Flow Rate, Rotating Speed and Error Voltage
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44. You have installed into a water pipe a turbine flow sensor that has a calibration factor of 60 pulses/gallon. When water is flowing in the pipe the sensor outputs 470 pulses/minute. What is the flow rate in gallons/minute?
a. 0.1218
b. 7.83
c. 470
d. 28,200
45. A slotted disk and opto-interrupter outputs pulses at 62 Hz. The disk has only one slot cut in it. What is the rotating speed of the disk in rpm?
a. 1.033
b. 62
c. 3,720
d. 223,200
46. In a closed loop system the process variable PV is 1.7 volts and the setpoint SP is 3.7 volts. What is the error voltage?
a. 0.66V
b. 1.51V
c. 2.00V
d. 9.30V
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Solution Summary
This solution shows step-by-step calculations with brief explanations to determine the flow rate of the water pipe, rotating speed of the disk and also error voltage of the closed loop system. All workings are shown with equations of flow rate, frequency and error voltage.
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