Previous year question paper for ECM (Diploma Electronics & Communication Engineering 3rd)

1. Materials (32 hrs)

1.1Classification of materials: Conducting, semi-conducting and insulating

materials through a brief reference to their atomic structure.

1.2Conducting Materials: Resistivity and factors affecting resistivity.

Classification of conducting materials into low resistivity and high resistivity

materials.

1.3Insulating Materials:

- Electrical properties: Volume resistivity, surface resistance, dielectric loss,

dielectric strength (breakdown voltage) and dielectric constant.

-Thermal properties: Heat resistance, classification according to

temperature endurance, thermal conductivity.

- Brief introduction of the following materials and their applications. Mica,

Paper, Asbestos, Ceramic, Teflon, Acrylics, Silicon grease, Bakelite, Epoxy

Glass, Soldering Lead alloy.

1.4Magnetic Materials: Different Magnetic materials; (Dia, Para, Ferro) and

their properties. Ferro magnetism, Domains, permeability, Hysteresis loop.

Soft and hard, magnetic materials, their examples and typical applications.

1.5 Latest developments in Materials: Idea about latest materials in the light of

technological advancements like hybrid carbon, advanced ceramic , and

liquid crystals.

2. Components (32 hrs)

2.1 Capacitors:

a) Concept of capacitance and capacitors, units of capacitance, types of

capacitors, constructional details and testing specifications.

b) Capacity of parallel plate capacitors, spherical capacitors, cylindrical

capacitor.

c) Energy stored in a capacitor.

d) Concept of dielectric and its effects on capacitance, di-electric constant,

break down voltage. 

2.2Resistors: Carbon film, metal film, carbon composition, wound and variable

types (presets and potentiometers).

2.3Transformer, inductors and RF coils: Methods of manufacture, testing, Need

of shielding, application and trouble shooting.

2.4Surface Mounted Devices (SMDs): Constructional details and specifications.

2.5Connectors, Relays, switches and cables: Different types of connectors,

relays, switches and cables, their symbols, specifications, construction,

types, applications and their testing.

2.6 Semi Conductors and Integrated Circuits: Basic characteristics of

Semiconductor materials, diodes, transistors, FETs, and SCRs. Various

processes in IC manufacturing. Superconductivity and piezoelectric ceramic

transducer elements