Process Instrumentation and Control - Interview Questions | Exam2Win

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31. Thermal expansion of a solid is employed in :

A. thermocouple

B. resistance thermometer

C. bulb thermometer

D. bimetal element

E. zener diode.

Explanation:

32. Pick up false statement about liquid-in-metal thermometers :

A. remote indication of temperature can't be given

B. error is produced if capillary passes through hot zone

C. error also occurs if instrument base is at high ambient temperature

D. error can also creep in by the head of the liquid if the bulb is installed either above or below the Bourdon

E. these are used for industrial applica-tions where accuracy is not so impor-tant.

Explanation:

33. Pick up the appropriate word for A pointer moving over a scale :

A. instrument

B. indicator

C. transducer

D. gauge

E. recorder.

Explanation:

34. For measuring temperature in the range of 200 to 30�C, following liquid is used in glass thermometer:

A. mercury

B. alcohol

C. toluene

D. pentane

E. creosote.

Explanation:

35. Which gauge is based on the change of heat conductivity of a gas with pressure and the change of electrical resistance of a wire with temperature :

A. thermocouple gauge

B. Bourdon gauge

C. Ionization gauge

D. nuitating disk gauge

E. Pirani gauge.

Explanation:

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