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A long, uninsulated steam line with a diameter of 89 mm and a surface emissivity of 0.8 transports steam at 200°C and is exposed to atmospheric air and large surroundings at an equivalent temperature of 20°C.
(a) Calculate the heat loss per unit length for a calm day.
(b) Calculate the heat loss on a breezy day when the wind speed is 8 m/s.
(c) For the conditions of part (a), calculate the heat loss with a 20-mm-thick layer of insulation (k = 0.08 W/m· K). Would the heat loss change significantly with an appreciable wind speed?
What is the inductance if you assume the inner conductor to be a very thin shell with outer diameter 0.5 mm instead of a solid conductor?
Calculate the resistance of the armature circuit and the field circuit.
A Carnot engine receives 250 kW of heat from a heat-source reservoir at 798.15 K (525°C) and rejects heat to a heat-sink reservoir at 323.15 K (50°C). What are the power developed and the heat rejected?
Write a MATLAB function that, given the system statespace matrices A, B, and C, the desired closed-loop poles, and the observer poles, determines the closed-loop system statespace matrices of a full-observer state feedback system with integral act..
Calculate the potential and electric field intensity everywhere inside the capacitor using a one-dimensional finite differences method.
Is such a control scheme feasible? What would the designers need to do to eliminate potential problems?
A balanced three-phase, wye-connected, 2400- V, 60-Hz source supplies two balanced wye connected loads in parallel. The first draws 15 kVA at 0.8 power factor lagging, and the second needs 20 kW at 0.9 power factor leading.
Consider the case of a rare mutant in which the concentration of solutes in the kidney medulla interstitial spaces is equal to the concentration of solutes in the liquid in thelumen of the medullary collecting duct in the kidney.
Find the rotor copper loss at full load and the speed at maximum torque. Compute the value of the per-phase rotor resistance (referred to the stator) that must be added in series to produce a starting torque equal to the maximum torque.
A scheme for concurrently heating separate water and air streams involves passing them through and over an array of tubes, respectively, while the tube wall is heated electrically. To enhance gas-side heat transfer, annular fins of rectangular pro..
Explain why the value of the normalized ratio (R) in a pulse oximeter is independent of the volume of arterial blood entering the tissue during systole.
An elementary second order adiabatic reaction A+ B CD ? + is taking place in a CSTR. The feed to the reactor is equimolar A and B at concentrations of 2.4 mol/liter. The entering temperature is 300 K.
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