Analog Electronics
N-type extrinsic semiconductor is obtained by adding

 pentavalent impurity
 tetravalent impurity
All of these
 trivalent impurity

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Analog Electronics
Which of the following statements is false?

A push pull output transformer has a centre-tapped primary
Class AB operation cannot be used for a push pull audio power output phase
All of these
Push pull signals are equal and opposite in phase

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