How much lift will a symmetrical airfoil produce at zero angle of attack? A symmetrical wing has zero lift at 0 degrees angle of attack. The lift curve is also influenced by the wing shape, including its airfoil section and wing planform. A swept wing has a lower, flatter curve with a higher critical angle. […]
Why counter flow heat exchanger is more efficient?
Why counter flow heat exchanger is more efficient? Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path. For example, one fluid may make 2 passes, the other 4 passes. How does a […]
What is the divide and conquer approach to problem solving?
What is the divide and conquer approach to problem solving? A divide-and-conquer algorithm recursively breaks down a problem into two or more sub-problems of the same or related type, until these become simple enough to be solved directly. The solutions to the sub-problems are then combined to give a solution to the original problem. How […]
What can affect gas mileage?
What can affect gas mileage? How Your Driving Affects Fuel Economy Excessive Short Trips. Your engine works at its most efficient after it warms up. Frequent Cold Weather Travel. Heavy Braking or Acceleration. High Vehicle Weight or Towing Weight. Speeding. Fuel Injector Problems. Oil Type. Poor Maintenance. Why does gas mileage drop with new tires? […]
How is ethylene oxide formed?
How is ethylene oxide formed? Ethylene oxide can be produced by reacting oxygen (O2) and ethylene (C2H4) at temperatures of 200 – 300°C and pressures of 10 – 20 bara. The typical yield of this reaction is up to 80 – 90%. Is Ethylene Oxide an oxidizer? Historically, the most commonly used type of equipment […]
Why is measurement important in welding?
Why is measurement important in welding? Several welding projects require you to understand, calculate and measure welds at different angles accurately. Moderate knowledge of geometrical measurements will make it easier for you to connect metals together while advanced knowledge will make it possible to work on complex projects. Which of the following is the most […]
What is profile tolerance?
What is profile tolerance? In GD, profile tolerance defines a uniform boundary around a surface within which the elements of the surface must lie. Profile is a complex tolerance that simultaneously controls a feature’s form, size, orientation, and sometimes location. The top figure shows the profile tolerance applied to a curved surface. How many types […]
What is the maximum shear stress?
What are the chemical preservatives used for food preservation?
What are the chemical preservatives used for food preservation? What are common chemical preservatives? sorbic acid, sodium sorbate, sorbates: cheese, wine, baked goods, and more. benzoic acid, sodium benzoate, benzoates: jams, salad dressing, juices, pickles, carbonated drinks, soy sauce, and more. sulfur dioxide, sulfites: fruits, wines, and more. nitrites, nitrates: meats. What is the safest […]