WTMA Basic Electrical Principles 5

Question 1

What does a transformer do in an electrical system?

Accepted Answer

Changes voltage from one level to another

Answer

A transformer uses electromagnetic induction to step voltage up or down between two circuits while transferring power.

Question 2

Which factor does NOT affect the resistance of a wire?

Accepted Answer

Color of the wire's insulation

Answer

The insulation color is a labeling convention only; resistance depends on length, material, and cross-sectional area.

Question 3

As the length of a wire doubles, its resistance:

Accepted Answer

Doubles

Answer

Resistance is directly proportional to length; twice the length means twice as much resistance.

Question 4

What is the function of a circuit breaker?

Accepted Answer

To automatically disconnect the circuit when current exceeds a set limit

Answer

A circuit breaker automatically trips and interrupts current when it exceeds a safe threshold, and can be reset after the fault is cleared.

Question 5

In which type of circuit does current have only one path to follow?

Accepted Answer

Series circuit

Answer

In a series circuit, all components are connected end-to-end forming a single loop with only one path for current.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test