Chemical Engineering :: Process Control and Instrumentation
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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
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Which of the following does not figure in the list of seven substances selected for international temperature scale ?
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A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.
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Routh test
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The open loop transfer function of a process is
. In the root locus diagram, the poles will be at -
Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as :
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When a bare thermocouple is covered by a protective sheath, the response becomes
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What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?
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Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.
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A.
criterion provides information about the actual location of roots.
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B.
cannot be used to test the stability of a control system containing transportation lag.
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C.
criterion is not applicable to systems with polynomial characteristic equation.
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D.
can not determine as to how many roots of the characteristics equation have positive real roots.
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