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Process Control and Instrumentation

Process Control and Instrumentation
Thermistors are used in __________ devices.

Both B & C
Temperature measuring
Temperature compensating
Voltage measuring

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

1/√2
1
0.25
0.5

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Process Control and Instrumentation
Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 loge (AR)0.5
Decibel = 20 log10 (AR)0.5
Decibel = 20 log10 (AR)
Decibel = 20 loge (AR)

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Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Has a slower speed of response
Can measure higher temperature
Is more affected by corrosive atmosphere
Can't measure the temperature of moving objects

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

Chromel-alumel
Iron-constantan
Platinum-rhodium
Platinum-platinum+rhyodium

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Process Control and Instrumentation
Dilatometer is used to measure

Deflection
Strain
Stress
Contraction/expansion due to changes in temperature

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