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Process Control and Instrumentation

Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

0°
90°
45°
180°

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Process Control and Instrumentation
Instrumentation in a plant offers the advantage of

All of these
Better quality of product
Greater operation economy
Greater safety of operation

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Process Control and Instrumentation
Bode diagram are generated from output response of the system subjected to which of the following input?

Impulse
Step
Ramp
Sinusoidal

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Process Control and Instrumentation
In Bode plot, Φ vs ω is plotted on a/an __________ graph paper.

Log-log
Ordinary
Semi-log
Triangular

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Process Control and Instrumentation
Which of the following is a 'contact' pyrometer?

Optical pyrometer
Resistance pyrometer
Radiation pyrometer
Infra red pyrometer

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Process Control and Instrumentation
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

nRT/V
V/nRT
nRT/P
p/nRT

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