What is draft in molding?

What is draft in molding? In engineering, draft is the amount of taper for molded or cast parts perpendicular to the parting line. By tapering the sides of the mold by an appropriate “draft angle”, for instance 2° (two degrees), the mold will be easier to remove. How do you calculate draft angle? When designing […]

What is max principal stress?

What is max principal stress? Maximum principal stress theory: This theory states that failure in any material occurs when the principal stress in that material due to any loading exceeds the principal stress at which failure occurs in the 1 dimensional loading test (universal tensile test in case of mild steel). Why are principal stresses […]

What is the working principle of microwave oven?

What is the working principle of microwave oven? A microwave oven uses microwaves, which are basically radio waves, to cook food. The commonly used frequency is roughly 2,500 MHz (2.5 GHz). Radio waves in this frequency range are absorbed by water, fats and sugars. When absorbed, they are converted directly into heat. What is the […]

Who uses psychrometric chart?

Who uses psychrometric chart? Psychrometric charts are complex graphs that can be used to assess the physical and thermodynamic properties of gas-vapour mixtures at a constant pressure. They are often used to assess the properties of moist air. What is psychrometric chart in HVAC? Psychrometric chart is one of the chart that is commonly used […]

What did the oil drop experiment determine?

What did the oil drop experiment determine? In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron. They suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces. Why was the oil drop experiment important? […]

How are folding doors used?

How are folding doors used? Folding doors can be used as internal or external room dividers and are made from a variety of materials. Most folding doors are glazed and the panels have frames of either wood, aluminium or upvc. They can open up and fold either internally or externally and are widely used in […]

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