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Process Control and Instrumentation

Process Control and Instrumentation
__________ are analysed using a polarograph.

Gases
Solids
Isotonic solutions
Liquids

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

None of these
Iron-constantan
Chromel-alumel
Platinum-platinum+rhodium

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Process Control and Instrumentation
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

750
1000
250
500

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

250
700
350
550

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Process Control and Instrumentation
In an exothermic chemical reactor, the manipulated variable is the flow rate of

Product
Coolant
Reactants
None of these

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Process Control and Instrumentation
A non-linear system will have __________ steady state values.

Three
Two
More than one
One

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