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Process Control and Instrumentation

Process Control and Instrumentation
The transfer function for a P-D controller is

Kc(1+τD s)
Kc/τD s
Kc(1 +1/τD s)
Kc τD s

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

None of these
Critically damped
Unstable
Stable

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Process Control and Instrumentation
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an

Magnetic flow meter
Hot wire anemometer
Orificemeter
Venturimeter

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Process Control and Instrumentation
Which of the following can not measure a temperature of 1600°C ?

Radiation pyrometer
Thermocouple
Platinum resistance thermometer
Photo-electric pyrometer

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Kc is increased
Kc is reduced
Derivative control action is introduced
Integral control action is introduced

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of a __________ is 1.

First order system
None of these
Transportation lag
Second order system

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