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Process Control and Instrumentation

Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

R + C
1/RC
RC
R - C

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Process Control and Instrumentation
High temperature of around 2000°C of incandescent gas mantles is measured by a/an

Optical pyrometer
Specially designed thermocouple
Radiation pyrometer
None of these Here

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Process Control and Instrumentation
Which of the following is not classified as a thermo electric pyrometer

Resistance thermometer
Radiation pyrometer
Optical pyrometer (disappearing filament type)
Thermocouple

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

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

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

Large area but small mass
All of these
High thermal conductivity
Small specific heat

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Process Control and Instrumentation
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

29
0.1
13
3

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