Answer / rajesh

analog signal is variable signal. digital signal contains 2
states 1 or 0.

Answer / s.jayaram

Digital signal is nothing but voltage state is 1 or 0
whereas Analog signal is voltage, current, frequency varies.

Answer / manoj

Analogue signal is in any wave form which varies as time graph changes
digital signal is in data form ie ON or OFF state in other words it is in 0 and 1 state

Answer / divya

digital signal is the one type of discrete signal.this can
be represented by 0's and 1's.
analog signal is an a.c. signal. this can be represented by
different signals like sinusoidal,square wave,triangular
etc..........

what do you mean by CJC (cold junction compensation).?

5 Answers   Jindal,

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The wire is disconnected from the temperature sending unit (magnetic gauge). A voltmeter connected to the wire reads 0v. What does this indicate?

2 Answers  

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We do have a problem in the company that is one PT connected to PlC which is mean 1 out of 1 in PLC system we do have the PAHH is 55 mbar and PALL 8 mbar with a timer of 15 sec for the PAHH the problem started when PAHH goes more than the set point which is 55 it reached up to 71 but due to timer doesn't trip . We force it and we checked everything nothing there . We replaced the transmitter problem still there the reading goes more than the 55 bar the range for transmitte is 0- 60 mbar . So we did loop check , aculaizing valve , wiring all are okay . What the possible causes for this ???

2 Answers   National Petrochemical Company,

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How will you calibrate an interface level trol/normal level trol in line and in w/s?

1 Answers   CCIE,

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What the basic of communication?

4 Answers   Schneider,

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what is plc?

27 Answers   HPCL, KRL, Noor Company, Petrochemicals, SS Automation,

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(1) In turbine, what does term CDP, NI, NH, HSSOC, means. (2) What is the purpose of LO overhead tank in turbines.(3) An equipment is certified for EEX, IA, IIC,T6, what do you under stand by this.(4) what is SURGE, and how it is prevented, what is the purpose of bypass valve across AS valve.(5) Give 2 application of quartz crystal used for process parameter measurement.(6) what is meant by cold float of compressor shaft. (7) state four different types of flow measurement. For gas flow measurement mmscfd is the common unit. Expand the unit and specify significance of word S in the unit.(8) what is meant by Gap voltage, in vibration measurement. Normally how much Gap voltage is set and state the reason.(9) what will the new flow factor if D/P transmitter is Re-Ranged from 25” wc to 50” wc.(10) what is the usage of QDV & Volume booster.

0 Answers   ADMA OPCO,

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give me all the details about the interview and which type of question being asked

0 Answers   Jindal,

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what is Analog input/output & Digital input/output,

2 Answers   Bapco Bahrain Petroleum Company,

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Explain Three way boiler.

2 Answers   L&T,

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How a conductivity sensor & analyzer work at boiler, whats the principle & science is beyond this,How conductivity sensor sence & convert signal & move toward analyzer & analyzer show reading in percent? also what is temperature compensate option in conductivity analyzer

0 Answers  

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What is the full form of PMMC ?

7 Answers   DVC,

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