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MCQs

Total Questions : 90 | Page 5 of 9 pages
Question 41. The most commonly used semiconductor material is
  1.    Silicon
  2.    Germanium
  3.    Mixture of silicon and germanium
  4.    None of the above
 Discuss Question
Answer: Option A. -> Silicon
Question 42. Permalloy is
  1.    A variety of stainless steel
  2.    A polymer
  3.    A conon-ferrous alloy used in aircraft industry
  4.    A nickel an iron alloy having high permeability
 Discuss Question
Answer: Option D. -> A nickel an iron alloy having high permeability
Question 43. In which of these is reverse recovery time nearly zero?
  1.    Zener diode
  2.    Tunnel diode
  3.    Schottky diode
  4.    PIN diode
 Discuss Question
Answer: Option C. -> Schottky diode
Question 44. Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
  1.    Normal to both current and magnetic field
  2.    In the direction of current
  3.    Antiparallel to magnetic field
  4.    In arbitrary direction
 Discuss Question
Answer: Option A. -> Normal to both current and magnetic field
Question 45. Which one of the following is not a characteristic of a ferroelectric material?
  1.    High dielectric constant
  2.    No hysteresis
  3.    Ferroelectric characteristic only above the curie point
  4.    Electric dipole moment
 Discuss Question
Answer: Option C. -> Ferroelectric characteristic only above the curie point
Question 46. Fermi level is the amount of energy in which
  1.    A hole can have at room temperature
  2.    An electron can have at room temperature
  3.    Must be given to an electron move to conduction band
  4.    None of the above
 Discuss Question
Answer: Option C. -> Must be given to an electron move to conduction band
Question 47. In monolithic ICs, all the components are fabricated by
  1.    Diffusion process
  2.    Oxidation
  3.    Evaporation
  4.    None
 Discuss Question
Answer: Option A. -> Diffusion process
Question 48. When diodes are connected in series to increase voltage rating the peak inverse voltage per junction
  1.    should not exceed half the breakdown voltage
  2.    should not exceed the breakdown voltage
  3.    should not exceed one third the breakdown voltage
  4.    may be equal to or less than breakdown voltage
 Discuss Question
Answer: Option C. -> should not exceed one third the breakdown voltage
Question 49. Assertion (A): A JFET can be used as a current source.Reason (R): In beyond pinch off region the current in JFET is nearly constant.
  1.    A is false but R is true
  2.    Both A and R are true but R is not a correct explanation of A
  3.    Both A and R are true and R is correct explanation of A
  4.    A is true but R is false
 Discuss Question
Answer: Option C. -> Both A and R are true and R is correct explanation of A
Question 50. For a NPN bipolar transistor, what is the main stream of current in the base region?
  1.    Drift of electrons
  2.    Diffusion of holes
  3.    Drift of holes
  4.    Diffusion of electrons
 Discuss Question
Answer: Option B. -> Diffusion of holes

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