EIAT and NEIEP Test Electrical Theory 3

Question 1

What is the effect of increasing temperature on most conductors?

Accepted Answer

Resistance increases

Answer

In most conductors, higher temperatures increase atomic vibration, impeding electron flow and increasing resistance.

Question 2

A transformer is used to:

Accepted Answer

Step voltage up or down

Answer

A transformer uses electromagnetic induction to step AC voltage up or down between two or more circuits.

Question 3

What is a diode's primary function in a circuit?

Accepted Answer

Allow current to flow in one direction only

Answer

A diode allows current to flow in only one direction (from anode to cathode), acting as a one-way valve.

Question 4

The term 'ground' in an electrical circuit refers to:

Accepted Answer

A reference point at zero potential

Answer

Ground (earth) serves as a reference point at zero electrical potential and provides a safe path for fault current.

Question 5

Three-phase power is most commonly used in:

Accepted Answer

Industrial motors and machinery

Answer

Three-phase power is used in industrial settings because it efficiently powers large motors and machinery.

EIAT and NEIEP Test Practice Test