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Process Control and Instrumentation

Process Control and Instrumentation
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'

Rankine
Farenhite
Celcius
Reumur

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Iron-constantan
Either A, B or C
Platinum-platinum+rhodium
Chromel-alumel

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Process Control and Instrumentation
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

All of these
Platinum-platinum + rhodium
Iron-constantan
Chromel-constantan

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Process Control and Instrumentation
The operation of a rotameter is based on

Pressure at a stagnation point
Pressure drop across a nozzle
Rotation of a turbine
Variable flow area

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Process Control and Instrumentation
What is the Laplace transform of sin t ?

S/(s² + 1)
1/(s² + 1)
1/(s² - 1)
S/(s² - 1)

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

None of these
Stable
Unstable
Critically damped

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