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Process Control and Instrumentation

Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

44020
-1
1
43838

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Process Control and Instrumentation
The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be

Under damped
None of these
Critically damped
Over damped

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Process Control and Instrumentation
Thermistors are made of

Ultra pure metals
Nickel-chromium alloys
Metal oxides
Iron-copper alloys

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Process Control and Instrumentation
Bode diagram is a plot of

None of these
AR vs. log (f) and Φ vs. log (f)
Log (AR) vs. f and log Φ vs.f
Log (AR) vs. log (f) and (Φ) vs. log (f)

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Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

5π/12
π/12
π/3
π/6

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Process Control and Instrumentation
__________ type of element is normally not used in the bimetallic thermometers.

Single helix
Multiple helix
Bourdon tube
Flat spiral

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