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Process Control and Instrumentation

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

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

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

Kennison nozzle
Orificemeter
Both B & C
Open weir

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

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

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Process Control and Instrumentation
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

-90°
45°
-180°
-45°

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

A metal powder or graphite
Oil
Mercury
Air

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

PI
PID
P
PD

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