Tunnel Diodes and its Characteristics MCQ

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• What happens to a tunnel diode when the reverse bias effect goes beyond the valley point?
  ক

  it behaves as a normal diode

  খ

  it attains increased negative slope effects

  গ

  reverse saturation current increases

  ঘ

  beacomes independent of temperature
• In the construction of tunnnel diode,why is the pellet soldered to anode contact and a tindot to cathode contact via a mesh screen?
  ক

  for better conduction and reduce inductance respectively

  খ

  for heat dissipation and increase conduction respectively

  গ

  for heat dissipation and reduce induction respectively

  ঘ

  for better conduction and reduce inductance respectively
• For a tunnel diode, when ‘p’ is probability that carrier crosses the barrier, ’e’ is energy,’w’ is width.
  ক

  p ∝ e(-A*e*w)

  খ

  p ∝ 1/ e(-A*e*w)

  গ

  p ∝ e(A*e*w)

  ঘ

  p ∝ 1/e(A*e*w)
• Tunnel diodes are made up of________
  ক

  Germanium and silicon materials

  খ

  AlGaAs

  গ

  AlGaInP

  ঘ

  ZnTe
• The tunnneling involves_______
  ক

  acceleration of electrons in p side

  খ

  movement of electrons from n side conduction band to p side valance band

  গ

  charge distribution managementin both the bands

  ঘ

  positive slope characteristics of diode
• With interments of reverse bias, the tunnel current also increases because________
  ক

  electrons move from balance band of pside to conduction band of nside

  খ

  fermi level of pside becomes higher than that of nside

  গ

  junction currrent decreases

  ঘ

  unequality of n and p bandedge
• The depletion layer of tunnel diode is very small beacause______
  ক

  its abrupt and has high dopants

  খ

  uses positive conductance property

  গ

  its used for high frequency ranges

  ঘ

  tunneling effect
• Which of the following are true about a tunnel diode? 1) it uses negative conductance property 2) it operates at high frequency 3) fermilevel of p side becomes higher than the n side in forward bias
  ক

  1 only

  খ

  1 and 2

  গ

  3 only

  ঘ

  2 and 3
• Tunnel diode has a very fast operation in__________
  ক

  gamma frequency region

  খ

  ultraviolet frequency region

  গ

  microwave frequency region

  ঘ

  radio frequency region
• If ‘X’ corresponds to a tunnel diode and ‘Y’ to an avalanche diode, then__________
  ক

  X operates in reverse bias and Y operates in forward bias

  খ

  X operates in reverse bias and Y operates in reverse bias

  গ

  X operates in forward bias and Y operates in forward bias

  ঘ

  X operates in forward bias and Y operates in reverse bias