BEE Basic Electrical 2 — Questions and Answers
Question 1: A resistor of 10 Ω is connected in parallel with another resistor of 40 Ω. What is the equivalent resistance?
- 8 Ω (Correct answer)
- 50 Ω
- 25 Ω
- 4 Ω
Correct answer: 8 Ω
For parallel resistors: 1/R = 1/10 + 1/40 = 5/40, so R = 8 Ω.
Question 2: Which of the following best describes the behavior of an inductor in a DC steady-state circuit?
- It acts as an open circuit
- It acts as a short circuit (Correct answer)
- It acts as a capacitor
- It blocks AC but passes DC with high impedance
Correct answer: It acts as a short circuit
In DC steady state, the inductor has no changing current, so its voltage drop is zero — it acts as a short circuit (wire).
Question 3: If the voltage across a 5 Ω resistor is 20 V, what is the power dissipated?
- 80 W (Correct answer)
- 100 W
- 4 W
- 25 W
Correct answer: 80 W
P = V²/R = 400/5 = 80 W.
Question 4: Kirchhoff's Current Law (KCL) is based on which conservation principle?
- Conservation of charge (Correct answer)
- Conservation of energy
- Conservation of flux
- Conservation of momentum
Correct answer: Conservation of charge
KCL states that the algebraic sum of currents at a node is zero, which follows from conservation of electric charge.
Question 5: A 100 μF capacitor is charged to 50 V. How much energy is stored?
- 0.125 J (Correct answer)
- 0.25 J
- 250 J
- 0.025 J
Correct answer: 0.125 J
E = ½CV² = ½ × 100×10⁻⁶ × 2500 = 0.125 J.
Question 6: What happens to the total resistance of a series circuit when one more resistor is added?
- It increases (Correct answer)
- It decreases
- It stays the same
- It becomes zero
Correct answer: It increases
Series resistances add directly, so adding any positive resistance always increases total resistance.
Question 7: Which law relates the magnetic field around a conductor to the current flowing through it?
- Ampere's Law (Correct answer)
- Faraday's Law
- Gauss's Law
- Lenz's Law
Correct answer: Ampere's Law
Ampere's Law states that the line integral of magnetic field around a closed path equals the enclosed current times μ₀.
BEE Basic Electrical 2
A resistor of 10 Ω is connected in parallel with another resistor of 40 Ω.
What is the equivalent resistance?