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Process Control and Instrumentation

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

10
-20
-10
20

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Process Control and Instrumentation
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an

Chromel-alumel thermocouple
Either B or C
Radiation pyrometer
Optical pyrometer

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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

Mercury thermometer
Bimetallic thermometer
Dilatometer
Beckman thermometer

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

None of these
Bode stability
Nyquist
Routh stability

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Process Control and Instrumentation
Which of the following fluid flow measuring devices can measure the largest flow rate?

Rotameter
V-notch
Weir
Orificemeter

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of a __________ is 1.

None of these
Second order system
First order system
Transportation lag

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