Electrician Electrical Theory and Math 3

Question 1

A transformer has a primary voltage of 480V and a turns ratio of 4:1. What is the secondary voltage?

Accepted Answer

120V

Answer

60V

Answer

240V

Answer

1920V

Question 2

What is the formula for calculating the area of a circle (used for conduit fill calculations)?

Accepted Answer

A = πr²

Answer

A = πr

Answer

A = 2πr

Answer

A = πd

Question 3

If a circuit has apparent power of 5 kVA and true power of 4 kW, what is the power factor?

Accepted Answer

0.8

Answer

0.5

Answer

0.6

Answer

1.25

Question 4

What does Kirchhoff's Current Law (KCL) state?

Accepted Answer

The sum of all currents entering a node equals the sum leaving it

Answer

The sum of voltage drops equals the source voltage

Answer

Current is the same throughout a series circuit

Answer

Resistance increases with temperature

Question 5

What is the reactance of a capacitor called?

Accepted Answer

Capacitive reactance

Answer

Inductive reactance

Answer

Impedance

Answer

Conductance

Question 6

Two resistors of 6 ohms each are connected in parallel. What is the total resistance?

Accepted Answer

3 ohms

Answer

12 ohms

Answer

6 ohms

Answer

1 ohm