ETC ETC Electrical Systems & Instrumentation 3

Question 1

What is the National Electrical Code (NEC) primarily used for?

Accepted Answer

Setting safety standards for electrical installations in the US

Answer

The NEC (NFPA 70) establishes minimum safety requirements for electrical installations to protect people and property.

Question 2

In process control, what does PLC stand for?

Accepted Answer

Programmable Logic Controller

Answer

A Programmable Logic Controller is an industrial digital computer used to automate electromechanical processes.

Question 3

Which type of wire insulation is rated for wet locations and direct burial?

Accepted Answer

USE-2

Answer

USE-2 wire is rated for wet locations, direct burial, and service entrance applications.

Question 4

What does calibration of an instrument ensure?

Accepted Answer

That readings are traceable to a known standard and within acceptable accuracy

Answer

Calibration verifies and adjusts an instrument's output against a traceable reference standard to ensure measurement accuracy.

Question 5

What is the purpose of a control relay in an industrial circuit?

Accepted Answer

To use a low-power signal to switch a higher-power circuit

Answer

A control relay uses an electromagnetically operated switch to allow a low-current control circuit to operate a high-current load circuit.

(ETC) Engineering Technician Certification Practice Test