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Process Control and Instrumentation

Process Control and Instrumentation
Out of the following themocouple wire insulating material, the highest temperature rating is for

Teflon
Ceramic fibre
Asbestos
Fibre glass

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Process Control and Instrumentation
Nichol's chart deals with

Frequency response values of controllers
R. vs. phase lag of first order
R. vs. phase lag of second order
Closed loop values vs. open loop values

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 90° at the most
Is 120°
Approaches 180° asymptotically
Is 30°

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Is overdamped
Is unstable
Has a non-zero slope at the origin
Has a damped oscillatory characteristics

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Process Control and Instrumentation
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Thermo electric pyrometer
Filled system thermometer
Mercury in glass thermometer
Radiation/infrared pyrometer

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Process Control and Instrumentation
Compositional analysis of __________ is done using mass spectrometer.

Natural gas
A solid
An isotope
An alloy

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