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Process Control and Instrumentation

Process Control and Instrumentation
Meleoid gauge measures the __________ pressure.

Atmospheric
Very high
Sub-atmospheric
Positive

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

Iron-constantan
Chromel-alumel
Copper-constantan
Platinum-platinum + rhodium

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Process Control and Instrumentation
Flame photometry is used for the determination of compositional analysis of

Solids
Isotopes
Natural gas
Alkali metals

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Process Control and Instrumentation
Pick out the first order system from among the following.

Damped vibrator
Interacting system of two tanks in series
Non-interacting system of two tanks in series
Mercury in glass thermometer kept in boiling water

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

None of these
Stable
Unstable
Critically damped

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Process Control and Instrumentation
Use of I-control along with P-control facilitates

Reduction of offset
Elimination of offset
None of these
Reduction of stability time

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