Discussion
Assertion (A) : A stub is shorted or open section of transmission line used inconjunction with transmission line.
Reason (R) : A stub cancel out reflections and provide impedance match.
Answer: B
The keyed answer is both (A) and (R) are true but (R) is not the correct explanation of (A).
A describes what a stub is: a length of transmission line, short-circuited or open-circuited at its far end, connected in shunt or series with the main line. R describes what a stub does in single- and double-stub matching: its reactance cancels the reactive part of the load seen at that point, removing reflections and matching the line.
Both statements are true. But a definition is not explained by an application: what makes something a stub is its construction, not the use it is put to (stubs are also used as filters and resonators). That is why R is not taken as the explanation of A.
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