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Process Control and Instrumentation

Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Eτds
Τds + 1
1/(τds + 1)
E-τds

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Process Control and Instrumentation
In a single tank system, the transfer function of level to inlet flow rate is

R/(TS + 1)
L(TS + l)
1/TS
R/TS

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Process Control and Instrumentation
Specific gravity of a liquid can not be measured by a/an

Hydrometer
Specific gravity bottle
Anemometer
Pycnometer

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

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

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of a __________ is 1.

First order system
Transportation lag
Second order system
None of these

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Process Control and Instrumentation
Liquid levels in autocalves are measued by

None of these
Differential float type manometer
Simple float
Glass gauge

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