Instrumentation questions and answers pdf


Control Systems Multiple Choice Questions Question 1 Cascade control is characterized by: (A) a special relay or function block to compensate for nonlinear. Top Instrumentation Engineering Questions & Answers Collection. Read Instrumentation Basic Questions and Answers for your Interview preparation. Instrumentation Interview Question and Answers - Download as Word Doc .doc / .docx), PDF File .pdf), Text File .txt) or read online. question answer.

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Instrumentation Questions And Answers Pdf

50 Instrumentation Interview Questions and Answers - Download as PDF File . pdf), Text File .txt) or read online. inst. INSTRUMENTATION Engineering Interview Questions and Answers pdf free download,INSTRUMENTATION Engineering multiple choice. + Industrial Instrumentation Interview Questions and Answers, Question1: What are the process Variable? Question2: Define all the process Variable and.

Suppressing the influence of external disturbances, Optimizing the performance, Increasing the productivity, Cost effective. Any system comprised of dynamic variables usually involved in manufacturing and production operations. It is defines as a series of operations during which some materials are placed in more useful state. It is a variable which is altered by the automatic control equipment so as to change the variable under and make it conform with the desired value. It is the quantity of control system which is directly measured and controlled. The output will move from one steady state to another for the sustained change in input. It is the tendency of the process to adopt a specific value of controlled variable for nominal load with no control operations. The physical equipment of the chemical process we want to control have not been constructed. Consequently we cannot experiment to determine how the process reacts to various inputs and therefore we cannot design the appropriate control system. If the process equipment needs to be available for experimentation the procedure is costly.

They should be of the same material as the thermocouple What is the difference the Wheatstone bridge and a potentiometer? The difference between a potentiometer and a Wheatstone bridge measuring instrument is that potentiometer is a voltage measuring instrument and Wheatstone bridge is a current measuring instrument. Explain tuning of controllers Tuning basically involves adjustment of proportional.

Integral and derivative parameters to achieve good control.

The gain, time constants, and dead times around the loop will dictate the settings of various parameters of the controller. Tuning methods are broadly classified into two : 1. Closed Loop Method: e. Ultimate Gain Method 2.

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Open Loop Method: e. The single seated valve is used on smaller sizes, and in a valve of larger sizes, where an absolute shut off is required. The use of a single seated valve is limited by the pressure drop across the valve in the closed or almost closed position. What is the use of double seated valve?

It is generally used on bigger size valves and high pressure systems. Actuator forces required are less i.

What types of bonnets would you use of high temp? High temperature: Bonnets are provided with radiation fins to prevent glad packing from getting damaged. On very low temperature: Extended bonnets are used to prevent gland packing from getting freeze.

How will you work on a control valve while it is line? While the control valve is in line or in service, it has to be bypassed and secondly the line to be depressurized and drained. What is the use of a valve positioner? Quick Action control valve.

Valves used on viscous liquids. Split Range.

Instrumentation Interview Question and Answers | Instrumentation | Control Theory

Line pressure changes on valve. Valve Bench set not standard. The different types of orifice plates are: The concentric orifice plate is used for ideal liquid as well as gases and steam service. This orifice as a hole in concentric and hence known as concentric orifice.

The eccentric orifice plate has a hole eccentric. The use this is made in viscous and sherry flow measurement.

The segmental orifice place has the hole in the form segment of a circle. This is used for colloidal and sherry flow measurement.

Question 5. An orifice tab is welded on the orifice plate which extends our of the line giving an indication of the orifice plate. Question 6. The orifice tab is provided due to the following reasons: Question 7. Question 8. The marking is always done H. Question 9. The following steps are to be taken which claribrating: Question Liquid lines: On liquid lines the transmitter is mounted below the orifice plate.

Since liquids have a property of self draining. Gas Service: On gas service the transmitter is mounted above the orifice plate because Gases have a property of self venting and secondly condenlate formation.

Steam Service: On steam service the transmitter is mounted below the orifice plate with condenlate pots. The pots should be at the same level.

How Would You Start Checking? First flushing the transmitter. Flush both the impulse lines. Adjust the zero by equalizing if necessary. If still the indication is more then. Check L. If that is clean then. Check the leaks on L. If not. Calibrate the transmitter. Close one of the valve either H.

The procedure for glycol filling is: Air is vented by opening the vent plugs on a liquid service transmitter. On services where seal pots are used isolate the primary isolation valves and open the vent valves. Fill the line from the transmitter drain plug with a pump. Since this flow varies as the square root of differential pressure the pen does not directly indicate flow. The flow can be determined by taking the square root of the pen.

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Management Skills. What is remote mount with MTA option? MTA is the Connector used for connection. Generally we called it MTA Connector. Why mA signal is preferred over a V signal? Generally in a transistor some amount of voltage is required for turning it on. This voltage is the cut in voltage. Up to this voltage the exists a nonlinearity in its characteristics. Beyond this cut in voltage the char.

This nonlinear region lays between ma, beyond 4ma it linear. This is why ma range is used.

Can we use a control valve without positioner? Control valve can not be without positioner. The purpose of the positioner is to control the control valve stroke so as to keep the valve in desired position. The positioner receives signal from the controller, and send the boosted signal to the actuator to reach the desired position as and when the valve reaches the desired position the positioner cuts the boosted signal to the actuator and keeps the position.

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