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Process Control and Instrumentation

Process Control and Instrumentation
The unit of 'time constant' of a system is the same as that of

(time)⁻¹
Velocity
Time
None of these

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

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

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Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by

Introducing derivative control
Reducing value of Kc
None of these
Introducing integral control

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Process Control and Instrumentation
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?

Photoelectric pyrometer
Thermocouples
Optical pyrometer
Radiation pyrometer

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Process Control and Instrumentation
The fluid used in hydraulic controller is

Oil
Steam
Water
Air

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Process Control and Instrumentation
Response of a linear control system for a change in set point is called

Transient response
Frequency response
Servo problem
Regulator problem

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