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Process Control and Instrumentation

Process Control and Instrumentation
Psychrometer determines the

Humidity of gases
Hygroscopic nature of solids
Moisture content of solids
Water of crystallisation

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Process Control and Instrumentation
Flow rate of sludge is not measured by a/an

Open weir
Kennison nozzle
Both B & C
Orificemeter

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

Bimetallic thermometer
Mercury thermometer
Thermocouple
Radiation pyrometer

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Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

None of these
Dead zone
Drift
Static error

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Process Control and Instrumentation
High temperature of around 2000°C of incandescent gas mantles is measured by a/an

Radiation pyrometer
None of these Here
Specially designed thermocouple
Optical pyrometer

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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

90°
45°
180°
0°

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