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Process Control and Instrumentation

Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

Viscosity
All of these
Pressure
Volume

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

0.5
0.25
1
1/√2

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Process Control and Instrumentation
On-off controllers are normally used for

None of these
Low loads
Flow rate changes
Temperature changes

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Radiation pyrometer
Bimetallic thermometer
Mercury thermometer
Thermocouple

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

None of these
Bode stability
Nyquist
Routh stability

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Process Control and Instrumentation
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

Chromel-constantan
Iron-constantan
Platinum-platinum + rhodium
All of these

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