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Process Control and Instrumentation

Process Control and Instrumentation
When the damping co-efficient (ξ) is unity, the system is

Overdamped
Highly fluctuating
Critically damped
Underdamped

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Process Control and Instrumentation
Use of I-control along with P-control facilitates

Reduction of offset
Reduction of stability time
None of these
Elimination of offset

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

1/(τds + 1)
Eτds
Τds + 1
E-τds

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

Stable
None of these
Critically damped
Unstable

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Process Control and Instrumentation
Which of the following is an undesirable dynamic characteristic of an instrument?

Reproducibility
Static error
Time lag
Dead zone

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

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

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