engineering recuitment GATE IN Test Series 2023-24 Mock Test Sensors and Industrial Instrumentation Measurement of Flow Electromagnetic
An electromagnetic flow meter is used to measure the average flow rate of an effluent in a pipe of 50 mm diameter. The velocity profile is symmetrical and can be assumed uniform. The flux density in the liquid has a peak value of 0.1 wb/m2, the output from the flow meter electrodes is taken to an amplifier of gain 1000 and impedance between the electrodes is 250 kΩ. The input impedance of the meter is 250 MΩ.
The effluent average velocity when the peak to peak voltage at the amplifier output is 0.2 V is –
(assume the voltmeter resistance to be in the feedback path of the amplifier)
1
0.01 m/s
2
0.04 m/s
3
0.001 m/s
4
0.02 m/s