Unit 04 CBT

What is a connection method of operating a reed switch in an alarm circuit?

• High temperature smoke surrounding the switch

• Providing a magnet close to the switch

• Provides heating near the switch

• Providing a coil point

What is the purpose of the radioactive source in a smoke Alarm?

• To repel smoke particles

• To attract smoke particles

• To provide a high resistance within the detector

• To provide a constant current flow within the detector

What is the supply arrangement for a security system?

• Rectified ac supply

• Primary cell battery

• Rectified ac supply with back up battery

• High voltage supply with back up battery

What does an end of line resistor connected in series with a normally closed call point do?

• Helps to prolong battery life

• Prevents short circuit currents

• Allows the control panel to detect a short circuit on the wiring

• Prevents the control panel from detecting an open circuit in the wiring

Why does a security panel have “zones”?

• To provide access control

• To permit admissible entry

• To monitor areas at the same time

• To be able to monitor areas individually

What modification is required to the circuit below so that an open circuit wiring fault can be detected by the alarm panel?

• Add a resistor in series with the existing resistor

• Add a resistor in parallel with the contact

• Change the contact to normally open

• Change the value of the resistor

Which connection arrangement for the detectors of a fully addressable fire alarm system is correct?

• The same detector type must be used in each zone

• Any detector can be connected on any zone

• The detector wiring will determine the zones

• No detector zoning is required for the installation

What is used to maintain the fire rating of a building with a plasterboard partition when cables pass through it?

• Fire foam

• Fire blanket

• Sand barrier

• Silicone sealant

Which installation method has the highest derating factor for power cables?

• In free air

• In trunking

• Clipped direct

• Embedded in insulation

What type of panel to remote base communication is used by security systems?

• Pulse Code Modulation to Frequency Division Multiplex

• Public Service Telephone Network to Ethernet

• Digital to analogue

• Analogue to digital