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Process Control and Instrumentation

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

4.0
2.0
1.0
0.5

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Process Control and Instrumentation
Emission spectroscopy is used for

Solids and metal analysis
Determining water purity
Determination of CO₂ in gases
NOxdetermination

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Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

π/6
5π/12
π/12
π/3

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Process Control and Instrumentation
Gain margin is equal to the

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

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Process Control and Instrumentation
A typical example of a physical system with under damped characteristic is a

Thermocouple kept immersed in a liquid filled thermowell
CSTR with first order reaction
U-tube manometer
Spring loaded diaphragm valve

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Process Control and Instrumentation
Pick out the first order system from among the following.

Interacting system of two tanks in series
Damped vibrator
Non-interacting system of two tanks in series
Mercury in glass thermometer kept in boiling water

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