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Process Control and Instrumentation

Process Control and Instrumentation
Thermal wells used in temperature measurements should have

Low emissivity
High transmissivity of radiation
Very thick walls
Polished surface

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Process Control and Instrumentation
The temperature range for which copper resistance thermometer can be used is __________ °C

0 to 150
500 to 900
-200 to 150
350 to 750

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Process Control and Instrumentation
Phase lag of the sinusoidal response of a first order system is

30°
180°
120°
90°

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Process Control and Instrumentation
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

CO
N₂
O₂
CO₂

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Process Control and Instrumentation
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).

W = 1, Kc = 13
W = √(7/6), Kc = 46/3
W = √(7/8), Kc = 45/4
W = 1/√14, Kc = 45/7√14

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

Nyquist
None of these
Routh stability
Bode stability

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