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Process Control and Instrumentation

Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 30°
Approaches 180° asymptotically
Is 120°
Is 90° at the most

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Process Control and Instrumentation
Compositional analysis of __________ is done using mass spectrometer.

An isotope
A solid
Natural gas
An alloy

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Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer?

Copper
Nickel
30% iron + 70% nickel
Lead

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Process Control and Instrumentation
Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 log10 (AR)
Decibel = 20 loge (AR)
Decibel = 20 loge (AR)0.5
Decibel = 20 log10 (AR)0.5

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Process Control and Instrumentation
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Invar
Nickel
Brass
Chromel

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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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