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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is not a mechanical pressure sensing element?

U-tube
Bellows
Diaphragm
Bourdon tube

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Chromel-alumel
Iron-constantan
Either A, B or C
Platinum-platinum+rhodium

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Process Control and Instrumentation
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Remains constant
Decreases
Increases exponentially
Increases

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Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Sum
Product
Ratio
Difference

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Process Control and Instrumentation
Mercury thermometer can be used to measure the temperature upto __________ °C.

750
350
100
250

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

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

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