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Process Control and Instrumentation

Process Control and Instrumentation
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Helium
Nitrogen
None of these
Hydrogen

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

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

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Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

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

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Process Control and Instrumentation
Which of the following thermocouples has the widest temperature measurement range?

Chromel-alumel
Iron-constantan
Copper-constantan
Platinum-platinum/rhodium

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 90° at the most
Is 30°
Is 120°
Approaches 180° asymptotically

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Process Control and Instrumentation
Which of the following thermocouples can measure the maximum temperature?

Tungsten-molybdenum
Chromel-alumel
Iron-constantan
Platinum-rhodium

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