BDS Power Systems and Standby Powering 2

Question 1

What is the standard frequency of AC power delivered by HFC cable plant power supplies in the United States?

Accepted Answer

60 Hz

Answer

50 Hz

Answer

400 Hz

Answer

1 kHz

Question 2

What is the purpose of output fusing in a cable plant power supply?

Accepted Answer

To protect the coaxial plant from damage due to overcurrent conditions

Answer

To regulate the output voltage to the correct level

Answer

To amplify the RF signal passing through the supply

Answer

To prevent lightning surges from entering the headend

Question 3

When measuring AC voltage on an energized coaxial cable in an HFC outside plant, which instrument should be used?

Accepted Answer

True RMS AC voltmeter rated for use on RF-carrying conductors

Answer

Standard household voltage tester

Answer

DC clamp meter

Answer

Ohmmeter connected to the outer shield

Question 4

What is the typical maximum output current rating for a standard HFC outside plant power supply?

Accepted Answer

15-20 amperes

Answer

1-2 amperes

Answer

5-10 amperes

Answer

50-100 amperes

Question 5

What is a 'power hog' in the context of HFC cable plant powering?

Accepted Answer

An active device that draws significantly more current than its specification

Answer

A power supply that dissipates excessive energy as heat

Answer

A device that causes elevated RF interference levels

Answer

A battery string that cannot hold a full charge

Question 6

What does 'power budget' refer to in HFC outside plant design?

Accepted Answer

The total current capacity of a power supply allocated across all powered devices on a segment

Answer

The financial cost of operating the cable plant power system

Answer

The RF signal power level available at the end of a cable run

Answer

The generator fuel consumption rate during a utility outage

Question 7

What is the primary role of a voltage regulator in an HFC cable plant power supply?

Accepted Answer

To maintain a stable output voltage despite variations in utility input or connected load

Answer

To amplify RF signals passing through the supply housing

Answer

To convert single-phase utility power to three-phase output

Answer

To limit battery charge rate and extend battery service life