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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

180°
45°
90°
0°

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Mercury thermometer
Thermocouple
Radiation pyrometer
Bimetallic thermometer

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

Highly fluctuating
Overdamped
Underdamped
Critically damped

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Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Sum
Ratio
Product
Difference

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Process Control and Instrumentation
An aneroid barometer measures the __________ pressure.

Vacuum
Absolute
Atmospheric
Gage

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Process Control and Instrumentation
Meleoid gauge measures the __________ pressure.

Very high
Sub-atmospheric
Positive
Atmospheric

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