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Process Control and Instrumentation

Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

1/√2
0.25
1
0.5

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Process Control and Instrumentation
A simple pitot tube measures the

Static pressure
Maximum velocity
Point velocity
Average velocity

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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?

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

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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

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

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Process Control and Instrumentation
A system with transfer function (2S/4S) + 1 is of __________ order.

Zero
1st
2nd
3rd

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Process Control and Instrumentation
Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

Joule heating effect
Peltier effect
Thomson effect
Seebeck effect

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