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Semiconductor Electronics

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

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 syllabus

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Ques. 2AIPMT 2002

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.
Ques. 3AIPMT 2002

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

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

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.
Ques. 5AIPMT 2002

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

  1. 12
  2. 6
  3. 48
  4. 24
Out of syllabus
Ques. 6AIPMT 2001

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

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

The current in the circuit will be [figure]

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

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 syllabus
Ques. 9AIPMT 2000

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

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

The correct relation between and for a transistor is

  1. = 1-
  2. = 1-
  3. = -1
  4. = 1
Out of syllabus

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