 # What are the Interview Questions on Flow Measurement Devices?

Here is the list of different Interview Questions on Flow Measurement Devices or on flow measurement.

## Flow Measurement Devices

1. List the different units of flow.

2. Define mass flow rate.

3. What is meant by variable area flow meter ?

4. Water is pumped through a 150 mm diameter pipe with a flow velocity of 3.5 m/sec. Find
the volume flow rate and the weight flow rate. The density of water is 1000 kg/m3.

5. An incompressible fluid is flowing through an orifice plate with a flow coefficient of 0.5,
causing a pressure drop of 500 mm. Calculate the fluid velocity.

6. Explain the flow measurement by orifice plate with the help of a sketch giving the installation details.

7. Does the venacontracta position change in fluid flow line with change in fluid flow rate ?

8. When is a Venturi tube preferable to orifice plate ?

9. A pitot tube with coefficient of 0.93 is used to measure the velocity of air in a pipe. The
measured differential pressure is 300 mm. What is the velocity of air in the pipe ?

10. Explain the advantages and disadvantages of the three main types of orifice plates.

11. Discuss the basic principle used in positive-displacement flow meters to measure fluid
flow.

12. An incompressible fluid is flowing in a 100 mm pipe under a pressure head of 1.5 kg/
cm2. Calculate the fluid velocity and volume flow rate.

13. Explain in detail the operation of rotary-vane, oval-gear and nutating disk PD flow
meters.

14. What is meant by inferential flow meters ?

15. What are the types of inferential flow meters ?

16. Explain about target flow meters.

17. What is the principle of turbine flow meter ?

18. Does the operation of the turbine flow meter depend on liquid characteristics ?

19. Will you recommend DC supply to the electromagnet of a magnetic flow meter
carrying mercury ?

20. Which flow meters are preferable for the measurement of flow of corrosive liquids ?

21. What is the concept of cross-correlation flow meter ?

22. How will you measure the flow rate of solids ?

23. An incompressible fluid is flowing in a 300 mm pipe under a pressure head of 2.5 kg/
cm2. Calculate the fluid velocity and volume flow rate.

24. How will you measure the mass flow rate ?

25. What are the types of mass flow meters ?

26. State the features of ‘coriolis’ mass flow meters.

27. What is ‘Vortex’ ?

28. What is a flow switch ?

29. What are the types of flow switches ?

30. What is the principle of hot-wire anemometers ?

31. Explain the two types of hot wire anemometers.

32. Explain the types of mechanical anemometers.

33. Explain the principle of thermal mass flow meters.

34. Explain the excitation schemes of an electro magnetic flow meter.

35. Explain the principle of operations of an electromagnetic flow meter. Discuss its merits.

36. In an ultrasonic flow meter, the beat frequency is 805 cps, the angle (θ) between the
transmitters and receivers is 45°, and the sound path is 125 mm. Calculate the fluid
velocity in m/sec.

37. Which type of flow meter can be used to calibrate other flow meters ?

38. State the types of calibration methods available for gas flow measurement.

39. Write short notes on flow regulators.

40. Briefly explain about the selection of a flow meter

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