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Process Control and Instrumentation

Process Control and Instrumentation
The fluid used in hydraulic controller is

Steam
Air
Water
Oil

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Process Control and Instrumentation
Mercury manometer (U-tube type) exemplifies a __________ order system.

Second
Third
First
Zero

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

Thermocouple
Mercury thermometer
Radiation pyrometer
Bimetallic thermometer

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Process Control and Instrumentation
Process degree of freedom indicates __________ number of controllers to be used.

Both maximum and the minimum
Nothing about the
The minimum
The maximum

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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

180°
0°
90°
45°

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Process Control and Instrumentation
Which of the following measurements can be made by the measurement of emf?

Composition of complex ions
PH value
All of these
Degree of hydrolysis

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