Match the following List – I A. The current gain of a BJT will be increased B. The current gain of a BJT will be reduced C

Question

Match the following.

List – I	List – II
A. The current gain of a BJT will be increased	1. The collector doping concentration is increased
B. The current gain of a BJT will be reduced	2. The base width is reduced.
C. The break – down voltage of a BJT will be reduced	3. The emitter doping concentration to base doping concentration ratio is reduced.
	4. The base doping concentration is increased keeping the ratio of the emitter doping concentration to base doping concentration constant.
	5. The collector doping concentration is reduced.

(a) A – 2, B – 3, C – 1

(b) A – 2, B – 5, C – 1

(c) A – 2, B – 3, C – 4

(d) A – 4, B – 3, C – 1

Answer 1

Note that list II gives the actions taken on the device and list I corresponds to the results so, look at list II first.

The second option is that base width is reduced, this will decrease recombination in base, thus IC will increase, this will increase α

As per option 3 in List II

If emitter doping concentration to base doping concentration is reduced, then emitter injection efficiency is reduced, this decreases α.