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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

Dead zone
Drift
None of these
Static error

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Process Control and Instrumentation
A bolometer is

An element which senses optical input and delivers thermal output
Neither A nor B Here
Used for the measurement of thermal radiation
Both A & B Here

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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
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

250
700
550
350

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Process Control and Instrumentation
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?

>1
None of these
1
< 1

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Process Control and Instrumentation
__________ controller has the maximum stabilising time.

PID
P
PD
PI

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