Discussion
In a full wave rectifier, for an input ac voltage
Answer: E
The keyed statement is that a centre tapped transformer is used.
The standard two-diode full-wave rectifier uses a centre-tapped transformer: each half of the secondary feeds one diode, so one diode conducts in the positive half cycle and the other in the negative half cycle, and the load receives current in both halves.
That rules out the other statements: output appears in both half cycles, not the positive one only; the two diodes never conduct together; and each diode is forward biased in one half cycle and reverse biased in the other, not permanently. (A bridge rectifier reaches full-wave output without a centre tap, using four diodes, but the statement fits the two-diode circuit the question describes.)
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