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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is not a variable area flow meter?

Orifice and tapered plug meter
Magnetic flow meter
Piston type meter
Rotameter

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Process Control and Instrumentation
Thermocouple is suitable for measuring

Liquid temperatures only
Very low temperatures only
Very high temperatures only
Both high and low temperatures

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Process Control and Instrumentation
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

Turbine flowmeter
Pitot tube
Flow nozzle type flowmeter
Magnetic flowmeter

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Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

Static error
Drift
None of these
Dead zone

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Grows linearly with time
Grows exponentially with time
Is a constant
Decays linearly with time

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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?

NO
NO₂
CO₂
O₂

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