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Process Control and Instrumentation

Process Control and Instrumentation
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

Fahrenheit
Kelvin
Reaumer
Centigrade

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Process Control and Instrumentation
Which of the systems having following transfer functions is stable?

1/(s² + 2s + 2)
1/(s²+ 2)
Exp(-20s)/(s² + 2s-l)
1/(s²-2s + 3)

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Process Control and Instrumentation
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.

Manipulated
Controlled
Load
None of these

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

Nyquist
None of these
Ruth
Mikhalov

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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.

25
75
100

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Process Control and Instrumentation
A mercury barometer measures the __________ pressure.

Vacuum
Gauge
Absolute
Atmospheric

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