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Process Control and Instrumentation

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

0.5
2.0
4.0
1.0

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Air
Oil
Mercury
A metal powder or graphite

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Process Control and Instrumentation
Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a

Dilatometer
Mercury thermometer
Bimetallic thermometer
Beckman thermometer

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Process Control and Instrumentation
Platinum resistance thermometer can be used upto antimony point which is __________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.

1261.93
961.93
630.74
1064.43

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Process Control and Instrumentation
Bourdon tube is never made of

Cast iron
Monel metal
Phosphor bronze
Stainless steel

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Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by

Reducing value of Kc
Introducing integral control
Introducing derivative control
None of these

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