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Process Control and Instrumentation

Process Control and Instrumentation
Response of a system to a sinusoidal input is called __________ response.

Impluse
Frequency
None of these
Unit step

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Process Control and Instrumentation
Continuous measurement of moisture content of paper in paper industry is done by measuring the

Electrical resistance through the paper
Magnetic susceptibility
None of these
Thermal conductivity through the paper

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

Venturimeter
Rotameter
Hot wire anemometer
Pitot tube

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Process Control and Instrumentation
An aneroid barometer measures the __________ pressure.

Vacuum
Absolute
Gage
Atmospheric

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Process Control and Instrumentation
Dead zone in an instrument must be less than __________ percent of the scale.

0.2
1.5
4
8

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 120°
Is 90° at the most
Approaches 180° asymptotically
Is 30°

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