Questions on Basic Electrical DC and AC Circuits

Assignment Questions: Basics of Electrical and Electronics Engineering

D.C. CIRCUITS AND A.C. CIRCUITS

• State Kirchoff’s voltage law, Kirchoff’s current law                                                      
• Write equations to transform electrical networks from star to delta and vice versa
• What is operating principle to generate alternating voltage?
• Draw & Describe the phase relation between current and voltage in RC & RL circuit?
• Find current through 4ohm resistor in Fig 1 by nodal analysis .

Figure of Numerical questions

•  What is relation between maximum voltage, RMS voltage and average voltage of sine wave?
• What do you mean by power factor and quality factor? Write their equations.
•  State and explain Superposition theorem in detail.
•  A coil having an inductance of 100 mH and resistance 20 Ω is connected in series with a 30 μF capacitor across a 300 V ac supply. Calculate (a) total current (b) voltage across resistance (c) voltage across inductor
•  Apply Norton’s theorem to calculate current in 5 Ω resistor in Fig 2.
• State and Explain Thevenin’s theorem in detail
•  What do you mean by Node and Mesh analysis.
• Define the terminologies:- a. Instantaneous values         b. Cycle          c. Periodic time         d. Angular velocity       e. Amplitude
•  Find the current through 8 Ohm resistor using loop analysis in Fig 3.
• By applying Kirchhoff’s current law , Solve and find V_CE and V_{GE in} Fig 4.
•  What do you mean by phase and phase difference of alternating current and voltages?
• Draw and describe working of series RL circuit connected across ac source with phasor diagram.
• Draw and describe working of series RC circuit connected across ac source with phasor diagram.
•  State and explain Superposition theorem.
• In the network shown in Figure 5, find the value of power dissipated across RL=5ohm.
•  Derive equations for average, RMS voltage, & Form Factor of sinusoidal waveform? 
•  Draw and describe working of RLC series circuit and write current equation.
•  Find Impedance of Pure Resistive, Inductive and Capacitive Circuit.
•  State and explain Ohm’s law.
• Using Thevenin’s theorem, calculate the current flowing through the 4 Ω resistor in Fig 6.
•  A choke coil having a resistance of 15Ω & an inductance of 63.7 mH is connected in series with a non-inductive resistor of 10Ω. The circuit has been connected across a 240V, 50 Hz mains. Calculate,
• a.      Current and Power factor    b. Voltage across the coil   c. Voltage across the non-inductive resistor
•  Find V1, V2, V3 and current flowing from A to D in Fig 7.
•  State Kirchoff’s voltage law, Kirchoff’s current law  
•  Describe AC through Pure Resistive, Inductive and Capacitive Circuit.
•  What is impedance triangle and power triangle.