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A thin-walled tube of 20-mm diameter passes hot fluid at a mean temperature of 45°C in an experimental flow loop. The tube is mounted horizontally in quiescent air at a temperature of 15°C. To satisfy the stringent temperature control requirements of the experiment, it was decided to wind thin electrical heating tape on the outer surface of the tube to prevent heat loss from the hot fluid to the ambient air.
(a) Neglecting radiation heat loss, calculate the heat flux q; that must be supplied by the electrical tape to ensure a uniform fluid temperature.
(b) Assuming the emissivity of the tape is 0.95 and the surroundings are also at 15°C, calculate the required heat flux.
(c) The heat loss may be reduced by wrapping the heating tape in a layer of insulation. For 85% magnesia insulation (k = 0.050 W/m · K) having a surface emissivity of 8 = 0.60, compute and plot the required heat flux q; as a function of insulation thickness in the range from 0 to 20 mm. For this range, compute and plot the convection and radiation heat rates per unit tube length as a function of insulation thickness.
Implement the truth table shown below using the minimum number of NAND gates. Use 2-, 3- , and/or 4-input NAND gates as required to minimize gates. Develop a logic circuit, using only NAND gates, to implement a circuit.
Write and test a program for the EASy68k to input a string from the keyboard, convert all letters to uppercase and echo (output) the new string to the screen. Use a subroutine to perform the lower-to-upper case conversion.
Two charged particles, Q1 = +5.50 nC and Q2 = -3.40 nC, are separated by 39.0 cm. (a) What is the electrical potential energy of the pair (b) What is the electric potential at a point midway between the charged particles
Through the data sheet the power meter is 4.5 HP. Find the hp range for PH-3A-HG in hp. The power meter measures the power and outputs a 0 - 10 voltage signal. Calculate the conversion factor for converting the voltage output from the sensor into ..
Develop the VHDL text file for a binary down-counter to divide a frequency by 32. Use Q as the outputs and CLK as the falling edge clock input.
The total complex power delivered to the Y-connected 3-phase balanced load is 1152+j864 KVA. The line voltage at the terminal ofthe load is 4160V. a) Find the magnitude of the line current feeding the load.
A conducting sphere in free space has a radius of a= 10cm. the capacitance of the isolated sphere is C= 4oa. now let's coat the sphere with a dielectric with fr= 3, and the thickness of the dielectric layer is d.
An electron is bound in a one-dimensional infinite potential well with a width of 5Å. (a) Calculate the first three energy levels that the electron may occupy. (b) If the electron drops from the third to the second energy level
The upper side frequency of an AM signal is 603 KHz. If the carrier frequency is 600 KHz, what is the intelligence frequency
1. A sinusoidal waveform is described by the equation: v(t) = 20V sin(120pit) pi = 3.1416 What is the value of the frequency 2. A sinusoidal waveform is described by the equation
The capacitance of a capacitor formed by two parallel metal plates each 200 cm2 in area separated by a dielectric 4 mm thick is 0.0004 microfarads. A p.d. of 20,000 V is applied. Calculate (a) the total charge on the plates
A series circuit with R =2 ohm, L = 2 mH, and C =500 mF has a current which increases linearly from zero to 10A in the interval 0
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