CFPS Detection and Alarm Systems 2

Question 1

Under NFPA 72, which wiring class allows a single open or ground fault to render an entire circuit inoperable?

Accepted Answer

Class B

Answer

Class B circuits are not supervised for opens or shorts at every point, so a single fault can disable the entire circuit.

Question 2

A projected beam smoke detector measures which property to detect smoke?

Accepted Answer

Reduction in infrared light intensity across a path

Answer

Projected beam detectors measure attenuation of a light beam transmitted across a protected area; smoke reduces the received signal.

Question 3

NFPA 72 defines the Temporal-3 evacuation signal as:

Accepted Answer

Three short pulses, pause, repeated

Answer

Temporal Pattern 3 is 0.5-s ON, 0.5-s OFF, 0.5-s ON, 0.5-s OFF, 0.5-s ON, then 1.5-s OFF, repeated continuously.

Question 4

Which initiating device would be MOST appropriate to detect a slow smoldering fire in a large warehouse?

Accepted Answer

Air-sampling (aspirating) smoke detector

Answer

Air-sampling detectors actively draw air through a pipe network and can detect very low smoke concentrations produced by early-stage smoldering fires.

Question 5

What is the purpose of a duct smoke detector installed in an HVAC return-air duct?

Accepted Answer

To prevent smoke from being recirculated through the HVAC system

Answer

Duct detectors shut down the air-handling unit and close dampers to prevent smoke from spreading through the duct system to other areas.

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS Detection and Alarm Systems 2