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Process Control and Instrumentation

Process Control and Instrumentation
For an input forcing function, X(t) = 2t², the Laplace transform of this function is

2/s³
2/s²
4/s²
4/s³

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Process Control and Instrumentation
Pirani gauge is used for the measurement of

Liquid level at atmospheric pressure
High vacuum
Liquid level under pressure
Very high pressure

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Process Control and Instrumentation
A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

-80.9
-38.9
-11.9
-60.9

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Process Control and Instrumentation
Bode diagram is a plot of

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

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Process Control and Instrumentation
In second order underdamped system,

Overshoot increases for increasing damping co-efficient
Large damping co-efficient means smaller damping
Decay ratio = overshoot
Decay ratio = (overshoot)²

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Process Control and Instrumentation
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

NO₂
NO
O₂
CO₂

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