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Semiconductor Electronics · Question 96

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

Reverse bias applied to a junction diode

  1. lowers the potential barrier
  2. raises the potential barrier
  3. increases the majority carrier current
  4. increases the minority carrier current

Answer

(2) raises the potential barrier

Solution

As per NCERT, under reverse bias the applied voltage V is in the same direction as the barrier potential.

⇒ Effective barrier height = V0 + V, i.e. the potential barrier is raised and the depletion layer widens.

The majority carrier (diffusion) current falls sharply; the small minority carrier (drift) current is nearly independent of the applied voltage (reverse saturation current).

∴ Reverse bias raises the potential barrier.

Answer: (2)

AIPMT 2003

Keep practising — Semiconductor Electronics

2

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

  1. 25 Hz
  2. 50 Hz
  3. 70.7 Hz
  4. 100 Hz
AIPMT 2003
3

Barrier potential of a p-n junction diode does not depend on

  1. diode design
  2. temperature
  3. forward bias
  4. doping density
AIPMT 2003
4

An n-p-n transistor conducts when

  1. both collector and emitter are positive with respect to the base
  2. collector is positive and emitter is negative with respect to the base
  3. collector is positive and emitter is at same potential as the base
  4. both collector and emitter are negative with respect to the base
Out of syllabusAIPMT 2003
5

In a p-n junction

  1. high potential at n side and low potential at p side
  2. high potential at p side and low potential at n side
  3. p and n both are at same potential
  4. undetermined.
AIPMT 2002
6

The given truth table is for which logic gate? [figure]

  1. NAND
  2. XOR
  3. NOR
  4. OR.
AIPMT 2002
7

For the given circuit of p-n junction diode, which is correct? [figure]

  1. in forward bias the voltage across R is V
  2. in reverse bias the voltage across R is V
  3. in forward bias the voltage across R is 2V
  4. in reverse bias the voltage across R is 2V.
AIPMT 2002
8

For a transistor ICIE = 0.96, then current gain for common emitter is

  1. 12
  2. 6
  3. 48
  4. 24
Out of syllabusAIPMT 2002
9

The given truth table is for which logic gate [figure]

  1. NAND
  2. XOR
  3. NOR
  4. OR
AIPMT 2001
10

The current in the circuit will be [figure]

  1. 540 A
  2. 550 A
  3. 510 A
  4. 520 A
AIPMT 2001
11

For a common base circuit if ICIE = 0.98 then current gain for common emitter circuit will be

  1. 49
  2. 98
  3. 4.9
  4. 25.5
Out of syllabusAIPMT 2001

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