The input resistance of a silicon transistor is \(665\Omega \). Its base current is changed by \(15\ \mu A\) which results in the change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of \(5 \ k\Omega \). Calculate
(a) current gain, \(\beta _{ ac }\) ; 
(b) transconductance \(g_{ m }\) and
(c) voltage gain \(A_{ v }\) of the amplifier. 

3

(a)

As, we know, an n-type semiconductor has large number of electrons but it is still electrically neutral. Why?

3

(a)

How would you set up a circuit to obtain NOT gate using a transistor?

3

(a)

A circuit symbol of a logic gate and two input wave forms A and B are shown.
a) Name the logic gate

b) Give the output wave form

3

(a)

The diode shown in the figure has a constant voltage drop of 0.5V at all currents and a maximum power rating of 100mW. What should be the value of resistance R connected in series, for maximum current.?

3

(a)