CEP Electrical Theory & Principles 4

Question 1

A transformer has a turns ratio of 10:1 (primary to secondary). If the primary voltage is 480V, what is the secondary voltage?

Accepted Answer

48 V

Answer

Secondary voltage = Primary voltage / Turns ratio = 480 / 10 = 48V, as voltage is proportional to turns ratio.

Question 2

Skin effect in AC conductors causes current to concentrate:

Accepted Answer

Toward the outer surface of the conductor

Answer

At higher AC frequencies, eddy currents force the current toward the conductor's outer surface, increasing effective resistance.

Question 3

Norton's equivalent circuit consists of:

Accepted Answer

A current source in parallel with a resistance

Answer

Norton's Theorem represents any linear network as an equivalent current source (I_N) in parallel with a resistance (R_N).

Question 4

The relationship between charge (Q), capacitance (C), and voltage (V) is:

Accepted Answer

Q = C × V

Answer

The fundamental capacitor equation Q = CV shows that stored charge is proportional to both capacitance and voltage.

Question 5

When a conductor moves through a magnetic field, an EMF is induced. This is described by:

Accepted Answer

Faraday's Law of Electromagnetic Induction

Answer

Faraday's Law states that the induced EMF equals the rate of change of magnetic flux linkage through the conductor.

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