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Process Control and Instrumentation

Process Control and Instrumentation
Continuous measurement of specific gravity of a liquid is done by

Contact-type electric indicators
Both A and C
Displacement meter
Hydrometer

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Process Control and Instrumentation
Liquid flow rate in an open channel can not be measured by a/an

V-notch
Rectangular weir
Cipolletti weir
Orifice meter

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

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Process Control and Instrumentation
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Increases
Decreases
Remains constant
Increases exponentially

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Process Control and Instrumentation
The unit of 'time constant' of a system is the same as that of

None of these
Time
(time)⁻¹
Velocity

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Process Control and Instrumentation
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

Mercury in glass thermometer
Nitrogen in steel thermometer
Fused metal (Na or K) in steel thermometer
Alcohol in glass thermometer

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