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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following controllers has maximum offset?

P-I controller
P-D controller
P-controller
P-I-D controller

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Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Non-linear relation of emf to temperature
Corrosion resistance
Oxidation resistance
Linear relation of emf to temperature

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Process Control and Instrumentation
Bode diagram are generated from output response of the system subjected to which of the following input?

Step
Ramp
Sinusoidal
Impulse

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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 open loop transfer function of a control system is KR/(1 + TS) . This represents

A first order system
Dead time system
A first order time lag
A second order system

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Process Control and Instrumentation
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?

Thomson effect
Seebeck effect
Peltier effect
None of these

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