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Process Control and Instrumentation

Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.01
0.001
0.1
0.0001

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Process Control and Instrumentation
Emission spectroscopy is used for

NOxdetermination
Determining water purity
Solids and metal analysis
Determination of CO₂ in gases

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

High thermal conductivity
Large area but small mass
All of these
Small specific heat

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

100
75
25

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Process Control and Instrumentation
The operation of a rotameter is based on

Rotation of a turbine
Pressure drop across a nozzle
Variable flow area
Pressure at a stagnation point

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Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by

Introducing integral control
None of these
Reducing value of Kc
Introducing derivative control

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