BEE FREE Bachelor of Electrical Engineering Basic Electrical Questions and Answers 2 — Questions and Answers
Question 1: What is the SI unit of electrical capacitance?
- Farad (Correct answer)
- Henry
- Ohm
- Coulomb
Correct answer: Farad
The farad (F) is the SI unit of electrical capacitance, named after Michael Faraday.
Question 2: In a purely resistive AC circuit, what is the phase angle between voltage and current?
- 0 degrees (Correct answer)
- 45 degrees
- 90 degrees
- 180 degrees
Correct answer: 0 degrees
In a purely resistive circuit, voltage and current are in phase, meaning the phase angle is zero degrees.
Question 3: Which theorem states that any linear bilateral network can be replaced by an equivalent voltage source in series with an impedance?
- Thevenin's theorem (Correct answer)
- Norton's theorem
- Superposition theorem
- Maximum power transfer theorem
Correct answer: Thevenin's theorem
Thevenin's theorem simplifies a complex linear circuit to a single voltage source and series impedance.
Question 4: What happens to the total resistance when resistors are connected in parallel?
- It decreases below the smallest individual resistance (Correct answer)
- It equals the sum of all resistances
- It equals the largest resistance
- It remains unchanged
Correct answer: It decreases below the smallest individual resistance
Parallel resistors always yield a total resistance smaller than the smallest individual resistor in the combination.
Question 5: What is the time constant of an RC circuit with R = 10 kohm and C = 100 microfarads?
- 1 second (Correct answer)
- 0.1 second
- 10 seconds
- 0.01 second
Correct answer: 1 second
The time constant tau equals R times C, so 10,000 ohms multiplied by 0.0001 farads equals 1 second.
Question 6: Which material is most commonly used as a conductor in residential electrical wiring in the United States?
- Copper (Correct answer)
- Aluminum
- Silver
- Gold
Correct answer: Copper
Copper is the standard conductor for US residential wiring due to its excellent conductivity, ductility, and cost-effectiveness.
BEE FREE Bachelor of Electrical Engineering Basic Electrical Questions and Answers 2
What is the SI unit of electrical capacitance?