BEE FREE BEE Bachelor of Electrical Engineering DC and AC Circuit Analysis Questions and Answers 2

Question 1

A 10 Ω resistor and a 20 Ω resistor are connected in parallel across a 40 V DC source. What is the total current drawn from the source?

Accepted Answer

6 A

Answer

Parallel equivalent resistance is (10×20)/(10+20) = 6.67 Ω, so I = 40/6.67 ≈ 6 A.

Question 2

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

Accepted Answer

The impedance equals the resistance only

Answer

At resonance the inductive and capacitive reactances cancel, leaving only the resistance as the total impedance.

Question 3

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

Accepted Answer

Current leads voltage by 90°

Answer

In a purely capacitive circuit, the current leads the voltage by 90 degrees.

Question 4

A DC circuit has three resistors of 4 Ω, 6 Ω, and 12 Ω connected in parallel. What is the equivalent resistance?

Accepted Answer

2 Ω

Answer

1/Req = 1/4 + 1/6 + 1/12 = 6/12 = 0.5, so Req = 2 Ω.

Question 5

In an AC circuit, the real power consumed by a load with an impedance of 5∠60° Ω carrying 4 A rms is:

Accepted Answer

40 W

Answer

Real power P = I²R = 16 × 5cos60° = 16 × 2.5 = 40 W.

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