Instrumentation Interview Questions
Questions Answers Views Company eMail

Sir, my yokugava FF TYPE LEVEL transmitter us bad, i don't have spares available, i want to replace it with a Rosemount FF transmitter, please tell me what procedure to be followed and what changes to be done in dcs part.

BPCL Bharat Petroleum, OEG,

1 2873

In my plant I want to mount a steam flow transmitter .Flow nozzel is already mounted in steam line .So how can i know the range to put in flow transmitter?

1 1760

What you mean by multi stage control vavles?

1374

Can we get the outpot in c without using getch fiction? Answer is yes but output will stay on display 4 only few second.... But can we get output without using getch and also output will hold on the display...?

1 2058

Why we. Don't measure current in parallel? Why we measure current in series and why we measure voltage in parallel only?

Almeer Technical Services,

2 4305

if found error in magnetic flow meter?how can we adjust?

ANI Instruments, Techint,

2 3091

what is mass flow meter, working principle of mass flow meter and its installation.

2 2912

I have one problem for masoneilan displacer type LT.I give some imformation in data shéet given for liquid level range 0 to 600 mm and sg .955 problem is 0% is ok 25%(23%) or 50%(48%)and 75%(73%) and 100% is ok this is up value and down value all ok so please halpe me

Hyundai, TATA,

2 4060

How to calibrate radar type level transmitter for interface level? Total liquid(liq.1 and liq.2), level both the liq individually? For. Both the liquid levels how the signal will go from transmitter to dcs? How to calibrate. Single radar 9:26:55 AM for 2 different liquids in a tank?

Almeer Technical Services,

1571

my temperature transmitter in field showing 700 degree , whereas in dcs showing 459 degree, how to resolve this?

ONGC,

4 5127

Controller not working in auto mode?...what are the problem can occur...Pls explain

Aramco,

1 3098

Yokogawa mass flow meter shows negative reading...what r the main causes for this problem?...

IOCL,

3 8564

How does temperature bath work? How does coil gets heated only by applying some current?

Process Control Technologies,

1331

In bimetallic temp. Gauges why does metal strip bend? Why do we use low expansion factor metal and high expansion factor metal in bimetaliv strip?

Process Control Technologies,

1 2299

In control valves (like feed water control valve) we will give 3 kg pressure and how it controls 110 kg of water pressure?

SSL,

4 4088


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Un-Answered Questions { Instrumentation }

dear friends, i have seen flow as the selection critriea in presure guage (bourdon tube) and i would like to know what is the relation between flow and performance of pressure guage other parameters i found in the data sheet are pressure max. 1ksc temperature max. - 50 deg c line size - 80NB operating range - 1ksc pr. guage range - 0-2 ksc thank u,

1721


What is the exact differences between HART,FOUNDATION FIELDBUS,PROFIBUS?

3001


How can a d.p. Transmitter be calibrated?

674


What are the charcterstics of a P&ID controller block for Governor speed raise or lower for a load sharing functionality between 4 Gas turbines in droop mode.

2484


Define the difference between a stable versus an unstable controlled system and some of the tools you might use to be able to detect when this is happening and assumptions used for control system application design that could contribute to instability

1386






What is the difference between working pressure and calibration pressure of a control valve

2572


Describe the function of Accumulator into the Pump

1477


How flow can be measured with dp?

667


why micro controller 8051/52's clock frequency is internally divide by 12 ?? and why it is further divide by 32 in UART serial communication ??

6849


Why is it necessary to use compensation leg to measure the liquid level in a closed or pressurized tank?

1900


What is the meaning of wet leg

669


Drum level tx with GP4 with zero elevation:7300mmh20 on HP and 8050mmh2o on LP as range but on commissioning the tx readiing is max,Why this reading?

1487


how to check earthing,what is minum ohms for proper earthing

1508


how do we commission inergen system?

1423


how to calibrate electro pneumatic positioner 8013 mil controls ltd ?gsr

7439