How can we increase the efficiency of Otto cycle? Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. Higher compression ratio. We need new cycles put into practical use. Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work […]
What is freshman junior/sophomore senior?
What is freshman junior/sophomore senior? You might sometimes hear this shortened to “frosh.” (2) sophomore year, and someone in their second year is a sophomore. These same terms apply in the same way to the four years of a standard high school: 9th grade is freshman year, 10th grade sophomore year, 11th grade junior year, […]
What inventions were created by the Roman Empire?
What inventions were created by the Roman Empire? Top 10 Ancient Roman Inventions Arches. Grid-based cities. Sewers and Sanitation. Roads and Highways. Aqueducts. Roman Numerals. Surgery Tools and Techniques. Julian Calendar. Which two innovations did the Romans introduce into architecture? 8 Innovations of Roman Architecture The arch and the vault. The Romans did not invent […]
What is the value of the thermal conductivity of glass in W m k?
What is the value of the thermal conductivity of glass in W m k? Thermal Conductivity Material Thermal conductivity (cal/sec)/(cm2 C/cm) Thermal conductivity (W/m K)* Glass,ordinary 0.0025 0.8 Concrete 0.002 0.8 Water at 20° C 0.0014 0.6 Asbestos 0.0004 0.08 What are the SI units for thermal conductivity k? In the International System of Units […]
What is boundary layer concept?
What is boundary layer concept? Boundary layer, in fluid mechanics, thin layer of a flowing gas or liquid in contact with a surface such as that of an airplane wing or of the inside of a pipe. The flow in such boundary layers is generally laminar at the leading or upstream portion and turbulent in […]
What type of stresses the material experiences if it is subjected to torsion?
What type of stresses the material experiences if it is subjected to torsion? Torque on a shaft causes shear stress. The torsion, or twist, induced when torque is applied to a shaft causes a distribution of stress over the shaft’s cross-sectional area. (Note that this is different from tensile and compressive loads, which produce a […]
What is greenhouse operation?
What is greenhouse operation? The greenhouse operation requires the control of temperature, humidity and ventilation, using artificial heat sources, exhaust and inlet fans, shading (such as with movable slats or netting), cooling equipment (such as wet-pad or evaporative cooling), humidification and climate-control equipment (Jones 1978). What is greenhouse equipment? Equipment for greenhouses Screen. Help for […]
What are coarse thread screws used for?
What are coarse thread screws used for? Coarse-threaded screws are less likely to jam if the screw is inserted at an angle. Coarse-threaded screws are used in softer materials such as soft/hard wood, plastic or plasterboard. This is because their threads are able to grip the soft fibres of the material and hold the screw […]
Which phase of combustion takes place during expansion stroke?
Which phase of combustion takes place during expansion stroke? Combustion/Power/Expansion stroke The combustion stroke is the third phase, where the ignited air/fuel mixture expands and pushes the piston downwards. The force created by this expansion is what creates an engine’s power. Where does the piston begin in the four stroke cycle? The engine cycle begins […]
What determines the depth of a foundation?
What determines the depth of a foundation? The required depth of any foundation can depend on several factors: Soil bearing capacity. This determines how much load (weight or force) the existing soil can withstand. Soil type. How is excavation depth calculated? To transform this for use with our excavation, Ab will be the area of […]