NEET Physics - New - Semiconductor Electronics and Devices

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Question - 1

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

  • A IB=20 μA, IC=5 mA, β=250
  • B IB=25 μA, IC=5 mA, β=200
  • C IB=40 μA, IC=10 mA, β=250
  • D IB=40 μA, IC=5 mA, β=125

Question - 2

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

  • A Does not affect resistance of p-n junction
  • B Affects only forward resistance
  • C Affects only reverse resistance
  • D Affects the overall V-I characteristics of P-N junction

Question - 3

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

  • A \(\overline { A.B } \)+A.B
  • B A.\(\bar { B } \)+\(\bar { A } \).B
  • C \(\overline { A.B } \)
  • D \(\overline { A+B } \)

Question - 4

The given electrical network is equivalent to:

  • A AND gate
  • B OR gate
  • C NOR gate
  • D NOT gate

Question - 5

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

  • A 200 and 1000
  • B 15 and 200
  • C 150 and 15000
  • D 20 and 2000

Question - 6

Which one of the following represents forward bias diode?

  • A
  • B
  • C
  • D

Question - 7

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

  • A 10 mV
  • B 20 mV
  • C 30 mV
  • D 15 mV

Question - 8

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

  • A 0,1
  • B 0,0
  • C 1,0
  • D 1,1

Question - 9

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

  • A 1.43 A
  • B 3.13 A
  • C 2.5 A
  • D 10.0 A

Question - 10

Toget output 1 for the following circuit, the correct choice for the input is:

  • A A = 0, B = 1, C = 0
  • B A = 1, B = 0, C = 0
  • C A = 1, B = 1, C = 0
  • D A = 1, B = 0, C = 1
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