BEE Electric Circuit Analysis 4

Question 1

An inductor of 200 mH carries a current of 5 A. What is the energy stored?

Accepted Answer

2.5 J

Answer

Energy = ½LI² = ½ × 0.2 H × (5)² = 0.1 × 25 = 2.5 J.

Question 2

In a purely inductive AC circuit, the current lags the voltage by:

Accepted Answer

90°

Answer

In a purely inductive circuit, current lags voltage by 90° because the inductor opposes changes in current.

Question 3

The bandwidth of a series RLC resonant circuit is given by:

Accepted Answer

BW = R/L

Answer

Bandwidth BW = R/L (rad/s) for a series RLC circuit, representing the range of frequencies where power exceeds half the maximum.

Question 4

In a delta (Δ) to star (Y) conversion, the star resistance connected to terminal A is:

Accepted Answer

(RAB × RCA)/(RAB + RBC + RCA)

Answer

In Δ-to-Y conversion, RA = (RAB × RCA)/(RAB + RBC + RCA).

Question 5

What does the imaginary part of complex impedance represent?

Accepted Answer

Reactance

Answer

The imaginary part of impedance Z = R + jX is called reactance X, representing energy storage (inductive or capacitive).

BEE - Bachelor of Electrical Engineering Practice Test