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Process Control and Instrumentation

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

1
3
2
4

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Process Control and Instrumentation
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is

2
5
1
3

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Process Control and Instrumentation
A pyranometer is an instrument used for measuring the

Global radiation
Bright sunshine period
Beam radiation
None of these

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of a __________ is 1.

Transportation lag
Second order system
First order system
None of these

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Process Control and Instrumentation
Cascade control means

Feed forward control
More than one feed-back loop
One feed-back loop
On-off control

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Process Control and Instrumentation
Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

Vapor pressure thermometer
Reistance thermometer
Mercury in glass thermometer
Thermocouple

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