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Process Control and Instrumentation

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°
90°
0°
45°

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Process Control and Instrumentation
Liquid discharge from a tank or reservoir can not be measured by

Notches
Orificemeters
Weirs
Mouthpieces

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Process Control and Instrumentation
__________ are analysed using a polarograph.

Solids
Liquids
Gases
Isotonic solutions

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Process Control and Instrumentation
Pick out the first order system from among the following.

Non-interacting system of two tanks in series
Mercury in glass thermometer kept in boiling water
Interacting system of two tanks in series
Damped vibrator

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Process Control and Instrumentation
Dilatometer is used to measure

Stress
Deflection
Contraction/expansion due to changes in temperature
Strain

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Process Control and Instrumentation
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Nickel
Brass
Chromel
Invar

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