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
Either B or C
Radiation pyrometer
Chromel-alumel thermocouple

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Process Control and Instrumentation
Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as

8, 0.6, 0.08
8, 0.6, 0.12
12, 0.6, 0.12
12, 0.4, 0.08

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Process Control and Instrumentation
Select the correct statement from the following.

The amplitude ratio of a pure capacity process is inversely proportional to frequency
The amplitude ratio of a pure time delay system increases with frequency
The phase lag of a pure time delay system decreases with increasing frequency
The frequency response of a pure capacity process is unbounded

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