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Process Control and Instrumentation

Process Control and Instrumentation
Thermistors are made of

Metal oxides
Ultra pure metals
Iron-copper alloys
Nickel-chromium alloys

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Process Control and Instrumentation
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

Increase
No change
Decrease
Exponential decrease

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Process Control and Instrumentation
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'

Rankine
Celcius
Reumur
Farenhite

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Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

High fidelity
Poor reproducibility
High measuring lag
High drift

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Process Control and Instrumentation
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?

√AT
2 AT
1.5 AT
0.5 AT

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Process Control and Instrumentation
Which of the following thermocouples can measure the maximum temperature?

Platinum-rhodium
Iron-constantan
Tungsten-molybdenum
Chromel-alumel

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