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Process Control and Instrumentation

Process Control and Instrumentation
Continuous measurement of moisture in paper is done by

Hair-hygrometer
Sling psychrometer
Weighing
High resistance Wheatstone's bridge circuit

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Process Control and Instrumentation
Which of the systems having following transfer functions is stable?

1/(s²+ 2)
Exp(-20s)/(s² + 2s-l)
1/(s² + 2s + 2)
1/(s²-2s + 3)

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Process Control and Instrumentation
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

Parabolic
Non-linear
Linear
Hyperbolic

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is

None of these
Pressure rise with temperature
Linear expansion
Volumetric expansion

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

< 0.1
< 1
> 3
< 3

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Process Control and Instrumentation
__________ is the static characteristics of an instrument,

Response
Dynamic error
Drift
Tine lag

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