NICET Electrical Systems for Fire Protection 3

Question 1

What wire gauge is most commonly used for fire alarm initiating device circuits?

Accepted Answer

22 AWG

Answer

18 AWG

Answer

14 AWG

Answer

10 AWG

Question 2

In a two-wire smoke detector circuit, how is the detector powered?

Accepted Answer

From the same pair of wires that carries the alarm signal

Answer

By a separate dedicated power supply circuit

Answer

By an internal lithium battery only

Answer

From a Class 2 power supply separate from the panel

Question 3

What is the purpose of an isolation module in an addressable fire alarm loop?

Accepted Answer

Isolate a section of the loop that develops a short circuit while keeping the rest operational

Answer

Amplify signals on long cable runs

Answer

Convert analog signals to digital

Answer

Provide backup power to remote devices

Question 4

Which type of power supply provides the MOST reliable protection against AC power interruptions for fire alarm systems?

Accepted Answer

Online UPS with sealed lead-acid batteries

Answer

Dual-circuit AC feeds

Answer

Generator backup alone

Answer

Capacitor-based power backup

Question 5

What does a ground fault trouble signal on a fire alarm panel indicate?

Accepted Answer

An unintended electrical connection between a circuit conductor and ground

Answer

The battery voltage is low

Answer

A device has been removed from the circuit

Answer

The panel's processor has detected an internal error

Question 6

According to NFPA 72, what is the maximum time a fire alarm control unit may take to indicate a trouble condition after a fault occurs?

Accepted Answer

100 seconds

Answer

5 seconds

Answer

30 seconds

Answer

200 seconds