Licensed Electrical Contractor Electrical Contractor Electrical Theory & Fundamentals 3

Question 1

What happens to the total current in a parallel circuit when an additional branch is added?

Accepted Answer

Total current increases

Answer

Total current decreases

Answer

Total current stays the same

Answer

Total current drops to zero

Question 2

A single-phase motor draws 15 amps at 208 volts with a power factor of 0.85. What is the true power consumed?

Accepted Answer

2,652 watts

Answer

3,120 watts

Answer

2,080 watts

Answer

1,768 watts

Question 3

According to Kirchhoff's Voltage Law, what is the sum of all voltage drops and rises around any closed loop?

Accepted Answer

Zero

Answer

Equal to the source voltage

Answer

Equal to the total resistance

Answer

Infinity

Question 4

What is the unit of measurement for electrical capacitance?

Accepted Answer

Farad

Answer

Henry

Answer

Ohm

Answer

Coulomb

Question 5

A 14 AWG copper conductor has a resistance of approximately 2.525 ohms per 1,000 feet. What is the approximate resistance of a 250-foot run?

Accepted Answer

0.63 ohms

Answer

1.26 ohms

Answer

2.53 ohms

Answer

0.25 ohms

Question 6

In a three-phase system, what is the phase angle between each phase?

Accepted Answer

120 degrees

Answer

90 degrees

Answer

180 degrees

Answer

60 degrees