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

Specifying utility rate structures

Answer

Regulating electrical appliance manufacturing

Answer

Defining power grid interconnection rules

Question 2

In process control, what does PLC stand for?

Accepted Answer

Programmable Logic Controller

Answer

Power Line Controller

Answer

Pressure Level Calibrator

Answer

Phase Load Compensator

Question 3

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

Accepted Answer

USE-2

Answer

THHN

Answer

TW

Answer

NM-B

Question 4

What does calibration of an instrument ensure?

Accepted Answer

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

Answer

That the instrument operates at maximum speed

Answer

That the instrument is fully waterproof

Answer

That the device has been repaired after failure

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

To measure current flow in the main circuit

Answer

To convert AC power to DC for sensors

Answer

To store energy for momentary power loss

Question 6

Which test verifies the continuity of a grounding electrode conductor?

Accepted Answer

Earth continuity test

Answer

Insulation resistance test

Answer

Load bank test

Answer

Dielectric strength test