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Process Control and Instrumentation

Process Control and Instrumentation
Range of hydrogen gas constant volume themometer is __________ °C.

-10 to 20
0 to 100
100 - 500
400 - 1000

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

Water
Mercury
Methyl alcohal
Carbon-tetrachloride

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

All of these
High thermal conductivity
Large area but small mass
Small specific heat

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Process Control and Instrumentation
Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

None of these
Pirani
Ionisation
Mcloid

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Process Control and Instrumentation
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

250
750
500
1000

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Process Control and Instrumentation
Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a

Dilatometer
Beckman thermometer
Bimetallic thermometer
Mercury thermometer

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