Basic Electrical & Electronics Engineering (BT-104) - Important Questions

State and explain Kirchhoff's current law (KCL) and Kirchhoff's voltage law (KVL) with suitable example.

Using mesh analysis, determine the three mesh currents / branch current I0 in the DC network shown in figure.

Apply the superposition theorem to find the voltage V0 / current through 5-ohm resistor in the circuit shown in figure.

Define RMS value, average value, form factor, peak factor and related alternating quantity terms, and give their values for a sinusoidal waveform.

A choke coil having resistance 10 ohm and inductance 0.05 H is connected in series with a 100 micro-F capacitor across 200 V, 50 Hz supply. Find inductive reactance, capacitive reactance, impedance, current, power factor, power and voltages across elements.

For a 3-phase balanced supply feeding a delta-connected load with phase impedance (3.54+j3.54) ohm at 110 V, determine the line currents and draw the phasor diagram.

Explain Faraday's laws of electromagnetic induction.

What do you understand by self inductance and mutual inductance? Derive the relation between self inductance and mutual inductance.

Open circuit and short circuit test on a single phase transformer gave the following results: V0=200V, I0=0.7A, W0=20 Watt test from primary side; Vs=10V, Is=10A, Ws=40 Watt test from secondary side. Determine equivalent circuit parameters referred to primary.

Describe the construction and main parts of a D.C. machine with suitable sketches / schematic diagram.

Explain the principle of operation of a 3-phase induction motor.

A three phase 440 V, 50 Hz, 4-pole induction motor delivers rated output power at 1440 rpm. Find synchronous speed Ns=120f/P, slip s, rotor speed N=(1-s)Ns and rotor current frequency fr=s f.

Draw and explain the V-I characteristics of a PN junction diode.

Draw the circuit and explain the working principle and characteristics of transistor in common base configuration.

Write short notes on any two of the following: i) Logic gates ii) R-S flip flop iii) Compare electric and magnetic circuit iv) B-H curve