What bias conditions must be present for the normal operation of a transistor amplifier?
a. the emitter-base junction must be forward biased, and the collector-base junction must be reverse biased.
b. both junctions must be forward biased.
c. the emitter-base junction must be reverse biased, and the collector-base junction must be forward biased.
d. both junctions must be reverse biased.

The condition that must be present for the normal operation of a transistor amplifier is the emitter-base junction must be reverse biased, and the collector-base junction must be forward biased. The answer is letter C. It should not drive the transistor either into saturation or into cu – off, resulting in one will deem transistors to be inefficient

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c) both a and b.