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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
Mercury thermometer
Dilatometer
Bimetallic thermometer

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Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

Platinum-platinum+rhodium
None of these
Aluminium-chromel
Copper-constantan

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Process Control and Instrumentation
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is

3
1
5
2

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Process Control and Instrumentation
In second order underdamped system,

Overshoot increases for increasing damping co-efficient
Decay ratio = overshoot
Large damping co-efficient means smaller damping
Decay ratio = (overshoot)²

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Process Control and Instrumentation
A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same

Speed of response
Accuracy (± 1% of span)
All of these
Temperature measuring range (- 40°C to 450°C)

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

Platinum-rhodium
Iron-constantan
Platinum-platinum+rhyodium
Chromel-alumel

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