Elements of Electrical Engineering — Winter 2019

Define the following terms with respect to AC waveforms: (1) Angular velocity (2) Form factor (3) Crest Factor (4) Instantaneous Value (5) RMS Value (6) Phase angle (7) Frequency

Compare electric circuit and magnetic circuit by their similarities and dissimilarities.

Define the following terms with reference to Electrostatics & Electromagnetic: (1) Electric potential (2) Electric flux density (3) Permittivity (4) Electric field intensity (5) MMF (6) Magnetic flux density (7) Reluctance

A 100 V, 100 Wlamp is connected in series with 100 V, 60 Wlamp across 200 Vsupply. Determine current drown and power consumed by each lamp.

Explain resonance in series R-L-Ccircuit with graphical representation and resonance curve.

Explain the method of transforming a star network into a delta network.

Derive an expression for the energy stored in an inductor of self inductance ‘L’ henrys carrying the current of ‘I’ amperes.

Explain two wattmeter method for power measurement in 3-phase delta connected load.

Acircuit 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 Vand 90 Vrespectively. If the circuit takes 10 Aleading current, calculate (i) value of inductance, resistance and capacitance (ii) power factor of the circuit (iii) voltage across capacitor.

Derive expressions of voltage and current for capacitor of Cfarads during charging process.

Explain the construction of a cable with functions of its various parts with the help of neat diagram.

Explain charging and discharging of Lead acid battery.

What is importance of earthing ? Explain plate earthing with diagram.

Explain the types of lighting schemes with suitable diagrams.