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Process Control and Instrumentation

Process Control and Instrumentation
Emission spectroscopy is used for

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

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Process Control and Instrumentation
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an

Optical pyrometer
Chromel-alumel thermocouple
Radiation pyrometer
Either B or C

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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
Polarograph is meant for the analysis of

Gaseous mixture
Isotopes
Miscible liquids
Solids

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Process Control and Instrumentation
Temperature of __________ can not be measured by an optical or radiation pyrometer.

Molten slag flowing out of blast furnace
Combustion space in boilers
Hot blast (air) from stoves
Rotary limestone calcination kiln

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Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

0, π/2
-π/2, 0
-π/2, π/2
- ∞, π/2

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