Answer / andy

electro-catalytic detectors detects change in resistance
whereas ir-type detectors detects changes in intensity of IR
spectrum and alerts the system whenever they detects a fire

Answer / gautam_etrx.engg

Ultraviolet rays (Earlier it was infrared rays)

Answer / faiyaz

Fire detector detect the fire like UV-ultra violet ray and IR means Infra ray both are fire one is small fire and one is big fire generally used in Hazard area like compressor and condensate area

Answer / saumyajit

in fire detectors normally we use photo resistors,which is used in wheatstone bridge circuit,in photo resistor conductivity changes as light intensity change.or we cud use photo diodes.(PN-diode,PIN-diode,avelanche diode)

what is flow equation of kg/hr to m3/hr

2 Answers   Philips,

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what is differences between singal acting and double action valve

1 Answers   Carlo Gavazzi, Welspun,

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what should be distance from tapping point to inallation place of instruments?

3 Answers   Tasnee Petrochemicals,

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What output voltage the proximity switch shows when it is in open enviornment?

1 Answers  

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why we are using digital signals for I/O & how to measure this signals is getting or not ?

0 Answers  

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wHAT IS BURST MODE IN TRANSMITTER?

1 Answers   Bhel,

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if we put any thermocouple on a table in a room without any connection,what temperature should it show.

3 Answers  

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what is function of PLC, and how is it work , explain with difination

1 Answers   Bapco Bahrain Petroleum Company,

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we re giviang 24v supply to transmitter and we getting output from tx?now my question is wht we call this complete proces?

2 Answers  

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how can leve transmetter calibate in feild .and also put cv and flow plz .....

0 Answers   IBM,

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What is Modbus communication

0 Answers  

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I have applied the post Junior Engineer-(TM)in R.R.B CHANDIGARH recently . what type of question i have to practice and which book ?. can i get any model question paper?

3 Answers   RRB,

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