocity
- Form factor
- Crest Factor
- Instantaneous Value
- RMS Value
- Phase angle
- Frequency
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(b) Compare electric circuit and magnetic circuit by their similarities and dissimilarities. [07]
Q.2 (a) Define the following terms with reference to Electrostatics & Electromagnetic: [07]
- Electric potential
- Electric flux density
- Permittivity
- Electric field intensity
- MMF
- Magnetic flux density
- Reluctance
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(b) A 100V, 100 W lamp is connected in series with 100 V, 60 W lamp across 200 V supply. Determine current drawn and power consumed by each lamp. [07]
Q.3 (a) Explain resonance in series R-L-C circuit with graphical representation and resonance curve. [07]
(b) Explain the method of transforming a star network into a delta network. [07]
Q.4 (a) Explain two wattmeter method for power measurement in 3-phase delta connected load. [07]
(b) Derive an expression for the energy stored in an inductor of self inductance ‘L’ henrys carrying the current of ‘I” amperes: [07]
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Q.5 (a) A circuit consists of a pure inductor, a pure resistor and a capacitor connected in series. When the circuit is supplied with 100 V, 50 Hz supply, the voltage across inductor and resistor are 240 V and 90 V respectively. If the circuit takes 10 A leading current, calculate (i) value of inductance, resistance and capacitance (i) power factor of the circuit (iii) voltage across capacitor. [07]
(b) Derive expressions of ‘voltage and current for capacitor of C farads during charging process. [07]
Q.6 (a) Explain the construction of a cable with functions of its various parts with the help of neat diagram. [07]
(b) Explain charging and discharging of Lead acid battery. [07]
Q.7 (a) What is importance of earthing ? Explain plate earthing with diagram. [07]
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(b) Explain the types of lighting schemes with suitable diagrams. [07]
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