S95 Supervisory and Trouble Signals 2

Question 1

A supervisory signal is received at the fire alarm control panel indicating a valve has moved from its normal position. What is the FIRST action required?

Accepted Answer

Investigate and restore the valve to its normal position

Answer

Silence the supervisory signal and log it

Answer

Transmit an alarm signal to the fire department

Answer

Disable the supervisory zone until the next inspection

Question 2

Which of the following conditions would generate a TROUBLE signal rather than a supervisory signal?

Accepted Answer

A ground fault on a signaling line circuit

Answer

A dry-pipe valve that has operated

Answer

A fire pump that has started automatically

Answer

A pressure switch indicating low system pressure

Question 3

According to NFPA 72, how often must supervisory signals be tested in a system with central station monitoring?

Accepted Answer

Annually

Answer

Monthly

Answer

Quarterly

Answer

Semiannually

Question 4

A building fire alarm system displays a trouble signal with an 'open circuit' fault on initiating device circuit 3. What does this indicate?

Accepted Answer

A wire break or disconnection exists on circuit 3

Answer

A device on circuit 3 has activated

Answer

Too many devices are connected to circuit 3

Answer

Circuit 3 has a short circuit condition

Question 5

Which signal type is generated when a sprinkler control valve is closed more than 20% from the fully open position?

Accepted Answer

Supervisory signal

Answer

Alarm signal

Answer

Trouble signal

Answer

Supervisory or alarm depending on local AHJ

Question 6

A sprinkler system water flow switch activates but no sprinkler heads have operated. The MOST likely cause is:

Accepted Answer

Pressure surge or water hammer in the system

Answer

A supervisory signal being converted to alarm

Answer

A trouble condition on the flow switch wiring

Answer

Normal system test in progress without notification

Question 7

When a trouble signal is received at a protected premises FACP, NFPA 72 requires the trouble signal to be:

Accepted Answer

Acknowledged and investigated within 24 hours

Answer

Silenced immediately to avoid nuisance

Answer

Transmitted only if it persists for more than one hour

Answer

Escalated directly to an evacuation alarm