FC A School Basic Alarms

Buzzers that are AC operated have __________ contacts.

No

A ________________ current runs between the alarm module and the resistor.

6 Volts

What component enables a horn to produce sound?

Diaphragms

What are the three conditions that result from an alarm module regarding the monitoring of the return current?

Normal, Alarm, and Trouble.

Where is the supervisory resistor placed in the circuit?

Parallel to the alarm contacts of the last sensor in the contact.

True or False. The supervisory resistor monitors the sensor, not the electrical connections.

False

What audible signal device is used in quiet spaces?

Buzzer

What are the types of Horns used in the alarm safety and warning systems?

1. Motor-operated

2. Non-resonated

3. Resonated

What does "Dials" refer to on the visual indicator?

Number of lights on the indicator.

How are lights connected in the visual indicator?

In parallel and mounted behind each dial.

What are the 3 major units of the detector head in an lonization detector?

1. Outer Chamber

2. Inner Chamber

3. Cold Cathode Tube

Name the seven types of switches used with the alarm systems.

1. Liquid level float

2. Manual

3. Mechanical

4. Mercury Thermostatic

5. Thermostatic

6. Pressure

7. Water

How many sets of contacts does a single-pole, single-throw switch have?

1 set

What makes the IC/DM door mounted switch "tamper proof"?

Because there are 2 sets of switches, one for the switch cover and one for the door itself.

What acts as the conductor in the water switch, shorting the contacts to activate the alarm?

The presence of salt water.

What switch is used with the high temperature alarm system (CKT F)?

IC/J thermostatic switch

What are the temperature ranges of the mercury thermostatic switch and what are their colors?

RED - 105°F used in magazines.

BLACK 125°F used in storerooms and paint lockers.

BLUE 150°F used in all other spaces (ie. mess, decks, berthing, and office.

What are the two switch types and circuit designations of liquid level float switches?

Water (IC/RL and CKT FD) and Oil (IC/RH and CKT TD)

What is the only switch with a single pole double throw?

Door mounted switch

What is the switch type and circuit designation of a pressure switch?

IC/L and CKT N/A

Which liquid level float switch is reversible and is used with oil applications?

IC/RH

A sensitive switch is also referred to as a ____________________.

micro switch

The components of the liquid level float switch are contained within a __________________ cylinder housing.

Clear

The supervisory resistor must be placed at the ____________ of a circuit.

End

What type of switch is activated by the pressure or vacuum of a gas or liquid?

Pressure switches

What type of sensing device is used to sense gas or smoke?

Ionization Detectors

What type of switch is operated by the physical movement of a mechanism?

Mechanical switches

___________ use internal circuitry to activate an alarm that alerts personnel of hazardous conditions.

Detectors

The alarm switchboard is a(n) ______________ system installed onboard ship for the detection and warning of a variety of important functions or conditions that require continuous monitoring.

Electrical

What is the circuit designation of the liquid level alarm?

TD

What is the circuit designation of the magazine sprinkling alarm?

FH

What is the circuit designation for the high temperature (fire) alarm?

F

What part of the Alarm, Safety and Warning System monitors selected spaces and equipment?

Alarm switchboards and panels.

What is the circuit designation of the secure communications space door alarm (intrusion).

DL

What is the circuit designation of the flooding alarm?

FD

What is the circuit designation of the high security alarm (classified)?

FZ

What is the circuit designation of the airflow indicator alarm?

HF

Water Switch

Mercury Thermostatic Switch

What tool do you use on switches or detectors?

Burnishing tool

What common faults do you get on switches?

Pinched wires and broken terminal lugs (connections).

What is the switch type and circuit designation of a thermostatic switch?

IC/N and CKT N/A

What is the switch type and circuit designation of a mercury thermostatic switch?

IC/J and CKT F

What is the switch type and circuit designation of a door mounted switch?

IC/DM and CKT FZ

What is the switch type and circuit designation of a water switch?

IC=N/A and CKT FH

What is the switch type and circuit designation of a water liquid level float switch?

IC/RL and CKT FD

What is the switch type and circuit designation of a oil liquid level float switch?

IC/RH and CKT TD and is reversible.