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Process Control and Instrumentation

Process Control and Instrumentation
Continuous measurement of specific gravity of a liquid is done by

Displacement meter
Contact-type electric indicators
Hydrometer
Both A and C

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Process Control and Instrumentation
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

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

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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
1
2
3

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Process Control and Instrumentation
Identify an unbounded input from inputs whose transfer functions are given below

1/S²
1/(S² + 1)
1/S
1

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Process Control and Instrumentation
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.

Seebeck
None of these
Thomson
Peltier

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Process Control and Instrumentation
__________ stability method uses open loop transfer function.

Ruth
None of these
Mikhalov
Nyquist

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