Instrumentation Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Instrumentation Interview Questions

Questions Answers Views Company eMail

PID controller is used for which type of compensation…… a) lead comp. b) lag com. c) lead lag com.

Engineers India Limited,

12 23227

Induction type 1-p wattmeter reads ….. a) true value b) apparent value c)volt ampere value

Engineers India Limited,

3 8441

How much voltage we get between two wire of 4 to 20 ma output? Is this voltage up or down respectvice to 4 - 20 ma ?

9 14266

which type signal come control valve

6 10589

which type signal in & out in dcs

4 15508

Why we use 250 ohm resistor in series with HART protocol communication?

Chemtrols, Instec, Sabic,

13 57923

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.

1844

1.what is the role of proportional comtroller in pid controller?2.How do u calibrate the control valve?

Bently, IOCL,

3 11094

Why only negative 24 vdc supply give in vibration measuring system.

6 17504

why 1 to 5 vdc is used for output measurment

4 9147

if we have 380 KVA DG. how to calculate Power Factor. With detailed formula

1 6221

How to calibrate the magnetic flow meter and how to correct the flow if it is showing more flow.

Bohra Industries Limited, TCL,

5 27865

In electronic board one fuse(rating 230v,100ma)showing 2.5 ohms with multimeter,then the fuse is healthy or not.

4 7433

Which softwere is required to communicate the S7-300 processor

4 8278

What is the difference bitween control net scaner and device net scaner

Binani,

3550

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Un-Answered Questions { Instrumentation }

3. Differentiate between ultrasonic flowmeter and radar type flow meter.

2900

how to calculate orifice sizing? and tell me if pipe size bet 50mm t0 200mm then we can use pipe flange??? and above 250mm pipe size should i use D & D/2 Flange? is it right or wrong?

1853

What is furnace draft control?

1038

Explain the use of hair spring in the pressure gauge.

1055

when a magnet is heated?

1935

What is Span Error

648

How u measure the massflow in orifice flow measurement techniques

1372

Why upper weighing limit of electronics balance is 90% of the total weighing capacity?

2140

Can anyone convert a 5/2 way or 3/2 way valve into an ISO valve?

887

What is the difference between uv and ir scanners? and what is the workig principle of both

2338

what about your moleg in pogrees with company

2232

pls suggest suitable MOC of diaphragm for pressure measurement of UREA grade solution service fluid.

3085

I WANT SECURITY PAPER MILL, HOSHANGABAD TEST PAPER.KINDLY SEND TO MY MAIL ID

2724

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

1013

The Design Calculation of Level Transmitter For Different Structure open & Closed Vessel, Eg. Diff. Level Tx., Capacitance For Continous Operation

2820

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