S95 Components and Power 2

Question 1

What is the minimum secondary (standby) power duration required for a fire alarm system connected to a supervising station?

Accepted Answer

24 hours standby plus 5 minutes alarm

Answer

4 hours standby plus 5 minutes alarm

Answer

8 hours standby plus 15 minutes alarm

Answer

48 hours standby plus 5 minutes alarm

Question 2

Which battery chemistry is most commonly used as the secondary power source in fire alarm control panels?

Accepted Answer

Sealed lead-acid (SLA)

Answer

Lithium-ion

Answer

Nickel-cadmium

Answer

Carbon-zinc

Question 3

How must a fire alarm system respond when primary AC power is lost?

Accepted Answer

Transfer to secondary power immediately and automatically with no interruption

Answer

Transfer to secondary power within 60 seconds

Answer

Transfer to secondary power within 10 seconds

Answer

Sound a trouble signal and initiate a controlled shutdown

Question 4

What AC input voltage variation must a listed fire alarm system power supply withstand without operational impairment?

Accepted Answer

±15%

Answer

±5%

Answer

±10%

Answer

±20%

Question 5

When a fire alarm control panel displays a 'power trouble' indication, what is the FIRST supervisory action?

Accepted Answer

Verify that primary AC power is present at the panel

Answer

Reset the panel immediately

Answer

Replace all batteries

Answer

Silence the trouble buzzer and schedule service for next week

Question 6

What device within the fire alarm control panel monitors the primary power supply for loss or degradation?

Accepted Answer

A power supervision relay or dedicated supervisory circuit

Answer

A current-limiting resistor

Answer

A fuse block

Answer

A voltage regulator

Question 7

How frequently must fire alarm system batteries undergo a full discharge (load) test per NFPA 72?

Accepted Answer

Annually

Answer

Monthly

Answer

Quarterly

Answer

Every five years