BEE semester examination winter 2019 (vgec)
BE - 1st SEMESTER EXAMINATION - WINTER 2019
Subject Code: 3110005 Date: 21/10/2019
Subject Name: Basic Electrical Engineering Time: 1 - hour Total Marks: 15.
Q. 1 (a) A 100V, 100W lamp is connected in series with a 100V, 60W lamp across 200V supply Determine current drawn and power consumed by each lamp.[02]
Q. 1 (b) Define: i) Resistivity ii) Conductanc iii) Mesh[03]
Q. 2 (a) Define: i) Form factor ii) RMS Value iii) Reactive power.[03]
Q. 2 (b) A single phase RL series circuit is connected with 200V, 50 Hz ac supply, the value of resistor and inductive reactance is 10 Ω and 5 Ω respectively. Find the power factor of the circuit.[02]
OR
Q. 2 Derive an expression for avarage power for single phase AC series RL circuit with circuit diagram and phasor diagram. [05]
OR
Q. 3 (a) Define power factor and explain for low power factor.[03]Q. 3 (b)Calculate electric energy consumed by an electric iron rated 230 V, 2KW when used for 12 hours. [02]
syllabus topics:
DC Circuits:(CO1)Electrical circuit elements (R, L and C), voltage and current sources, Kirchoff’s current and voltage laws, analysis of simple circuits with dc excitation.
2
AC Circuits:(CO2)
Representation of sinusoidal waveforms, peak and RMS values, Phasor representation of AC quantities, real power, reactive power, apparent power, power factor.
Analysis of single-phase ac circuits consisting of R, L, C, RL, RC, RLC combinations (series)
3
Electrical Installations:(CO4)
Safety precautions for electrical appliances.
Elementary calculations for energy consumption.
Basics of power factor improvement.