Download DBATU B-Tech 1st Year 2017 Oct Basic Electronic Engineering Question Paper

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DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE - RAIGAD - 402 103

Mid Semester Examination - October - 2017

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Subject with Subject Code: Basic Electronics Engineering (EXE105) Marks: 20

Date: October 5, 2017 Time: 1 Hr.

Instructions:

1. All questions are compulsory
2. Figures to the right indicate marks

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3. Assume suitable data whenever necessary

Q. 1. Write the appropriate choice for the following questions (06)

1. The diameter of an atom ranges from about
   1. 1x10^-10m to 5x10^-10m
   2. 1x10^-8cm to 5x10^-8cm
   3. 1x10^-10mm to 5x10^-10mm

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   4. 1x10^-9m to 5x10^-9m
2. Which of the material whose conductivity falls between those of conductors and insulators:
   1. Gold
   2. Germanium
   3. Silver

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   4. Teflon
3. Which of the trivalent impurity material has 3 valence electrons?
   1. Arsenic
   2. Gallium
   3. Antimony

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   4. Bismuth
4. Complete transfer of one or more electrons from one atom to different atom forms
   1. ionic bonds
   2. covalent bonds
   3. metallic bonding

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   4. co-ordinate bonding
5. The total energy of revolution of a revolving electron in an atom can
   1. Have any value above zero
   2. never be positive
   3. never be negative

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   4. not be calculated
6. Pairs of outer shell electrons not used in bonding are called as
   1. valence electrons
   2. lone electrons
   3. electrovalent electrons

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   4. lone pairs

Q. 2. Attempt any one of the following: (06)

1. Explain the ionic bond and covalent bond of the atom.
2. Discuss the intrinsic and extrinsic semiconductors.

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Q. 3. Attempt any two of the following (08)

1. Draw and explain the energy band structure of metals, semiconductors and insulators.
2. Explain the concept of Fermi energy level in p-type semiconductor
3. Explain the zener breakdown and avalanche breakdown.

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