EIAT Basic Electrical Principles 4

Question 1

What does the acronym 'EMF' stand for in electrical engineering?

Accepted Answer

Electromotive Force

Answer

EMF stands for Electromotive Force, which is the energy per unit charge supplied by a source like a battery or generator.

Question 2

A motor nameplate shows 240V, 10A. What is the motor's power rating?

Accepted Answer

2400 W

Answer

Power = V × I = 240 × 10 = 2400 W (2.4 kW).

Question 3

What is the purpose of a circuit breaker compared to a fuse?

Accepted Answer

A circuit breaker can be reset after tripping; a fuse must be replaced

Answer

A circuit breaker is a resettable protective device, while a fuse is a one-time-use device that must be replaced after it blows.

Question 4

In a three-phase power system, what is the phase difference between each voltage waveform?

Accepted Answer

120 degrees

Answer

In a balanced three-phase system, the three voltage waveforms are evenly spaced 120 degrees apart.

Question 5

What happens to current in a series circuit if one component fails (opens)?

Accepted Answer

Current flow stops completely

Answer

In a series circuit, all components share the same single path, so an open in any component stops all current flow.

EIAT - Elevator Industry Aptitude Test Practice Test