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Process Control and Instrumentation

Process Control and Instrumentation
Identify an unbounded input from inputs whose transfer functions are given below

1/S²
1/S
1
1/(S² + 1)

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

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

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Process Control and Instrumentation
The pressure sensing element of elastic type pressure gauge is never made in the form of a

Diaphragm
Strip
Bourdon tube
Bellow

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Process Control and Instrumentation
In a single tank system, the transfer function of level to inlet flow rate is

R/(TS + 1)
L(TS + l)
1/TS
R/TS

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

Nyquist
None of these
Routh stability
Bode stability

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

100
25
75

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