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Process Control and Instrumentation

Process Control and Instrumentation
Configuration of Bourdon spring tube is never made of __________ shape.

Spiral
Semi-circular
Circular
Helical

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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.

95
87.5
100
63.2

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Process Control and Instrumentation
Pick out the first order system from among the following.

Interacting system of two tanks in series
Damped vibrator
Non-interacting system of two tanks in series
Mercury in glass thermometer kept in boiling water

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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

Oil
A metal powder or graphite
Air
Mercury

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Process Control and Instrumentation
Flow rate through an orifice is __________ the pressure differential.

Inversely proportional to the square of
Proportional to
Inversely proportional to the square root of
Proportional to the square root of

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Process Control and Instrumentation
Which of the following flow-metering instru-ments is an areameter?

Rotameter
Pitot tube
Venturimeter
Hot wire anemometer

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