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H1081 Pages: 2

Derive an expression for the output voltage of a logarithmic amplifier and show
that it is proportional to logarithm of input voltage.
Explain the concept of graphical programming in virtual instruments

PART D

Answer any two full questions, each carries 10 marks.

What is the role of actuators in automation system? How they are classified?
How can you convert an open loop system to an automatic system? Explain
with the help of an example.
Draw the PLC ladder diagrams to realize two input AND, OR and XOR gates
What are the main components of SCADA?
With the help of a neat diagram explain the working of butterfly valve.

Give the significance of timers and counters in PLC.

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