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Process Control and Instrumentation

Process Control and Instrumentation
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?

>1
1
< 1
None of these

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Process Control and Instrumentation
Which is the most suitable instrument for measuring pressure below 3 microns?

Mcleoid gauge
Alphatron
Ionisation gauge
Bourdon guage

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Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer?

Nickel
30% iron + 70% nickel
Lead
Copper

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.

Volumetric expansion
Increase of pressure
Differential linear expansion
Increase of thermal conductivity

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Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Linear relation of emf to temperature
Oxidation resistance
Corrosion resistance
Non-linear relation of emf to temperature

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Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Has a slower speed of response
Can measure higher temperature
Can't measure the temperature of moving objects
Is more affected by corrosive atmosphere

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