ETC ETC Electrical Systems & Instrumentation

Question 1

What does the term 'voltage drop' refer to in an electrical circuit?

Accepted Answer

Reduction in voltage across a component due to resistance

Answer

Voltage drop is the reduction in electrical potential across a passive element caused by resistance in the circuit.

Question 2

Which instrument is used to measure electrical resistance in a circuit?

Accepted Answer

Ohmmeter

Answer

An ohmmeter is specifically designed to measure electrical resistance in ohms.

Question 3

What is the purpose of a circuit breaker in an electrical panel?

Accepted Answer

To protect wiring from overcurrent by interrupting the circuit

Answer

A circuit breaker automatically interrupts current flow when it exceeds safe levels, protecting wiring and equipment from damage.

Question 4

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

Accepted Answer

120 degrees

Answer

In a balanced three-phase system, each phase is separated by 120 degrees to evenly distribute power.

Question 5

Which type of sensor converts physical displacement into an electrical signal?

Accepted Answer

LVDT (Linear Variable Differential Transformer)

Answer

An LVDT converts linear mechanical displacement into a proportional electrical voltage output.

(ETC) Engineering Technician Certification Practice Test