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Process Control and Instrumentation

Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Τds + 1
E-τds
Eτds
1/(τds + 1)

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Process Control and Instrumentation
Flow rate of sludge is not measured by a/an

Kennison nozzle
Orificemeter
Open weir
Both B & C

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

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

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Process Control and Instrumentation
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

Embrittlement of iron occurs
Rusting of iron takes place
Both B and C Here
Emf produced is very low of the order of microvolt

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Process Control and Instrumentation
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is

1 - et
1 + e-t
1 - e-t
1 + et

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Process Control and Instrumentation
Meleoid gauge measures the __________ pressure.

Positive
Atmospheric
Sub-atmospheric
Very high

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