Instrumentation Interview Questions
Questions Answers Views Company eMail

There are many type of control cable like pair,core,tried, What are defination each one

Birla,

1725

How to work togather like sov,limit switch,proxy switch and booster in xv

3728

in a power plant main steam flow is volumetric or mass flow? is it required compensation?

Wartsila,

1 4596

what do u mean by compensation n pid tunning?in pid tunning what you tunned?is it possible 2 tune p i d

2 4348

how u meassure room temp?is it possible 2 meassure room temp by rtd or thermocouple?between rtd n thrmocouple which is more regard?3 meassure diff. between rtd n thermocouple?

3 5346

how many types of spped sensors n vibration sensors?their basic principle n connection?

IOCL, ITC Infotech,

2063

can a control valve works without positioner?why need tunning of c/v?

4 6934

why need 3 element system in power plant? if it is not there then what l happen?

5 10694

what is axial shift n what is differential expansion in turbine? how many sensor probes r mounted for this n how it works?

Apple,

2 31607

basic connection and principle of axial shift sensor n differential sensors in tubine describes n draw......

1888

in a power plant which system are compensated?

2 4596

what do u mean by 2/3 soleniod valves?

Nile Sugar,

8 32887

how to calibrate the interface leveltrol

Lanco,

1 6010

what is the reason for flow fluctuations happen on differential flow transmitter during in service

2 4506

what is the path to communicate from profi to ofc.what is the means of communication.what is multi cire cable in ofc.

1 3411


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Un-Answered Questions { Instrumentation }

hi friends,im an instrumentation and contol engg student,can u hlp me of suggsting barc written question paper,my id is roysuvaranjan@gmail.com, cel no.9563591747

1564


I want to know the questions asked in ONGC interview(after being selected in the written exam) for Instrumentation branch.Kindly help.

1755


how to commission furnace ( water heater)

1493


full process of gas turbin?

1547


NPN transistor, SCR, Zener diode, LED, Varactor diode, Vortex meter, RTD, Resistor, Crystal

1731






I am having a Phoenix digital to modbus converter. The o/p of the same is connected to flow computer FB407. But the digital signals are updated only after one minute in the flow computer. what may be the cause of delay in communication? Flow computer is having a scanning period of less than 1 sec.

1456


Draw a simple circuit for a well head control panel used to protect the well against fire, leak, blockage, ESD, & controls the operation of one downhole & one surface safety valve. Explain the operation and controls

1151


Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

1642


What is voltage regulator?

623


What is the difference between modbus,fieldbus & profibus

1864


What is the diffrence between ff tx and non ff tx

2444


What happen if I install my pressure transmitter below the elevation of pipe in natural gas service?

720


A length of steel pipe is used to carry sea water to a desalination plant. An adequate corrosion allowance must be specified and indicated in the piping specification, which affects the _________________________ of the pipe

1778


why orfice is not used for main steam flow calculation

1593


is there any digitel grevity meter availaible in the market by which we can measure specific gravity of a battery?

1786