Process Control and Instrumentation - Chemical Engineering Questions and Answers

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Which of the following is not the triple point of water ?

32°R

273°K

492°R

32°F

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Pick out the one which is a first order instrument.

Mercury in glass thermometer (without any covering or air gap).

Bare metallic thermometer.

Bare vapor pressure thermometer.

All (a), (b) and (c).

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Load cells are used for the measurement of

stress

weight

strain

velocity

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Which of the following is the dynamic characteristics of an instrument ?

Reproducibility

Sensitivity

Dead zone

Fidelity

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Pick out the wrong statement.

O₂, NO and NO₂ exhibit paramagnetic properties as a result of unpaired electrons.

CO₂ is the strongest paramagnetic gas.

Paramagnetic susceptibility of gases decreases with temperature.

Paramagnetic susceptibility of gases permits the measurement of their concentration.

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The __________ of a vapor pressure thermometer is a functioning element.

pointer

bourdon tube

bulb

none of these

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A negative gain margin expressed in decibels means a/an __________ system.

stable

unstable

critically damped

none of these

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Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

insulator

conductor

solid semi-conductor

liquid semi-conductor

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Flapper nozzle is used in a/an __________ controller.

electronic

hydraulic

pneumatic

none of these