Dear Sir/Madam,im going to attend Hpcl written exams on feb 17th in instrumentation stream..can anyone send me the HPCL model papers and pattern of HPCL ....i ve not yet attended anything in HPCL...so i dont know how it comes...so just i need some model test papers and pattern ..pls help me friends...

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what is diffrance between FF & SMART, explain with difination

0 Answers   Bapco Bahrain Petroleum Company,

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Steve said that "An eddy-current probe works by passing an alternating current through a coil of wire and measuring the coil’s impedance" while we are using -24 Volt DC , So I am confused about DC and AC. Plz .

2 Answers   Jindal, Sadara Chemicals,

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What is the use of double seated valve?

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What is a PID?

6 Answers  

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How to calibration a control valve?

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In closed loop control there are several “blocks” used to show the interactions between the process and the control system. These blocks are referred to as the “process” and the “controller.” Describe the relationship between these two blocks when creating a well tuned control loop.

1 Answers  

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what is difference between hart signal and analog signal (4 to 20 ma)

2 Answers   Takreer,

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How oil line flow measured?eplain about instruments used and working principle?

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If I want to buy a pressure switch & 3-way valve for hot water application then witch parameter I should consider.

1 Answers  

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Why ac supply load cell is used? Can we use the dc supply load cell?

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how to set calibration range in a DP transmitter to measure level for a closed tank and for an open tank,and also please explain me how to set calibration range for a DP flow transmitter in a line ?

1 Answers   CCL Products, IOCL,

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