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Process Control and Instrumentation

Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Difference
Product
Sum
Ratio

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

Vacuum
Absolute
Atmospheric
Gauge

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

63.2
87.5
100
95

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Process Control and Instrumentation
Pirani gauge is used for the measurement of

High vacuum
Very high pressure
Liquid level at atmospheric pressure
Liquid level under pressure

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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

43838
44020
-1
1

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Process Control and Instrumentation
Which of the following is not a second order instrument?

Bare mercury in glass thermometer
None of these
Mercury in glass thermometer with covering
Pressure gauge with one bellow, two tubes and a tank

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