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Process Control and Instrumentation

Process Control and Instrumentation
Reset rate is the another term used for __________ time.

Integral
None of these
Derivative
Dead

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Process Control and Instrumentation
__________ is an example of distributed parameter system

Tubular reactor
None of these
On-off controller
CSTR

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

G/(1 + H)
G/H
H(1 + G)
H/G

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Process Control and Instrumentation
Nichol's chart deals with

R. vs. phase lag of second order
R. vs. phase lag of first order
Closed loop values vs. open loop values
Frequency response values of controllers

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

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

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Process Control and Instrumentation
In second order underdamped system,

Overshoot increases for increasing damping co-efficient
Decay ratio = (overshoot)²
Decay ratio = overshoot
Large damping co-efficient means smaller damping

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