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Process Control and Instrumentation

Process Control and Instrumentation
__________ thermometer can not measure sub-zero (< 0° C) temperature,

Bimetallic
Resistance
Mercury in glass
Vapor pressure

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

Bourdon guage
Mcleoid gauge
Alphatron
Ionisation gauge

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Process Control and Instrumentation
Which of the following is an undesirable dynamic characteristic of an instrument?

Static error
Time lag
Reproducibility
Dead zone

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

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

E-τds
1/(τds + 1)
Eτds
Τds + 1

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Process Control and Instrumentation
Range of hydrogen gas constant volume themometer is __________ °C.

-10 to 20
400 - 1000
100 - 500
0 to 100

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