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Electronics and Communication Analog Electronics Difficulty: Medium

Let \[{x_1}\left( t \right) = \left\{ {\begin{array}{*{20}{c}} 6&{{\text{for }}0 < t < 4} \\ 0&{{\text{otherwise}}} \end{array}} \right.{\text{and }}{x_2}\left( t \right) = u\left( {t - 2} \right)\] and y(t) = x 1 (t) * x 2 (t), then the value of y(4) is A Zener diode works on the principle of For telegraphy the most commonly used modulation system is If the functions W, X, Y and Z are as follows $$\eqalign{ & {\text{W}} = {\text{R}} + \overline {\text{P}} {\text{Q}} + \overline {\text{R}} {\text{S}} \cr & {\text{X}} = {\text{PQ}}\overline {\text{R}} \overline {\text{S}} + \overline {\text{P}} \overline {\text{Q}} \overline {\text{R}} \overline {\text{S}} + {\text{P}}\overline {\text{Q}} \overline {\text{R}} \overline {\text{S}} \cr & {\text{Y}} = {\text{RS}} + \overline {{\text{PR}} + {\text{P}}\overline {\text{Q}} + \overline {\text{P}} \overline {\text{Q}} } \cr & {\text{Z}} = {\text{R}} + {\text{S}} + \overline {{\text{PQ}} + \overline {\text{P}} \overline {\text{Q}} \overline {\text{R}} + {\text{P}}\overline {\text{Q}} \overline {\text{S}} } \cr} $$ Then (a) W Z,X Z = = (b) W Z,X Y = = (c) W = Z, X = Y (d) W Y Z If n 1 and n 2 are the refractive indices of the core and cladding respectively, the maximum acceptance angle at the air-core interface should be