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Process Control and Instrumentation

Process Control and Instrumentation
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?

0.5 AT
√AT
1.5 AT
2 AT

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Process Control and Instrumentation
Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

Vycor (a glass)
Inconel
Nichrome
Steel

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

Platinum-platinum+rhodium
None of these
Iron-constantan
Chromel-alumel

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Process Control and Instrumentation
The operation of a rotameter is based on

Rotation of a turbine
Variable flow area
Pressure at a stagnation point
Pressure drop across a nozzle

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

-10
10
-20
20

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Process Control and Instrumentation
Working principle of radiation pyrometer is based on the

Seebeck effect
Stafan-Boltzman law
Wien's law
Kirchoffs law

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