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Process Control and Instrumentation

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

Stable
Critically damped
None of these
Unstable

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Process Control and Instrumentation
The transfer function for a P-D controller is

Kc(1+τD s)
Kc/τD s
Kc τD s
Kc(1 +1/τD s)

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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

Semi conductors
Conductors
Dielectrics
Insulators

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Process Control and Instrumentation
A bolometer is

An element which senses optical input and delivers thermal output
Both A & B Here
Used for the measurement of thermal radiation
Neither A nor B Here

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Process Control and Instrumentation
Phase lag of the sinusoidal response of a first order system is

90°
120°
30°
180°

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Process Control and Instrumentation
Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

Silver
Gold
Nickel
Antimony

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