# Questions on Basic Electrical DC and AC Circuits

Saturday, November 21, 2020

**Edit****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 .

- 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.