BEE Basic Electrical 4

Question 1

Norton's theorem represents a network as:

Accepted Answer

A current source in parallel with a resistance

Answer

Norton's equivalent is a current source I_N in parallel with R_N at the terminals.

Question 2

The power factor of a purely resistive circuit is:

Accepted Answer

1

Answer

In a purely resistive circuit voltage and current are in phase, so PF = cos(0°) = 1.

Question 3

A wire carries 3 A and has a resistance of 0.5 Ω. What is the voltage drop across it?

Accepted Answer

1.5 V

Answer

V = IR = 3 × 0.5 = 1.5 V.

Question 4

Faraday's law of electromagnetic induction states that the induced EMF is proportional to the:

Accepted Answer

Rate of change of magnetic flux

Answer

Faraday's law: EMF = -dΦ/dt; the induced EMF equals the rate of change of magnetic flux linkage.

Question 5

What is the impedance of a series RLC circuit at resonance?

Accepted Answer

Equal to R only

Answer

At resonance, X_L = X_C, so they cancel and Z = R.

BEE - Bachelor of Electrical Engineering Practice Test