BEE FREE Bachelor of Electrical Engineering Electric Circuits Questions and Answers 2

Question 1

A 10 V source is connected across two parallel resistors of 4 ohms and 12 ohms. What is the total current drawn from the source?

Accepted Answer

3.33 A

Answer

The equivalent resistance is (4×12)/(4+12) = 3 ohms, so I = 10/3 = 3.33 A.

Question 2

In a series RLC circuit at resonance, which of the following is true?

Accepted Answer

The impedance is purely resistive

Answer

At resonance, inductive and capacitive reactances cancel, leaving only resistance.

Question 3

What is the time constant of a series RC circuit with R = 2 k-ohms and C = 50 microfarads?

Accepted Answer

0.1 seconds

Answer

The time constant tau = RC = 2000 × 50×10^-6 = 0.1 seconds.

Question 4

A node in an electric circuit has three currents: 5 A entering, 3 A entering, and one unknown current leaving. What is the unknown current?

Accepted Answer

8 A leaving

Answer

By Kirchhoff's Current Law, the sum of currents entering equals currents leaving, so the unknown current is 5 + 3 = 8 A.

Question 5

What is the maximum power transfer condition for a DC circuit with a source resistance of 50 ohms?

Accepted Answer

Load resistance equals 50 ohms

Answer

Maximum power is transferred when the load resistance equals the source resistance.

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