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Process Control and Instrumentation

Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

Critically damped
None of these
Stable
Unstable

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

Reproducibility
Dead zone
Fidelity
Sensitivity

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Process Control and Instrumentation
Bode diagram is a plot of

Log (AR) vs. log (f) and (Φ) vs. log (f)
AR vs. log (f) and Φ vs. log (f)
None of these
Log (AR) vs. f and log Φ vs.f

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Mercury thermometer
Thermocouple
Bimetallic thermometer
Radiation pyrometer

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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 derivative control
Introducing integral control
None of these

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Platinum-platinum+rhodium
Either A, B or C
Chromel-alumel
Iron-constantan

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