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

2 AT
1.5 AT
√AT
0.5 AT

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Is overdamped
Is unstable
Has a non-zero slope at the origin
Has a damped oscillatory characteristics

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Process Control and Instrumentation
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?

Mercury in steel thermometer
Alcohol in glass thermometer
Mercury in glass thermometer
Fused metal (Na or K) in steel thermometer

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Process Control and Instrumentation
Emf generated in a thermocouple depends on the temperature

Difference between hot and cold junctions
Of hot junction only
Of cold junction only
Difference between cold junction and atmospheric temperature

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Process Control and Instrumentation
Dilatometer is used to measure

Stress
Strain
Contraction/expansion due to changes in temperature
Deflection

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