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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°
45°
90°
180°

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Process Control and Instrumentation
The level of a liquid under pressure can be determined using

Diaphragm box system
Air-trap system
Differential pressure manometer
Bubbler system

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Process Control and Instrumentation
Which of the following is not a mechanical pressure sensing element?

Bellows
Bourdon tube
Diaphragm
U-tube

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Process Control and Instrumentation
__________ is an example of distributed parameter system

Tubular reactor
CSTR
On-off controller
None of these

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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
Maximum differential pressure in liquid manometer is __________ psi.

40
50
20
30

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