CEA Electrical Theory & Fundamentals 4

Question 1

An inductor in a DC circuit, after reaching steady state, acts as:

Accepted Answer

A short circuit (wire)

Answer

At DC steady state, an ideal inductor has zero reactance and acts as a short circuit (low-resistance wire).

Question 2

What is the relationship between inductive reactance (XL) and frequency?

Accepted Answer

XL increases as frequency increases

Answer

XL = 2πfL, so inductive reactance increases proportionally with frequency.

Question 3

Three 120 V light bulbs are connected in series across 360 V. What voltage appears across each bulb?

Accepted Answer

120 V

Answer

In series, voltage divides equally among identical loads: 360/3 = 120 V per bulb.

Question 4

What is the term for the ratio of true power to apparent power in an AC circuit?

Accepted Answer

Power factor

Answer

Power factor (PF) = True Power (W) / Apparent Power (VA), ranging from 0 to 1.

Question 5

Electrical energy is measured in:

Accepted Answer

Kilowatt-hours

Answer

Kilowatt-hours (kWh) is the commercial unit of electrical energy; utility bills are measured in kWh.

(CEA) Certified Electrical Apprentice Practice Test