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Process Control and Instrumentation

Process Control and Instrumentation
Bode stability method uses __________ loop transfer function.

Open
Neither A nor B Here
Either A Or B Here
Closed

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Process Control and Instrumentation
Liquid flow rate in a small channel is best measured by a/an

Vane meter
Weir
Pitot tube
Venturimeter

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Process Control and Instrumentation
A non-linear system will have __________ steady state values.

Three
Two
One
More than one

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Process Control and Instrumentation
A non-linear chemical system is exemplified by a/an

Mixer
Non-isothermal CSTR
None of these
Isothermal CSTR

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Process Control and Instrumentation
A typical example of a physical system with under damped characteristic is a

Thermocouple kept immersed in a liquid filled thermowell
U-tube manometer
CSTR with first order reaction
Spring loaded diaphragm valve

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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

90°
45°
180°
0°

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