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Process Control and Instrumentation

Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

Iron-constantan
Chromel-alumel
Platinum-platinum+rhodium
None of these

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Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Becomes less oscillatory (frequency decreases)
Becomes more oscillatory (frequency increases)
Gets amplified (magnitude increases)
Gets attenuated (magnitude decreases)

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Process Control and Instrumentation
Dead zone is the

None of these
Maximum change in the variable that does not change the reading of the instrument
Same as transportation lag
Same as time constant

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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

Pitot tube
Turbine flowmeter
Flow nozzle type flowmeter
Magnetic flowmeter

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Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

Poor reproducibility
High drift
High fidelity
High measuring lag

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Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.01
0.001
0.0001
0.1

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