Process Control and Instrumentation
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Nickel
Invar
Chromel
Brass

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Process Control and Instrumentation
The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since

The Laplace transform of integral of exp(at) has finite values only for s > a
The function exp(at) is piece-wise continuous only for s > a
The Laplace transform integral of exp(at) has initial values only for s > a
The function is exponential

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