ETC ETC Electrical Systems & Instrumentation 2

Question 1

What is the function of a rectifier in an electrical system?

Accepted Answer

Converts AC to DC

Answer

A rectifier converts alternating current (AC) into direct current (DC) using diodes or thyristors.

Question 2

Which grounding method directly connects the neutral point of a transformer to earth?

Accepted Answer

Solid grounding

Answer

Solid grounding directly connects the neutral to earth, providing a low-impedance fault path for safety.

Question 3

What is the purpose of a power factor correction capacitor bank?

Accepted Answer

To reduce reactive power demand and improve power factor

Answer

Capacitor banks supply reactive power locally, reducing the reactive current drawn from the utility and improving power factor.

Question 4

What does IP65 rating indicate for electrical enclosures?

Accepted Answer

Dust-tight and protected against water jets

Answer

IP65 means the enclosure is completely dust-tight (6) and protected against low-pressure water jets from any direction (5).

Question 5

Which device is used to measure the insulation resistance of electrical cables?

Accepted Answer

Megohmmeter

Answer

A megohmmeter applies high DC voltage to measure insulation resistance, typically in megaohms, to assess cable integrity.

(ETC) Engineering Technician Certification Practice Test