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Process Control and Instrumentation

Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

68
54
36
12

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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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Process Control and Instrumentation
Composition of alloys can be determined by

Refractrometer
Chromatograph
Polarograph
None of these

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

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

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

Critically damped
Overdamped
Underdamped
Highly fluctuating

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

H/G
G/(1 + H)
G/H
H(1 + G)

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