BEE - Bachelor of Electrical Engineering Circuit Analysis 1

Question 1

Thevenin's theorem states that any linear circuit with sources and resistors can be replaced by:

Accepted Answer

A single voltage source in series with a resistance

Answer

Thevenin's theorem simplifies any linear two-terminal network into an equivalent circuit consisting of a single ideal voltage source (Vth) in series with a single resistance (Rth), making complex circuit analysis much simpler.

Question 2

In a voltage divider with resistors R1 and R2 in series across a supply voltage Vs, the voltage across R2 is:

Accepted Answer

Vs × (R2 / (R1 + R2))

Answer

The voltage divider rule states that the voltage across any resistor in a series string equals the total voltage multiplied by that resistor's value divided by the total series resistance. Vout = Vs × R2/(R1+R2).

Question 3

The superposition theorem is applicable only to circuits that are:

Accepted Answer

Linear and bilateral

Answer

The superposition theorem requires the circuit to be linear (obeying proportionality) and bilateral (element behavior is the same in both directions of current flow). It allows each independent source to be analyzed separately, then results summed.

Question 4

In mesh analysis, which law is applied to write the equations for each mesh?

Accepted Answer

Kirchhoff's Voltage Law

Answer

Mesh analysis applies Kirchhoff's Voltage Law (KVL) around each independent loop (mesh) in the circuit. The sum of all voltage rises and drops around a closed loop equals zero, giving one equation per mesh.

Question 5

A purely inductive circuit carrying a sinusoidal current has a power factor of:

Accepted Answer

0

Answer

In a purely inductive circuit, current lags voltage by 90°. Power factor equals cos(90°) = 0, meaning no real (active) power is consumed — only reactive power is exchanged between the source and the inductor.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Circuit Analysis 1