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Process Control and Instrumentation

Process Control and Instrumentation
Working principle of disappearing filament type optical pyrometer is based on the

Peltier effect
Seebeck effect
Wien's law
Kirchoff's law

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Process Control and Instrumentation
In second order underdamped system,

Decay ratio = (overshoot)²
Decay ratio = overshoot
Large damping co-efficient means smaller damping
Overshoot increases for increasing damping co-efficient

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Process Control and Instrumentation
The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be

Under damped
Critically damped
None of these
Over damped

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Process Control and Instrumentation
Phase lag of the sinusoidal response of a first order system is

90°
180°
30°
120°

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Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

0°
45°
180°
90°

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Process Control and Instrumentation
Measurement of sub-zero Celcius temperature in industry is done most commonly by

Gas thermometers
Thermocouples
Bi-metallic thermometers
Resistance thermometers

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