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Process Control and Instrumentation

Process Control and Instrumentation
Psychrometer determines the

Hygroscopic nature of solids
Humidity of gases
Moisture content of solids
Water of crystallisation

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Process Control and Instrumentation
Which is the most suitable instrument for measuring pressure below 3 microns?

Ionisation gauge
Bourdon guage
Alphatron
Mcleoid gauge

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

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

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

Copper
Lead
Nickel
30% iron + 70% nickel

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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.

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

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

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

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