Given below are the answers to Infosys Fresher Aptitude 2020 Sample Question Paper Pseudocode. Comment below if you have any doubts. The full video is below for you to watch.
Sensor Manufacturing and Process Control Week 5 PID Lab Exam
Consider
the 9 scope shots labeled “Waveform 1 through Waveform 9”. Waveform 1
shows the open loop step response of the L-C circuit model, i.e., how
the output (green) looks in response to a step change in input (red)
with no feedback (Kp, Kd and Ki all zero). All waveforms use the exact
same code except for a change in one of the 4 control gains (Kp, Kd, Ki
and FF).
The PID control is implemented in the file main.c. In
all case, consider only the rising edge and settled value as circled.
Due to circuit limitations, the falling edge response cannot be
controlled properly since the input cannot go negative.
--- What was changed to the control system to create waveform 2 from waveform 1? (Concentrate on the circled areas)
the feedforward term was increased
---Consider just the initial rising step and settled value.
Compared to waveform 2, waveform 3 has:
kd set to -1000
---
What
control variable changed going from waveform 2 to 4? Notice that
waveform 4 has just slightly more overshoot and slowly settles to a
slightly lower value.
Ki
---
What control system variable would you change to smooth out the response shown in waveform 5?
kd
---What changed between waveforms 1 and 6?
FF_term was decreased
--- Question 6
Waveform 7 shows two waveforms overlaid on each other. Only one control system variable changed between the two. Which one?
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