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Process Control and Instrumentation

Process Control and Instrumentation
Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a

Beckman thermometer
Dilatometer
Mercury thermometer
Bimetallic thermometer

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Process Control and Instrumentation
Optical activity of a solution can be determined using a

Polarograph
Dilatometer
Polarimeter
Refractrometer

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

-10
20
-20
10

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Process Control and Instrumentation
Which of the following flow-metering instru-ments is an areameter?

Hot wire anemometer
Pitot tube
Venturimeter
Rotameter

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Process Control and Instrumentation
Dead zone is the

Same as time constant
Same as transportation lag
Maximum change in the variable that does not change the reading of the instrument
None of these

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

Critically damped
Unstable
None of these
Stable

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