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Process Control and Instrumentation

Process Control and Instrumentation
Out of the following themocouple wire insulating material, the highest temperature rating is for

Ceramic fibre
Teflon
Asbestos
Fibre glass

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Process Control and Instrumentation
Specific gravity of a liquid can not be measured by a/an

Hydrometer
Pycnometer
Specific gravity bottle
Anemometer

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Process Control and Instrumentation
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K(s + 1)/2(2s + 1)(3s + 1) will have a definite number of loci for variation of K from 0 to ∞. The number of loci is

3
4
2
1

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Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Difference
Ratio
Sum
Product

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

100
87.5
63.2
95

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Process Control and Instrumentation
Instrumentation in a plant offers the advantage of

Greater safety of operation
All of these
Greater operation economy
Better quality of product

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