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Process Control and Instrumentation

Process Control and Instrumentation
A system with transfer function (2S/4S) + 1 is of __________ order.

Zero
1st
2nd
3rd

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Process Control and Instrumentation
When a bare thermocouple is covered by a protective sheath, the response becomes

Slower and non-oscillatory
Faster and oscillatory
Slower and oscillatory
Faster and non-oscillatory

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

12
36
54
68

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Process Control and Instrumentation
Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 loge (AR)0.5
Decibel = 20 log10 (AR)
Decibel = 20 loge (AR)
Decibel = 20 log10 (AR)0.5

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Process Control and Instrumentation
In second order underdamped system,

Large damping co-efficient means smaller damping
Decay ratio = (overshoot)²
Overshoot increases for increasing damping co-efficient
Decay ratio = overshoot

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Process Control and Instrumentation
Transfer function of transportation lag is

1/(TS + 1)
E-TS
ETS
None of these

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