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Semiconductor Electronics · Question 32

NEET 2018MCQEasy📈 Topic in 25% papers+4−1
1

In a p-n junction diode, change in temperature due to heating

  1. affects only reverse resistance
  2. affects only forward resistance
  3. does not affect resistance of p-n junction
  4. affects the overall V - I characteristics of p-n junction

Answer

(4) affects the overall V - I characteristics of p-n junction

Solution

Heating increases the number of thermally generated electron–hole pairs (intrinsic carriers).

In forward bias, the barrier potential decreases and the current for a given voltage increases.

In reverse bias, the minority-carrier (reverse saturation) current increases.

Both forward and reverse resistances change, i.e. the overall V–I characteristics of the junction are affected.

Answer: (4)

NEET 2018

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2

In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 and VCE = 0. The values of IB, IC and β are given by [figure]

  1. IB = 40 , IC = 10 mA, β = 250
  2. IB = 25 , IC = 5 mA, β = 200
  3. IB = 20 , IC = 5 mA, β = 250
  4. IB = 40 , IC = 5 mA, β = 125
Out of syllabusNEET 2018
3

The given electrical network is equivalent to [figure]

  1. OR gate
  2. NOR gate
  3. NOT gate
  4. AND gate
NEET 2017
4

Which one of the following represents forward bias diode ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2017
5

In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 k . If current gain is 100 and the base resistance is 2 k , the voltage and power gain of the amplifier is

  1. 15 and 200
  2. 150 and 15000
  3. 20 and 2000
  4. 200 and 1000
Out of syllabusNEET 2017
6

To get output 1 for the following circuit, the correct choice for the input is [figure]

  1. A = 1, B = 1, C = 0
  2. A = 1, B = 0, C = 1
  3. A = 0, B = 1, C = 0
  4. A = 1, B = 0, C = 0
NEET 2016 (Phase 1)
7

Consider the junction diode as ideal. The value of current flowing through AB is [figure]

  1. 10-1 A
  2. 10-3 A
  3. 0 A
  4. 10-2 A
NEET 2016 (Phase 1)
8

A npn transistor is connected in common emitter configuration in a given amplifier. A load resistance of 800 is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuit is 192 , the voltage gain and the power gain of the amplifier will respectively be

  1. 4, 4
  2. 4, 3.69
  3. 4, 3.84
  4. 3.69, 3.84
Out of syllabusNEET 2016 (Phase 1)
9

The given circuit has two ideal diodes connected as shown in the figure. The current flowing through the resistance R1 will be [figure]

  1. 2.5 A
  2. 10.0 A
  3. 1.43 A
  4. 3.13 A
NEET 2016 (Phase 2)
10

What is the output Y in the following circuit, when all the three inputs A, B, C are first 0 and then 1? [figure]

  1. 0, 1
  2. 0, 0
  3. 1, 0
  4. 1, 1
NEET 2016 (Phase 2)
11

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 k is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is 1 k , then the input signal voltage is

  1. 10 mV
  2. 20 mV
  3. 30 mV
  4. 15 mV
Out of syllabusNEET 2016 (Phase 2)

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