State whether true or false and justify .
a Zener diodes are used under forward bias.
b. In n-p-n transistor , current conduction is primarily due to electrons .
c. Transistor amplifiers do not strictly obey law of conservation of energy since output power is greater than input power .
d. In a transistor amplifier all the frequency will have exactly equal gain .

Explanation

a. False . Zener diodes are used under reverse bias .
b. True c . False d . False