Assertion (A): It is not desirable to drive a transistor into hard saturation in high speed switching circuits.

Reason (R): It may not be possible to bring it back to cutoff state, if it is driven into hard saturation.

Match the following:

Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.

Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.

Assertion (A): Derivative control action is also called rate control and has an anticipatory character.

Reason (R): Derivative control amplifies noise signals.

1. increases with Q increasing frequency
2. varies linearly with frequency
3. increase with increasing frequency because R increases at high frequency
4. decrease after the peak frequency because R increases at H.F. the correct statements are