The output current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is ........... .

A change of $$0.04 \mathrm{~V}$$ takes place between the base and the emitter when an input signal is connected to the common emitter transistor amplifier. As a result, $$20 ~\mu \mathrm{A}$$ change takes place in the base current and a change of $$2 \mathrm{~mA}$$ takes place in the collector current. The input resistance and AC current gain are

The truth table given below corresponds to logic gate.

A transistor is connected in common emitter configuration. The collector supply is $$8 \mathrm{~V}$$ and the voltage drop across a resistor of $$800 \Omega$$ in the collector circuit is $$0.5 \mathrm{~V}$$. If the current gain factor $$\alpha$$ is 0.96, then the base current is