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Process Control and Instrumentation

Process Control and Instrumentation
A manometer measures the __________ pressure.

Gauge
None of these
Absolute
Atmospheric

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Process Control and Instrumentation
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

Conductor
Solid semi-conductor
Liquid semi-conductor
Insulator

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Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

R - C
R + C
RC
1/RC

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

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

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Process Control and Instrumentation
Bode stability method uses __________ loop transfer function.

Open
Neither A nor B Here
Either A Or B Here
Closed

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Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

Routh test
Frequency response methods
None of these
Root locus methods

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