CTE Power Systems & Grounding 2

Question 1

What is the primary function of a rectifier in a telecommunications DC power system?

Accepted Answer

To convert AC utility power to DC power for telecommunications equipment and battery charging

Answer

A rectifier converts incoming AC utility power to regulated DC power, simultaneously powering equipment and floating/charging the battery strings in the DC plant.

Question 2

What does VRLA stand for in telecommunications battery technology?

Accepted Answer

Valve-Regulated Lead Acid

Answer

VRLA stands for Valve-Regulated Lead Acid, referring to the pressure-relief valve design that makes these batteries sealed and maintenance-free compared to flooded lead-acid batteries.

Question 3

What is the typical float voltage per cell for a valve-regulated lead-acid (VRLA) battery in a telecom application?

Accepted Answer

2.23V

Answer

VRLA batteries in telecom systems are typically floated at approximately 2.23–2.27V per cell to maintain full charge without overcharging and causing excessive gassing.

Question 4

What is the purpose of an Automatic Transfer Switch (ATS) in a telecommunications facility?

Accepted Answer

To automatically switch between primary and alternate power sources when the primary source fails

Answer

An ATS automatically detects loss of the primary power source and switches the load to an alternate source (such as a generator or secondary utility feed) to maintain continuity of power.

Question 5

Which standard defines environmental and power requirements for equipment installed in telecommunications central offices?

Accepted Answer

GR-63-CORE (NEBS Level 3)

Answer

GR-63-CORE is the Telcordia NEBS standard defining spatial, environmental, earthquake, fire resistance, and power requirements for central office telecommunications equipment.

CTE - Certified Telecommunications Engineer Practice Test

CTE - Certified Telecommunications Engineer Practice Test

CTE Power Systems & Grounding 2