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Process Control and Instrumentation

Process Control and Instrumentation
Bimetal strips are not used in

Thermocouples
Relays for opening & closing of electrical circuits
Thermostats
Bimetallic thermometers

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.

Increase of pressure
Differential linear expansion
Volumetric expansion
Increase of thermal conductivity

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Process Control and Instrumentation
Flow rate of a river is measured by a/an

Kennison nozzle
Pitot tube
Open weir
Vane meter

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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.

0.0001
0.01
0.1
0.001

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Process Control and Instrumentation
The second order system with the transfer function 4/(S² + 2S + 4) has a damping ratio of

0.5
2.0
4.0
1.0

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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

4
3
2
1

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