BEE Electric Circuits 2

Question 1

A 10 Ω resistor and a 40 Ω resistor are connected in parallel. What is the equivalent resistance?

Accepted Answer

8 Ω

Answer

Parallel resistance: 1/Req = 1/10 + 1/40 = 5/40, so Req = 8 Ω.

Question 2

Which of the following best describes a node in circuit analysis?

Accepted Answer

A point where two or more circuit elements meet

Answer

A node is any point in a circuit where two or more elements are connected together.

Question 3

A capacitor of 100 µF is charged to 50 V. How much energy is stored?

Accepted Answer

0.125 J

Answer

Energy stored in a capacitor: E = ½CV² = ½ × 100×10⁻⁶ × 50² = 0.125 J.

Question 4

In a series RLC circuit at resonance, the impedance is purely:

Accepted Answer

Resistive

Answer

At resonance, inductive and capacitive reactances cancel, leaving only the resistive component.

Question 5

What does the time constant τ represent in an RC circuit?

Accepted Answer

The time for the capacitor to charge to 63.2% of its final value

Answer

The time constant τ = RC is the time required for the capacitor voltage to reach approximately 63.2% of its final steady-state value.

BEE - Bachelor of Electrical Engineering Practice Test