Semiconductors & Communication · JEE Main previous year questions

2004 3 questions

1. Q1412004 · 24 Apr 2004 · Shift 1

   When $p$-$n$ junction diode is forward biased then

   1. A.both the depletion region and barrier height are reduced
   2. B.the depletion region is widened and barrier height is reduced
   3. C.the depletion region is reduced and barrier height is increased
   4. D.both the depletion region and barrier height are increased
   Show answer

   Answer: A

2. Q1452004 · 24 Apr 2004 · Shift 1

   When $npn$ transistor is used as an amplifer

   1. A.electrons move from collector to base
   2. B.holes move from emitter to base
   3. C.electrons move from base to collector
   4. D.holes move from base to emitter
   Show answer

   Answer: C

3. Q1462004 · 24 Apr 2004 · Shift 1

   For a transistor amplifier in common emitter configuration for load impedance of $1k\Omega$ $(h_{fe}=50$ and $h_{oe}=25\mu A/V)$ the current gain is

   1. A.$-24.8$
   2. B.$-15.7$
   3. C.$-5.2$
   4. D.$-48.78$
   Show answer

   Answer: D