Interview Questions.

Question 1. What Is ‘volumetric’ And ‘charge Of Flow’? Write Their Measuring Units In Metric?

Answer :

Volumetric Flow: The total quantity of fluid surpassed thru a system line. Generally it's far measured on counters. The measuring unit is cubic meter, Barrels…and so forth.

Rate of drift: The quantity of fluid shifting thru a manner line according to period of time. Generally it is measured on signs, recorders. The measuring unit is cubic meter consistent with day, barrels in keeping with day…and many others.

Question 2. What Are The Types Of Flow; Measuring Instruments Used In Industries?

Answer :

Orifice plate and a DP transmitter, Daniel orifice and DP transmitter, Rota meter, Dell Tube, Ventura Tube, PD meters…and so on.

Civil Engineering Interview Questions
Question three. What Are The Types Of Flow Measurements Commonly Used In Dpu-a?

Answer :

Orifice plate and a DP transmitter, Daniel Orifice and a DP Transmitter, Rota meter, PD meters.

Question 4. What Is ‘burnollious Theorem’? What Does It Explain?

Answer :

It explains that once there may be a limit line a fluid waft line a ‘DP’ (differential stress) is created. The DP is maximum at the Veena settlement point. The waft measured within the drift line is proportional to the square root of the DP measured wherein ‘K’ is a regular.

                                                Q= k  6(sq.Root of (DP))

Question 5. What Is The Function Of An Orifice Plate In Flow Measurement?

Answer :

An orifice plate creates a differential strain in a drift line. The DP created is find for measuring the go with the flow thru the technique line.

Mechanical Engineering Interview Questions
Question 6. How Much Maximum And Minimum Orifice‘d’ (orifice Diameter) Id Permitted In A Pipeline?

Answer :

                              0.25 D<d<0.Seventy five D

‘d’ – the Orifice diameter need to be in-between zero.25 and 0.Seventy five of the pipeline ‘D’ diameter.

Question 7. What Is The Difference Between An Orifice Plate Used In Oil And Gas Flow Measurement?

Answer :

The orifice plate used in a fuel line will be having a small drain entire at the lowest of the orifice plate.

Question 8. How To Identify A Newly Installed Orifice Plate Upstream In A Pipeline?

Answer :

The upstream can be recognized by way of the orifice plate Tag wide variety markings. Tag numbers are always marked at the upstream of the orifice plate.

Question nine. How Much Upstream And Downstream Straight Length Run Is Essential For An Orifice Plate Flow Measurement?

Answer :

An upstream of 28D and a down steam of minimal 7D is critical for an accurate orifice plate float measuring device (in which D= pipe line diameter). Greater the upstream and downstream duration, lesser the go with the flow turbulence and greater the accuracy inside the go with the flow size.

Question 10. What Type Of Orifice Tapping Is Commonly Used In P.D.O.?

Answer :

PDO in general, is the use of the ‘Flange Tapping’. The upstream and downstream orifice tapping are taken from the flanges.

Question eleven. Why And When Is Flow Measured On A Square Root Scale?

Answer :

Flow is measured on a rectangular root scale best whilst the size is achieved thru an orifice plate and a DP transmitter. The drift measured via the orifice plate is constantly proportional to the square root of the DP across the orifice plate.

                                   Q = okay 6 sq.Root of DP

                                    Q = Flow

                                    K = Constant

                                    DP = Differential Pressure

Question 12. What Is A ‘flow Factor’?

Answer :

A ‘waft component’ is to multiply the drift transmitter sign measured on a 0-10 rectangular root or 0-100 linear scale to get the go with the flow calculated by way of go with the flow metering. This is used due to the standardization of the transmitter’s alerts, to twenty-100 kPa or four-20mA.

Civil Engineering Interview Questions
Question thirteen. Explain The Installation Of A Dp Flow Transmitter On A Gas And Liquid Pipeline?

Answer :

Gas line: the transmitter is installed above the orifice plate to save you the condensation of gas inside the sign line and in the HP & LP chambers.

Liquid line: the transmitter is mounted under the orifice plate to save you the gasoline trapping within the signal line and in the HP & LP chambers.

Question 14. What Is A ‘zero Check’ And ‘static Zero Check’ On A Dp Flow Transmitter?

Answer :

Zero Check:  A process for checking the transmitter output is identical to four.00 mA whilst its HP & LP chambers are equalized and are on the atmospheric stress.

Static Zero Check: A process for checking the transmitter output is same to 4.00 mA when its HP & LP chambers are equalized and are on the working strain.

Question 15. Why Is Flow Measurement Not Very Accurate?

Answer :

Flow dimension is less correct in comparison to stage, temperature and strain measurement. This is due to the attention of numerous parameters even as measuring a float. These parameters, which include the accuracy of the orifice plate diameter, the pipeline diameter their operating parameters such as temperature and stress do now not stay equal in the system operation as the design parameters. Generally, an accuracy of five% is allowed in a waft size.

Question 16. What Is The Actual Flow, If The Operating Pressure Is Higher Than The Designed Pressure?

Answer :

If the operating pressure is better than the designed pressure the true float might be higher then the measured pressure. A simple calculation is as follows.

                                    Q = Q1* squareroot of p1/p2

                                    Q = True Flow

                                    Q1= Measured Flow

                                    P1= Operating strain

                                    P2= Designed Pressure

Question 17. What Will Be The New Flow Factor If A Dp Transmitter Is Re-ranged From 25 Kpa To 50 Kpa?

Answer :

A simple calculation is as follows:

            Q1/Q2 = Sq root of DP1/ Sq root of DP2

            Q1 = Q2 * Sq root of DP1/ Sq root of DP2

Q1       = New waft element,    Q2       =Existing glide thing

DP1    = Transmitter new variety, DP2= Transmitter present range

                        Q1 = Q2*SQ ROOT OF 50/25

                        Q1 = 1.41*Q2

The new go with the flow thing might be 1.Forty one instances higher than the present flow element.

Question 18. Why Generally Is A Flow Transmitter Installed Upstream Of A Flow Control Valve?

Answer :

A go with the flow transmitter is usually established at the upstream of the float manipulate valve with the intention to hold the running stress across the drift transmitter sensors. Downstream of the manage valve the strain modifications as the manage valve open or closes.

Mechanical Engineering Interview Questions
Question 19. Why Is A Pressure Transmitter Installed Upstream Of A Flow Transmitter?

Answer :

Upstream of a flow manipulate valve a strain transmitter is installed to degree the running stress. At times it is used for computing the actual float against the designed pressure. Downstream of the manipulate valve the stress changes as the control valve open and closes.

Question 20. What Is The Operating Principle Of A Turbine Meter?

Answer :

A magnetic pickup installed above a turbine meter measures the number of magnetic flux cut through the turbine meter blades and produces pulses proportional to the extent of liquid go with the flow thru the meter.

Question 21. What Is The Output Of A Turbine Meter?

Answer :

The output of the turbine meter is in pulses. The pulse in step with the volume of liquid is consistent and distinct for every meter. When a regarded quantity of liquid flows thru the meter, a known number of pulses are produced.

Question 22. What Does A Pre-amplifier Do On A Turbine Meter?

Answer :

The magnetic pickup inside the turbine meter produces pulses around 30 mv peak to height. A pre-amplifier magnifies the small sign to a 12 V DC peak to top rectangular waves and transmits a sign to the manage room.

Question 23. What Are The Advantages And Disadvantages Of A Turbine Meter Vs An Orifice Plate Flow Measurement?

Answer :

Turbine meter is a great float measuring unit while the fluid is low clean fluid. The turbine meter measures the volumetric flow. It is directly mounted on the flow line. Its accuracy in flow measurement is excessive. Accuracy can be re-calculated and the ‘ok’ factor can be reset periodically.

Question 24. What Is A ‘ok’ Factor On A Turbine Meter? Who Provides The ‘k’ Factor?

Answer :

Each turbine meter is particular with a ’okay’ issue which represents the variety of pulses produced per a known quantity of liquid.

Example:       ok = 265 pulsed/gallon

Generally the ‘ok’ element is supplied through the producer.

Question 25. One Cubic Meter Is Equal To How Many Gallons?

Answer :

1 Cubic Meter = 264.2 gallons.

Question 26. Why Are Counters (totalize) Used In Flow Measurement?

Answer :

Counters are used for measuring the ‘volumetric glide’ of the fluid in a pipeline.