Process Control and Instrumentation
Which of the following can measure temperatures in the range of - 20 to 300°C ?

Vapor pressure thermometer
None of these
Mercury in glass thermometer
Resistance thermometer

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Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Filling nitrogen under pressure in the stem
Accounting for the tube expansion
Increasing the diameter of the tube
Using steel tube in place of glass tube

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