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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following controllers has maximum offset?

P-controller
P-I-D controller
P-D controller
P-I controller

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Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Conductors
Dielectrics
Semi conductors
Insulators

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Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Product
Ratio
Sum
Difference

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Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

0, π/2
- ∞, π/2
-π/2, 0
-π/2, π/2

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Process Control and Instrumentation
Bode diagram is a plot of

None of these
Log (AR) vs. f and log Φ vs.f
AR vs. log (f) and Φ vs. log (f)
Log (AR) vs. log (f) and (Φ) vs. log (f)

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Process Control and Instrumentation
Which of the following is not a mechanical pressure sensing element?

Bellows
U-tube
Bourdon tube
Diaphragm

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