Process Control and Instrumentation
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

Increase
Exponential decrease
Decrease
No change

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Process Control and Instrumentation
For a feed back control system to be stable, the

Poles of the closed loop transfer function should lie in the right half of the complex plane
Roots of the characteristic equation should be real
Poles of the closed loop transfer function should lie in the left half of the complex plane
Bode plots of the corresponding open loop transfer function should monotoni-cally decrease

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