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Process Control and Instrumentation

Process Control and Instrumentation
Degree to which an instrument indicates the changes in measured variable without dynamic error is called its

Fidielity
Speed of response
Static characteristics
Reproducibility

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Process Control and Instrumentation
Which of the following fluid flow measuring devices can measure the largest flow rate?

Orificemeter
Weir
V-notch
Rotameter

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

0.25
1
1/√2
0.5

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Process Control and Instrumentation
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

PH meter
Chromatograph
Polarimeter
Polarograph

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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
Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

Water
Carbon tetrachloride
Ethylene glycol
Paraffin

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