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Process Control and Instrumentation

Process Control and Instrumentation
Working principle of disappearing filament type optical pyrometer is based on the

Wien's law
Kirchoff's law
Peltier effect
Seebeck effect

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Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 79 and 395
- 10 and 425
- 51 and 439
- 39 and 350

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Process Control and Instrumentation
Mcleoid gauge is used to measure the

Vacuum
Point velocity
Flow rate
Pressure

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Process Control and Instrumentation
Which of the following is not the triple point of water?

273°K
32°R
32°F
492°R

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Process Control and Instrumentation
Which of the following thermocouples is capable of measuring a temperature of -50°C?

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

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Process Control and Instrumentation
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

Emf produced is very low of the order of microvolt
Both B and C Here
Rusting of iron takes place
Embrittlement of iron occurs

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