EX-504-C Electrical and Electronics Materials - Dec 2024 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aDescribe crystal structure of materials.
   How to answer

   • Definition of crystal and crystal structure
   • Unit cell, lattice, Bravais lattices
   • Common structures: SC, BCC, FCC, HCP with examples
   • Coordination number and packing factor
2. 7 Marks
   bDistinguish between Metals and Alloys.
   How to answer

   • Definition of metals
   • Definition of alloys with examples
   • Composition and microstructure differences
   • Property comparison in table form
3. 7 Marks
   aExplain ceramic materials with examples.
   How to answer

   • Definition of ceramic materials
   • Classification: oxides, carbides, nitrides
   • Examples with applications
   • General properties
4. 7 Marks
   bDescribe the basic properties of conductors.
   How to answer

   • Definition of conductor
   • High conductivity and low resistivity
   • Mechanical and thermal properties
   • Examples of conducting materials
5. 7 Marks
   aDefine Dielectric loss and dissipation factor.
   How to answer

   • Definition of dielectric loss
   • Definition of dissipation factor / tan delta
   • Formula relating loss angle and power loss
   • Significance in insulating materials
6. 7 Marks
   bExplain various factors affecting dielectric strength.
   How to answer

   • Concept of dielectric strength and breakdown
   • Effect of temperature, moisture, thickness
   • Effect of frequency, impurities, ageing
   • Effect of voids and environmental conditions
7. 7 Marks
   aDefine trivalent impurities. Give applications of semiconductor.
   How to answer

   • Definition of trivalent impurities with examples
   • P-type doping mechanism
   • Common applications of semiconductors
   • Examples: diodes, transistors, ICs
8. 7 Marks
   bDraw and explain energy band diagrams for conductor and semiconductor.
   How to answer

   • Energy band concept: valence, conduction, forbidden gap
   • Neat band diagram for conductor
   • Neat band diagram for semiconductor
   • Explanation of conductivity difference
9. 7 Marks
   aCompare the intrinsic and extrinsic semiconductors.
   How to answer

   • Definition of intrinsic and extrinsic semiconductors
   • Comparison of doping, carrier concentration
   • Comparison of conductivity and temperature dependence
   • Examples and applications
10. 7 Marks
    bDiscuss the characteristics of semiconductor laser.
    How to answer

    • Principle of semiconductor laser
    • Construction and active medium
    • Characteristics: coherence, directionality, efficiency
    • Applications
11. 7 Marks
    aClassify the magnetic materials with their properties.
    How to answer

    • Classification: diamagnetic, paramagnetic, ferromagnetic
    • Antiferromagnetic and ferrimagnetic materials
    • Properties: susceptibility, permeability
    • Examples for each class
12. 7 Marks
    bExplain the factors affecting permeability and hysteresis.
    How to answer

    • Definition of permeability and hysteresis
    • Effect of composition and grain structure
    • Effect of temperature, stress, impurities
    • Effect of frequency and heat treatment
13. 7 Marks
    aDiscuss Nanomaterials in brief.
    How to answer

    • Definition and scale of nanomaterials
    • Classification: 0D, 1D, 2D
    • Properties: high surface area, quantum effects
    • Applications in electronics
14. 7 Marks
    bDescribe ultralight material and metallic foams.
    How to answer

    • Concept of ultralight materials
    • Definition and structure of metallic foams
    • Properties: low density, high strength
    • Applications
15. 14 Marks
    Write short note :

    1. a)LCD
    2. b)Polymers
    3. c)Hall effect
    4. d)Register types
    How to answer

    • LCD: principle, construction and working
    • Polymers: classification and electrical applications
    • Hall effect: principle, formula and applications
    • Register types: SISO, SIPO, PISO, PIPO