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Process Control and Instrumentation

Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.001
0.0001
0.1
0.01

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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.

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

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Process Control and Instrumentation
Which of the following does not figure in the list of seven substances selected for international temperature scale?

Antimony and silver (F.P)
Ice (F.P) and steam (B.P)
Zinc (B.P) and mercury (F.P)
Oxygen and sulphur (B.P)

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Process Control and Instrumentation
The second order system with the transfer function 4/(S² + 2S + 4) has a damping ratio of

4.0
1.0
2.0
0.5

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Is unstable
Has a damped oscillatory characteristics
Is overdamped
Has a non-zero slope at the origin

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Process Control and Instrumentation
Which of the following is the dynamic characteristics of an instrument?

Dead zone
Sensitivity
Reproducibility
Fidelity

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