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Process Control and Instrumentation

Process Control and Instrumentation
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

Solid semi-conductor
Conductor
Liquid semi-conductor
Insulator

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Process Control and Instrumentation
Configuration of Bourdon spring tube is never made of __________ shape.

Circular
Semi-circular
Helical
Spiral

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Process Control and Instrumentation
Radiation thermometer can not measure the temperature

Of liquid oxygen
Of an object without coming in contact with it
Inside a pressure vessel
Of moving objects at high temperature

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Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

Root locus methods
Frequency response methods
Routh test
None of these

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Process Control and Instrumentation
A mercury barometer measures the __________ pressure.

Absolute
Gauge
Vacuum
Atmospheric

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

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