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Semiconductor Electronics · Question 99

AIPMT 2003MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(2) collector is positive and emitter is negative with respect to the base

Solution

For an n-p-n transistor to conduct (active region):

⇒ Emitter–base junction forward biased: the n-type emitter is negative with respect to the p-type base.

⇒ Collector–base junction reverse biased: the n-type collector is positive with respect to the base.

∴ The collector is positive and the emitter is negative with respect to the base.

Answer: (2)

Out of syllabusAIPMT 2003

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2

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
3

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

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

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
5

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
6

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

  1. NAND
  2. XOR
  3. NOR
  4. OR
AIPMT 2001
7

The current in the circuit will be [figure]

  1. 540 A
  2. 550 A
  3. 510 A
  4. 520 A
AIPMT 2001
8

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
9

From the following diode circuits, which diode is in forward biased condition?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2000
10

The correct relation between and for a transistor is

  1. = 1-
  2. = 1-
  3. = -1
  4. = 1
Out of syllabusAIPMT 2000

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