The transistor used in the circuit shown below has a $$\beta $$ of $$30$$ and $${{\rm I}_{CBO}}$$ is negligible.

If the forward voltage drop of diode is $$0.7V.$$ Then the current through collector will be

A low pass filter with a cut-off frequency of $$30Hz$$ is cascaded with a high pass filter with a cut off frequency of 20Hz. The resultant system of filters coil function as

For the circuit shown below, the correct transfer characteristics is

An open loop system represented by the transfer function $$G\left( s \right) = {{\left( {s - 1} \right)} \over {\left( {s + 2} \right)\left( {s + 3} \right)}}$$ is