Question

1. If you know the measured electrical voltage and the cross-sectional area of the pipe/tube you can determine the volume? T/F

2. In order to use the electromagnetic type of meter what kind of fluid must be flowing through the meter in order to induce an electrical voltage between the electrodes? T/F

3. By increasing the cross-sectional area of the restriction, one can significantly increase the flow velocity. T/F

4. The higher the flow velocity and the resulting pressure drop around the restriction, the greater the differential pressure measured by the sensor. T/F

5. Using a Coriolis meter is the only way the particular X of mass flow, density, volume flow, and flow velocity can be measured simultaneously.

a. Process Variables

b. Measurements

c. Phases

d. Process technique

6. When sensors in this kind of flow meter sense a change in tube oscillation what is this phenomena called?

7.The frequency of the changing zones of pressure corresponds to the X of passing vortices.

8. Total flow can be calculated since the distance between two consecutive vortices corresponds to a defined volume.

9. The differential transit times of the signals going upstream and downstream is a direct measure of (X).

10. When there is no flow, the signal transit times between ultrasonic sensor pairs are X upstream and downstream.

a. Not Applicable

b. same

c. different

11. Thermal meters use principles of X in order to determine various flow process variables

a. fluid dynamics

b. heat generation

c. heat transfer

d. thermodynamics

12. The amount of energy required to maintain the desired temperature difference is proportional to the cooling effect, and therefore, it is a direct measure of the mass flow rate. T/F

13. It is critical to the measurement that any flow meter is installed in such a manner that is kept full of fluid at all times. T/F

14. Laminar flow is the most desirable for flow measurements in pipes T/F

15. ________occurs when piping systems contain bends in multiple directions in succession.

Answer 1

1) True.

Electromagnetic flowmeters follow Faraday's law, which is given by;

e=Blv (1)

where, e= induced emf, B=magnetic field(Wb/m²), l=length of the conductor(m) and v=velocity of the conductor(m/s).

The volume flow rate, Q=(d²/4)v (2)

where, d=diameter of the pipe, v= average velocity of flow

From equation (1), v=e/Bl (3)

Putting this value of (3) in (2), we get,

Q=d²e/4Bl

or Q=Ke

where, K=meter constant.

2) Conductive liquid must be flowing through the meter in order to induce an electrical voltage between the electrodes.

3) True.

4) True. Since, the pressure difference is directly proportional to the flow velocity and to the mass and volume flow in the pipe; higher the flow velocity and the resulting drop in pressure around the orifice plate,the greater the differential pressure measured.

5) a) Process Variables

6) Coriolis mass flow meters work on Coriolis effect/ Coriolis Force.

7) Velocity

8) True

9) Flowing velocity

10) b. Same

11) c. Heat transfer

12) True

13) True. It should be kept full since the gas/vapor in the flowmeter can alter it's geometry and affect it's accuracy

14) False

15) Pressure loss