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Process Control and Instrumentation

Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

90°
0°
180°
45°

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Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

54
68
12
36

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Process Control and Instrumentation
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?

Platinum-platinum + rhodium
Chromel-alumel
Copper-constantan
Iron-constantan

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Τds + 1
Eτds
E-τds
1/(τds + 1)

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Process Control and Instrumentation
Positioning controllers are used for

High loads
Low loads
Flow rate changes
Temperature changes

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Process Control and Instrumentation
The level of a liquid under pressure can be determined using

Diaphragm box system
Bubbler system
Air-trap system
Differential pressure manometer

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