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Process Control and Instrumentation

Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

Routh test
Frequency response methods
None of these
Root locus methods

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Process Control and Instrumentation
A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same

Speed of response
All of these
Temperature measuring range (- 40°C to 450°C)
Accuracy (± 1% of span)

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Process Control and Instrumentation
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

Platinum-platinum + rhodium
All of these
Chromel-constantan
Iron-constantan

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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
Hyperbolic
Linear
Non-linear

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Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

R + C
1/RC
R - C
RC

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Process Control and Instrumentation
Routh stability method uses __________ loop transfer function.

Either A or B
Open
Neither A nor B
Closed

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