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Process Control and Instrumentation

Process Control and Instrumentation
Typical specifications for design stipulates the gain margin and phase margin to be respectively

< 1.7 and > 30°
> 1.7 and > 30°
> 1.7 and < 30°
< 1.7 and < 30°

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Is a constant
Grows exponentially with time
Decays linearly with time
Grows linearly with time

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Process Control and Instrumentation
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

None of these
Chromel-alumel
Platinum-platinum/rhodium
Iron-constantan

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Process Control and Instrumentation
The open loop transfer function of a control system is KR/(1 + TS) . This represents

A first order system
A first order time lag
A second order system
Dead time system

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Process Control and Instrumentation
The __________ of a vapor pressure thermometer is a secondary element.

Bourdon tube
Bulb
Pointer
None ofthese

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Process Control and Instrumentation
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

Polarograph
Polarimeter
PH meter
Chromatograph

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