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1) A pot such made by Revere Copper ("Revereware") has two different metals composing the bottom of the pan- a stainless steel pan "body" with a copper base formed to the pan on the outside or burner contact surface. Why do you think this is done? Based on discussions in the book, do you think the heat transfer coefficient will be better with the copper bottom over the stainless steel pan, or is it there "just for show"? Would a bare stainless steel pan actually have a better heat transfer coefficient? Think this one through!
2) During a warmer winter or early spring day, wind at 40 deg.F is blowing at a speed of 40 mph parallel to a 12 foot high by 30 foot long wall of a house. Assuming the interior wall surface is 55 deg. F, find the rate of heat loss through the wall by convection.
3) You are working on a test using a 50 cm. long by 2 cm. diameter electric heating element. The element's exterior surface is polished aluminum (very low emissivity). The heating wire in the element is placed at the center of the tube and runs the length of the element. Both ends are well insulated, so you are only concerned with what happens at the cylinder surface. The element is powered with a constant 40 watt energy flow for the test period. If the surface temperature of the element is measured to be 120 deg.C and the surrounding air temperature is 20 deg. C, determine the natural convection heat transfer coefficient?
Q. Describes the construction of a 'Nicol Prism' and explains its action in converting UPL into PPL. Sol. Nicol Prism: This is the most simple and elegant polarizer and
what is radiation
Battery powered vehicles Used DC series motors are the first choice. Recently AC motors with frequency changers are being considered.
Electric and Magnetic Fields of an Oscillating Charge A 3 dimensional animation of the "far" fields of an oscillating charge. Electromagnetic radiation (EM radiation or EMR) is
Principle Ray III . Preliminary from the head of the arrow that the object is ray III travels directly toward the focal point on the other side of the lens. However at the plane of
Can multiple illuminators change colors simultaneously? Yes. Usually the standard disc rotating motors are of the synchronous form, very reliable, and geared to the most suffi
Cathode rays are made up of: (1) Positively charged particles (2) Negatively charged particles (3) Neutral particles (4) None of these Ans: (2)Negatively charged pa
Q. Dissimilarity between an intrinsic and extrinsic semiconductor? Answer:- Semiconductors permit only a little amount of light to pass through them. They are of two n-kin
Evaluate the speed of the block A 2.00-kg block is attached to a spring force constant 500N/n. The block is pulled 5.00 cm to the right of the equilibrium and released from rest
Contact forces: types of forces that result when the two interacting objects are apparent to be physically linking each other. Ex: frictional forces, tensional forces, normal f
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