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Process Control and Instrumentation

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

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

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Process Control and Instrumentation
Change of angle of refraction with composition comprises the working principle of a

Polarimeter
Refractrometer
Polarograph
Spectrometer

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Process Control and Instrumentation
Flapper nozzle is used in a/an __________ controller.

Electronic
Hydraulic
None of these
Pneumatic

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Process Control and Instrumentation
Which of the following measurements can be made by the measurement of emf?

Composition of complex ions
All of these
PH value
Degree of hydrolysis

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Process Control and Instrumentation
Which of the following thermocouples has the widest temperature measurement range?

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

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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

0°
180°
45°
90°

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