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Process Control and Instrumentation

Process Control and Instrumentation
The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is

1
43832
2

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Process Control and Instrumentation
When the damping co-efficient (ξ) is unity, the system is

Critically damped
Underdamped
Overdamped
Highly fluctuating

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Is overdamped
Is unstable
Has a non-zero slope at the origin
Has a damped oscillatory characteristics

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Process Control and Instrumentation
Gain margin is equal to the

Reciprocal of amplitude ratio
Gain in P-I controller
Amplitude ratio
Gain in P controller

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Process Control and Instrumentation
Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

Carbon dioxide in
Oxygen in
Carbon monoxide in
Temperature of

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

> 3
< 1
< 0.1
< 3

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