BEE BEE Bachelor of Electrical Engineering Fundamental Circuit Analysis Questions and Answers 3

Question 1

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

Accepted Answer

0.125 J

Answer

Energy stored is E = ½CV² = 0.5 × 100×10⁻⁶ × 50² = 0.125 J.

Question 2

In a balanced Wheatstone bridge, what is the current through the galvanometer?

Accepted Answer

Zero

Answer

A balanced Wheatstone bridge has equal voltage at both midpoints, so no current flows through the galvanometer.

Question 3

What is the phase angle between voltage and current in a purely inductive AC circuit?

Accepted Answer

Voltage leads current by 90°

Answer

In a purely inductive circuit, the voltage across the inductor leads the current through it by 90°.

Question 4

Three identical 9Ω resistors are connected in delta. What is the equivalent resistance of each arm when converted to a star (Y) configuration?

Accepted Answer

3 Ω

Answer

For a balanced delta-to-star conversion, each star resistor equals R_delta/3 = 9/3 = 3Ω.

Question 5

A practical voltage source has an EMF of 12V and an internal resistance of 0.5Ω. What terminal voltage does it deliver to a 5.5Ω load?

Accepted Answer

11 V

Answer

Current is 12/(0.5+5.5) = 2 A, and terminal voltage is 12 − 2×0.5 = 11 V.

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