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Process Control and Instrumentation

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

Unstable
None of these
Stable
Critically damped

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Process Control and Instrumentation
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).

W = √(7/6), Kc = 46/3
W = 1/√14, Kc = 45/7√14
W = 1, Kc = 13
W = √(7/8), Kc = 45/4

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Process Control and Instrumentation
Bode stability method uses __________ loop transfer function.

Open
Closed
Either A Or B Here
Neither A nor B Here

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Process Control and Instrumentation
A manometer measures the __________ pressure.

Gauge
Absolute
None of these
Atmospheric

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Process Control and Instrumentation
The thermal emf-temperature relationship of most thermocouples is

Linear
Exponential
Square root
Parabolic

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Process Control and Instrumentation
Phase margin is equal to

Phase lag + 180°
Phase lag + 90°
180° - phase lag
Phase lag - 180°

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