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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is an undesirable dynamic characteristic of an instrument?

Static error
Reproducibility
Time lag
Dead zone

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

Iron-constantan
Chromel-alumel
Platinum-platinum+rhodium
None of these

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Process Control and Instrumentation
In Bode plot, Φ vs ω is plotted on a/an __________ graph paper.

Log-log
Triangular
Ordinary
Semi-log

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Process Control and Instrumentation
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

High viscosity index
Low electrical conductivity
Low flash point
Low thermal conductivity

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Process Control and Instrumentation
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Increases exponentially
Decreases
Remains constant
Increases

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Process Control and Instrumentation
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing

None of these
Helium
Nitrogen
Hydrogen

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