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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
Seebeck effect
Kirchoff's law
Peltier effect

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Process Control and Instrumentation
Silver point temperature is __________ °C.

1060.5
760.5
860.5
960.5

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.

Increase of thermal conductivity
Differential linear expansion
Increase of pressure
Volumetric expansion

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Process Control and Instrumentation
Stroboscope is used for the measurement of

Frequency of light
Liquid level under pressure
Rpm of a flywheel
Depression of freezing point

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Process Control and Instrumentation
Phase margin is equal to

Phase lag + 180°
Phase lag - 180°
180° - phase lag
Phase lag + 90°

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Process Control and Instrumentation
Typical specifications for design stipulates the gain margin and phase margin to be respectively

< 1.7 and < 30°
< 1.7 and > 30°
> 1.7 and > 30°
> 1.7 and < 30°

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