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Semiconductor Electronics · Question 29

NEET (UG) 2019MCQMedium📈 Topic in 75% papers+4−1
1

The correct Boolean operation represented by the circuit diagram drawn is : [figure]

  1. OR
  2. NAND
  3. NOR
  4. AND

Answer

(2) NAND

Solution

Take switch position 1 as closed (input 1) and position 0 as open (input 0). The switches A and B are in series between the junction above the LED and the earth.

If A = 0 or B = 0 (or both), the path through the switches is open; current flows through the resistors and the LED glows Y = 1.

If A = 1 and B = 1, the junction is connected directly to the earth, the LED is short-circuited Y = 0.

Truth table (A, B → Y): (0, 0) → 1, (0, 1) → 1, (1, 0) → 1, (1, 1) → 0

Y = A B, i.e. NAND operation.

Answer: (2)

NEET (UG) 2019

Keep practising — Semiconductor Electronics

2

For a p-type semiconductor, which of the following statements is true?

  1. Holes are the majority carriers and trivalent atoms are the dopants.
  2. Holes are the majority carriers and pentavalent atoms are the dopants.
  3. Electrons are the majority carriers and pentavalent atoms are the dopants.
  4. Electrons are the majority carriers and trivalent atoms are the dopants.
NEET (UG) 2019
3

In the combination of the following gates the output Y can be written in terms of inputs A and B as [figure]

  1. A.B
  2. A. B + A.B
  3. A. B + A.B
  4. A + B
NEET 2018
4

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
NEET 2018
5

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
6

The given electrical network is equivalent to [figure]

  1. OR gate
  2. NOR gate
  3. NOT gate
  4. AND gate
NEET 2017
7

Which one of the following represents forward bias diode ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2017
8

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
9

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)
10

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)
11

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)

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