Energy & Environment
Renewable energy, power plants, boilers and environmental engineering: how each technology works, where it is used, pros and cons.

Direct Energy Conversion: Methods, Working Principles and Applications
Direct energy conversion makes electricity with no turbine or generator: thermoelectric, thermionic, PV, fuel cell, MHD and RTG methods, with worked numbers.

Site Selection for Hydroelectric Power Plants: Head, Flow, Catchment and Geology
Site selection of a hydro power plant: head and flow, catchment and runoff, storage, dam geology, silt and environment, with worked power and flow sums.

Site Selection for Nuclear Power Plant
Site selection for a nuclear power plant in India: AERB siting code, 1 km, 5 km and 16 km zones, faults, floods, tsunami, cooling water and example sites.

Site Selection for Thermal Power Plant
Site selection for a thermal power plant: coal supply, cooling water, ash disposal, land, emission rules and grid, with worked numbers for a 1000 MW plant.

Difference Between Renewable and Non-Renewable Resources
Renewable resources (sun, wind, water, biomass) replenish naturally; coal, oil, gas and uranium run out. Differences table, examples, pros and cons.

Layers of Atmosphere: The 5 Main Layers, Their Altitudes, Temperatures and Features
The 5 layers of the atmosphere with altitudes, temperatures and features, why some books list 6, lapse rate and pressure examples, and the outer layer.

EDSAC Full Form: Electronic Delay Storage Automatic Calculator
EDSAC full form is Electronic Delay Storage Automatic Calculator, the 1949 Cambridge stored-program computer. Key facts, memory, history and legacy.

ISMC Full Form: Indian Standard Medium Channel, Sizes and Uses
ISMC full form is Indian Standard Medium Channel, a C-shaped steel section to IS 808. Size and weight table (ISMC 75 to 400), ISMC vs ISMB and common uses.

After the 12th, Which Engineering Branch Should I Choose and Why?
Pick an engineering branch after 12th by matching your PCM strengths to what each branch studies in years 2-4, its careers and recruiters, and your rank.

Role of an Individual in the Conservation of Natural Resources
The role of an individual in conservation of natural resources, resource by resource: water, energy, forests, soil, minerals and food, with the 5 Rs.

Types of Solar Panels: Monocrystalline, Polycrystalline and Thin-Film Compared
Types of solar panels: monocrystalline (PERC, TOPCon, HJT), polycrystalline and thin-film. Efficiency, cost, lifespan, rooftop sizing, which to buy.

Constructional Details of a Biogas Plant: Parts, Materials and Sizing
Biogas plant construction explained: floating drum (KVIC) vs fixed dome (Deenbandhu), parts, materials, site selection, a worked sizing example and faults.