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Process Control and Instrumentation

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

PH meter
Polarograph
Chromatograph
Polarimeter

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Process Control and Instrumentation
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?

Thermocouples
Radiation pyrometer
Optical pyrometer
Photoelectric pyrometer

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Process Control and Instrumentation
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

Reaumer
Kelvin
Fahrenheit
Centigrade

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Process Control and Instrumentation
The term analogous to the electrical current in a thermal system is the

Temperature difference
None of these
Heat content in the system
Heat flow rate

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Process Control and Instrumentation
Characteristic equation is the denominator of __________ loop transfer function.

Closed
Both A & B Here
Neither A Nor B Here
Open

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

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