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Process Control and Instrumentation

Process Control and Instrumentation
On-off controllers are normally used for

Low loads
None of these
Flow rate changes
Temperature changes

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Process Control and Instrumentation
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

Low electrical conductivity
Low thermal conductivity
High viscosity index
Low flash point

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Process Control and Instrumentation
Hot wire anemometer is used for the measurement of

Flow rates of granular solids
Very high temperature
Thermal conductivity of gases
Flow rates of fluids

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Process Control and Instrumentation
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

-90°
-180°
45°
-45°

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Process Control and Instrumentation
Liquid levels in autocalves are measued by

Differential float type manometer
None of these
Simple float
Glass gauge

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Chromel-alumel
Platinum-platinum+rhodium
Iron-constantan
Either A, B or C

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