1)How would you calibrate a vacuum pressure sensor – draw out a picture and use
ID: 2084647 • Letter: 1
Question
1)How would you calibrate a vacuum pressure sensor – draw out a picture and use real devices (Name and model number) in your answer.
2)Name at least 4 ways to measure flow?
3)How many pulses does it take to rotate the Stepper Motor you used in your labs 33.5 degrees?
4)Show a diagram or an oscilloscope capture of the signals required to step the motor.
5)Explain the difference between a time domain signal and a frequency domain signal.
6)When would you select the frequency domain signal over the time domain signal.
7) Why do we use a PID controller?
8) In a control system the safety loop should be (part of) or (external to) the main control loop?
9) Make a simple drawing, which shows stable, unstable and neutral conditions.
10) Discuss the concept of an alias signal and how do we prevent this from occurring.
11) Given (s-3)/(s+5) as the transfer function of a system is it stable, plot the poles and zeros.
12) Describe and provide a sketch that shows how the stepper motor controller you used works.
13) The level in a tank is two feet below the sensors for a liquid level sensor the angle of the sensors is 38 degrees show the calculations and results, which support this measurement.
typ the answer :)
Explanation / Answer
2) Four ways to measure flow
- using force displacement
- using ultrasonic method
- using velocity of the flow
-using differential pressure
7)
A PID controller is used because
A proportional controller may not give SSE performance needed in a system. An integral controller may give SSE performance, but slow a system down. In such cases adding a derivative term may help to eradicate both of these problems.
8) In a control system, safety loop should be external to main control loop
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