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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

45°
90°
180°
0°

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

H/G
G/(1 + H)
H(1 + G)
G/H

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Process Control and Instrumentation
Which of the following flow-metering instru-ments is an areameter?

Venturimeter
Rotameter
Hot wire anemometer
Pitot tube

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Process Control and Instrumentation
Which of the following controllers has maximum offset?

P-I-D controller
P-controller
P-I controller
P-D controller

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Process Control and Instrumentation
Which of the following measurements can be made by the measurement of emf?

Composition of complex ions
All of these
Degree of hydrolysis
PH value

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Process Control and Instrumentation
When the damping co-efficient (ξ) is unity, the system is

Critically damped
Overdamped
Underdamped
Highly fluctuating

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