3.1 a) Electromagnetic flow meter

1. A magnetic flow meter will not properly measure the flow rate of:

• Dirty water

• Milk

• Oil

• caustic

2. The output signal or reading of a magnetic flow meter is:

• Proportional to volumetric flow rate

• Proportional to the square of volumetric flow rate

• Proportional to the square root of volumetric flow rate

• Inversely proportional to volumetric flow rate

3. With suspended solids and/or entrapped gas in a flowing liquid, the magnetic flow meter will:

• Read high

• Read low

• Read the liquid flow only

• Read the correct total volume of the mixture

4. Servo operated electromagnetic flow meter is ______

• First order system

• Zero order system

• Third order system

• Second order system

5.Which for the following represents conditions for maximum emf?

• Electrodes parallel to flow

• Electrodes across flow

• Electrodes parallel to pipe length

• None of the answer

6. Output signal of electromagnetic flow meter inversely proportional to _________

• Velocity of flow

• Magnetic flux density

• Diameter of tube

• None of the above

7.Electromagnetic flow meter is based on _______

• Coulomb’s law

• Law of electromagnetic induction

• Kirchoff’s law

• Newton’s law

8. The voltage across electrodes in the electromagnetic flow meter is directly proportional to

• Diameter of non-metallic pipe

• Diameter of electrode

• Velocity of fluid

• All the above

9. Which type of excitation system is used for flow measurement of mercury in the electromagnetic flow meter?

• AC

• DC

• Both of the above

• None of the above

10. Feedback system in electromagnetic flow meter is applied to ______

• Overcome fluctuation of B

• Reduce excitation supply

• Reduce measuring time

• None of the answers