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Process Control and Instrumentation

Process Control and Instrumentation
Pirani gauge is used for the measurement of

Liquid level at atmospheric pressure
Very high pressure
High vacuum
Liquid level under pressure

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Process Control and Instrumentation
Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.

> 0
> 800
< 0
< 100

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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
Stability of a control system containing a transportation lag can be best analysed by

None of these
Frequency response methods
Root locus methods
Routh test

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

1/(τds + 1)
E-τds
Eτds
Τds + 1

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

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

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