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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is not a composition measuring instrument?

Thermal conductivity cell
Polarograph
Mass spectrometer
Hot wire anemometer

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

< 1
< 0.1
> 3
< 3

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

None of these
Routh stability
Bode stability
Nyquist

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Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Dielectrics
Semi conductors
Insulators
Conductors

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Process Control and Instrumentation
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?

√AT
2 AT
1.5 AT
0.5 AT

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Process Control and Instrumentation
The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is

43832
2
1

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