Fundamentals of Mechanical Engineering: Learn with Animation

Explore thermodynamics terminologies by defining state, process, path, and cycle using P-V diagrams and gas states, from state one to state two and back.

Explore the zeroth law of thermodynamics, which defines temperature through thermal equilibrium and shows how A and B reach equal temperature with a third body C, enabling thermometer-based measurements.

Explore the first law of thermodynamics as conservation of energy in thermodynamic processes, linking internal energy change to heat and work (delta e = q - w) with examples.

Explore thermodynamic systems by examining open, closed, and isolated types, focusing on boundaries, mass and energy transfer, with real-world examples.

Explore fossil fuels such as coal, oil, and gas. Learn how decomposition forms fuels and how carbon and hydrogen release energy in solid, liquid, or gaseous fuels.

Explore solid fuels—wood, peat, coal varieties (lignite, bituminous, anthracite) and artificial fuels like charcoal, coke, briquette coal, and pulverized coal, and their calorific values.

Explore types of liquid fuels, including natural and artificial categories, such as petroleum, petrol, kerosene, diesel, tar/benzene, and alcohol, with their distillation ranges, uses, and advantages and disadvantages.

Explore types of gaseous fuels, including natural gas, coal gas, coke gas, producer gas, water gas, and blast furnace gas, and compare their advantages and disadvantages.

Explore types of alternative fuels, focusing on CNG and LPG, and compare their storage, gaseous or liquid state, and emissions reductions for vehicles.

Define calorific value and compare higher and lower calorific value, detailing cooling of combustion products, heat carried away by steam, and LCV equals HCV minus latent heat of water.

Explore hydel energy, where moving water's kinetic energy generates electricity, with dams and plants delivering clean energy and accounting for 17% of world electricity and 70% of renewables.

Learn the principle of solar energy and its utilization through photovoltaics and solar technologies, with applications from rooftop systems to solar power plants and grid integration.

Explore global warming, a gradual increase in earth's temperature caused by greenhouse gases like carbon dioxide that trap heat.

Explain ozone depletion, its causes by chlorine and bromine from ozone depleting substances like CFCs, and how ultraviolet radiation and ozone layer thinning affect health and the environment.

Explain steam formation at one bar using a temperature versus enthalpy diagram, detailing sensible and latent heat, phase changes, saturation, dry saturated steam, and superheated steam.

Explore the three steam types—dry saturated steam, wet (two-phase) steam, and superheated steam—through a temperature–enthalpy diagram at constant pressure (1 bar), detailing dryness fraction and phase changes.

Learn how steam tables organize saturated and superheated properties in pressure- and temperature-based formats, including enthalpy, entropy, and specific volume, with a 10 bar dry saturated example.

Investigate steam properties at constant pressure. Derive wet steam enthalpy h_w = h_f + x h_fg and dry steam enthalpy h_g; evaluate superheated steam, volume, and flow work.

evaluate steam conditions from the steam table to determine dryness fraction 0.91 for 15 bar moist steam and recognize 10 bar at 200 degree celsius as superheated steam.

The lecture analyzes steam-table cases: case 1 identifies a wet steam at 20 bar with 2650 kJ/kg and finds x; case 2 yields dry saturated steam at 150 C.

Compute the enthalpy and internal energy of 1 kg of wet steam at 12 bar with dryness 0.8 using h = hf + x hfg and steam-table values.

Compute the enthalpy and internal energy of 1 kg of dry and saturated steam at 12 bar from steam table, yielding h_g ≈ 2782.7 kJ/kg and u ≈ 2586.85 kJ/kg.

Calculate enthalpy and internal energy of one kilogram of steam at 12 bar, superheated to 280 C, using steam tables; obtain h = 2975.9 kJ/kg and u = 2740.9 kJ/kg.

Using the steam table, determine that four kilograms of water at 20°C become superheated steam at 8 bar and 200°C. Compute heat via h_net = h_superheated − h_water.

Discover how the barrel calorimeter measures dryness fraction of steam by balancing heat lost from steam with heat gained by water and the calorimeter, including setup and limitations.

Learn how the separating calorimeter measures the dryness fraction of very wet steam by separating water from steam and using Ms and Mw.

Explore Boyle's law, also known as Mariotte's law, showing that pressure and volume are inversely related at constant temperature, with PV constant.

Illustrates Charles Law by linking volume and temperature at constant pressure, showing a P-V diagram and real-world examples like helium balloons shrinking.

Relates pressure, volume, and temperature through combined gas law and derives the characteristic gas equation. Explain characteristic gas constant and universal gas constant, including air value 0.287 kJ/kg-K.

Derive the relation Cp minus Cv equals R from constant-volume and constant-pressure heating using PV = mR T, and relate Cp and Cv to gamma and the gas constant.

Explains the isochoric (constant volume) process with a fixed piston, deriving how pressure, volume, and temperature relate, and showing zero work and formulas for heat, internal energy, and enthalpy changes.

Explore the isobaric (constant pressure) process, linking pressure, volume, and temperature on the P–V diagram, and derive work, internal energy change, heat transfer, and enthalpy.

Explore the isothermal process, mapping constant temperature behavior on a pressure–volume diagram, derive work via P dV with P1V1 = P2V2, and link heat transfer, internal energy, and enthalpy.

Explain flow and non flow processes, open versus closed boundaries, and classify non flow processes as isochoric, isobaric, isothermal, isentropic, and polytropic, with essential q, w, du, and dh formulas.

Explore the adiabatic process, the isentropic (reversible) case, no heat transfer, and insulation requirements, then derive pv^gamma = constant from the first law and gas equation.

Explore adiabatic (isentropic) processes, derive pv^gamma = constant and tv^{gamma-1} = constant, and apply Q = 0 to relate delta U and delta H to temperature changes.

Explore the polytropic process on the P–V diagram, covering isobaric, isochoric, isothermal, and adiabatic (isentropic) cases, with the polytropic index n ranging from 0 to infinity.

Heat engine converts chemical energy from fuel into thermal energy and work via a cyclic process, absorbing heat from a high-temperature source and rejecting to a sink.

Explore the heat engine cycle and key components, including working substance, heat source and sink, turbine and pump, and learn classification by place of combustion and machine type.

Explain the Carnot cycle as a reversible cycle with four steps—isothermal and adiabatic—depicted in PV and T-S diagrams, and show that its efficiency depends on heat source and sink temperatures.

Explore the practical limitations of the Carnot cycle, including non-ideal isothermal and adiabatic strokes, friction, weight of components, and the need for temperature differences in heat transfer.

Explore the Rankine cycle via its block diagram, detailing the boiler, turbine, condenser, and pump, and analyze PV and TS diagrams with saturated liquid and steam regions.

Explore air standard cycles as benchmarks for comparing heat engine cycles and define air standard efficiency using air as a perfect gas obeying gas law with constant specific heat.

Derive the Otto cycle efficiency from the p-v diagram by analyzing adiabatic compression and expansion with constant-volume heat addition and rejection, giving η = 1 − 1/r^{γ−1}.

An Otto cycle example analyzes adiabatic compression with r=10, T1=300 K, T3=1600 K, gamma=1.4, and Cv=0.717 kJ/kg K; it finds q_s ≈ 606.89 kJ and efficiency ≈ 60.18%.

Explore Otto cycle with an auto cycle example, deriving the compression ratio and efficiency from a P-V diagram, using data on minimum and maximum temperatures, heat input, and gamma 1.4.

This Otto cycle example solves for the maximum temperature after heat addition, using r=8, p1=1 bar, t1=15°C, gamma=1.4, and cv=0.718, then computes the air-standard efficiency.

explains the diesel cycle, its adiabatic compression and expansion, constant-pressure heat addition, and constant-volume heat rejection, and derives efficiency using compression ratio, cut-off ratio, and gamma.

This lecture explains the diesel cycle with a compression ratio of 15 and cut off ratio of 1.75, deriving the standard efficiency using gamma 1.4 and a pv diagram.

Demonstrates a diesel cycle example with adiabatic compression 16 and expansion 9, using a P–V diagram to find efficiency with gamma 1.4 and cutoff ratio 1.778.

Construct and analyze a diesel cycle example by drawing the P-V diagram, computing the compression ratio and cut-off ratio, and calculating the standard efficiency with gamma 1.4.

Identify key internal combustion engine components—valves, camshaft, spark plug, piston, piston rings, connecting rod, crankshaft, engine block, cylinder head, and flywheel—and their roles.

Explore essential ic engine terms, including bore, dead centers (tdc and bdc), inner and outer dead centers, stroke length, clearance and swept volumes, compression ratio, and piston speed.

Learn key IC engine performance parameters in this fundamentals of mechanical engineering course: indicated power, brake power, friction power, thermal and mechanical efficiencies, relative efficiency, and brake specific fuel consumption.

Explore the classification of internal combustion engines by fuel type, stroke, thermodynamic cycle, ignition, cooling, governing, speed, cylinders, arrangement, fuel supply, and valve location, illustrated with animation.

Explore the four-stroke petrol engine and its auto cycle, detailing suction, compression, power, and exhaust strokes, spark ignition, and the pressure–volume diagram representation.

Compare two stroke and four stroke engines across cycle completion, crankshaft revolutions, and power strokes, noting lighter versus heavier flywheels, compactness, and higher efficiency in four stroke designs.

Compare petrol and diesel engines across cycles, fuels, ignition, compression ratio, carburetor use, heat addition, efficiency, and suitability for light vs heavy duty use.

Learn centrifugal pump basics, including definition, main components such as impeller, volute casing, suction and delivery pipes, and how mechanical energy becomes pressure energy via centrifugal force.

Explore the fundamentals of a centrifugal pump through an engaging animation that illustrates operation principles and practical applications.

Explore the reciprocating pump, a positive displacement hydraulic device that converts mechanical energy into pressure energy, and review its piston, crank, valves, pipes, and suction–delivery strokes.

Compare centrifugal and reciprocating pumps: centrifugal offers low head with high discharge and smooth continuous flow, while reciprocating yields high head, low discharge, and pulsating flow with higher maintenance.

Watch an engaging animation that explains the reciprocating pump, its diagram, and operation, highlighting core mechanical engineering concepts.

Explore the basics of air compressors, including concept, parts, and the suction to delivery cycle with a P-v diagram, and review common applications such as tools, brakes, and spray painting.

Explore air compressor classification by principle, stages, pressure, and capacity. Identify positive displacement and dynamic types, including reciprocating, rotary, centrifugal, and axial compressors.

Explore the types of reciprocating and rotary air compressors, including classifications based on principle, piston size, arrangement, stages, and capacity, plus rotary lobed, screw, and vane designs.

Compare single-stage and multi-stage air compressors, and learn how intercooling and multiple cylinders enable higher pressure with reduced work and improved lubrication.

Compare rotary and reciprocating air compressors, detailing pressure limits, discharge rates, continuous versus intermittent air supply, size, lubrication impacts, efficiency, maintenance, and compression mechanisms.

Explore the function and requirements of couplings. Classify rigid and flexible types, including box, split muff, flange, pin type, universal, and Olum couplings, with animated visuals illustrating misalignment.

Explore muff, sleeve, or box coupling, a rigid connection that links aligned shafts using a hollow cast iron sleeve and keys, transmitting torque while highlighting its simplicity, safety, and limits.

Explore split mouth move coupling, a two-half sleeve clamped with bolts that connect axially aligned driving and driven shafts, transmit torque with keys, and summarize advantages and disadvantages.

Explore flange coupling, a rigid coupling that connects two axially aligned shafts to transmit power. Review its construction, working, and advantages and limitations.

Explore the pin bush flexible coupling that links two shafts, allowing lateral and angular misalignment via a bush between flanges and pins. Understand its construction, working, advantages, and limitations.

Explore the universal coupling, also known as hooke’s joint or cardan joint, a positive mechanical joint that transmits power between misaligned shafts via a cross and forks.

Explore the Oldham coupling, connecting driving and driven parallel shafts with a small offset using a central flange with tongues and perpendicular slots to transmit power in animation.

Explore the single plate clutch within the disc and plate clutch family, including its construction, working states (engaged and disengaged), and location between engine and gearbox for torque transmission.

Explore how a multiple plate clutch transmits torque from engine to gearbox, its compact, high-torque design, and applications in scooters, motorcycles, racing cars, and heavy commercial vehicles.

Explore the centrifugal clutch concept, its function, construction, and working between engine and gearbox, with shoes, springs, and drum, plus advantages, disadvantages, and applications.

Learn about types of brakes with a focus on block brakes, including single and double block brakes, their frictional resistance and applications in railways and automobiles.

Learn about simple and differential band brakes, their function and construction around a drum. See how lever action tightens the band to apply braking force and retard motion.

Explore the drum brake, an internal expanding shoe brake, covering its function, construction, working principle, and advantages and disadvantages, with notes on its use in trucks and parking brakes.

Explore the disc brake: its function, construction with rotor, pads, piston and caliper, and its working through animation, along with advantages, disadvantages, and practical applications in cars and bikes.