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Process Control and Instrumentation

Process Control and Instrumentation
For an input forcing function, X(t) = 2t², the Laplace transform of this function is

2/s²
4/s²
2/s³
4/s³

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Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

Viscosity
All of these
Volume
Pressure

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

None of these
Unstable
Critically damped
Stable

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Is unstable
Has a non-zero slope at the origin
Has a damped oscillatory characteristics
Is overdamped

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Process Control and Instrumentation
Load cells are used for the measurement of

Strain
Weight
Stress
Velocity

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Process Control and Instrumentation
On-off controllers are normally used for

Low loads
Flow rate changes
None of these
Temperature changes

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