Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Is a constant
Grows exponentially with time
Decays linearly with time
Grows linearly with time

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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

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

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