30/01/2018
FIRE ALARM SYSTEM
1:What is the operating philosophy of Fire alarm detection system?
Smoke detected by sensor sends electrical signal to controller which gives audio visual alarms.
2:What is the NFPA standard for inspection, testing & maintenance of fire alarm system?
NFPA 72
3:What is the different between addressable detection & conventional detection system?
In addressable detection every detector and controller has individual addressable programmed to identity their alarm/normal status in conventional detection system the detector and controller have no individual address programmed to identity their alarm.
4:What is “EOL” in fire system? Why it is necessary in system?
EOL is an end of line component used in system for monitoring open circuit condition.
5:As per the NFPA standard what are the circuit classification of wiring class A & class B?
Class –A is a 4 wire circuit where 2 wires of the circuit leave the control panel. Class-B is 2 wire circuits where two wires leave the control panel, make connection to the field devices and then connect to an “END-OF-LINE” device.
6:What are the types of smoke detector?
Type of Smoke detector is ionization, Optical, photo & VESDA detector.
7:What are the types of Heat detector?
Type of Heat detector is fixed heat detector used for outdoor installation and rate of rise detector for indoor installations.
8:What is the mean of VESDA ? How the system identifying smoke?
VERY EARLY SMOKE DETECTION ASPIRTION.During the scan of air samples.
9:Simply describe with wiring diagram for RS 232 communication?
Connector point 2nd-Rx In,3rd-TX out & 5th-ground.
10:What are the types of gas detector used in gas detection system in oil field?
Hydrocarbon detector,(HC)Hydrocarbon supplied(H2S),Hydrogen detector(H2),Oxygen(O2),and Chlorine detector.
11:What is the mean of LEL & UEL?
LEL=Lower Explosion Level,UEL=Upper Explosion Level.
12:What is the operating philosophy of public address system?
Ans:-Sound from mike is received in control with PSU,CPU,pre amplifier,and Matrix Amplifire and is send to speakers in field for audio hearing.
