A resistance oven employing nichrome wire is to beoperated from 220 V single phase supply and is to be rated at 16 kW.If the temperature of the element is to be limited to 1170 °C andaverage temperature of the charge is 500 °C, find the diameter and= 0.57,length of the element wire. Radiating efficiencyEmissivity=0.9, Specific resistance of nichrome = 1.09 x 10-6-m.

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Answered: A resistance oven employing nichrome…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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Similar questions

How many valence electrons are generally contained in materials used for insulators?
Nichrome ribbon resistor elements each has a resistance of 1 ohm. The element is made from sheet of nichrome alloy, 0.025 cm think. If the width of the ribbon is 0.3cm, what length is required per element in cm? Assume specific resistance of nichrome alloy to be 109microOhm-cm.
Nichrome ribbon resistor elements each has a resistance of 1 ohm. The element is made from sheet of nichrome alloy, 0.025cm thick. If the width of the ribbon is 0.3cm, what length is required per element? Assume specific resistance of nichrome allow to be 109micro ohm-cm.
PROBLEM 2 Two semiconductor materials A and B shown in the given figure, are made by doping germanium crystal with arsenic and indium respectively. The two are joined end connected to a battery as shown in figure. Is the junction forward biased or reverse biased? A B
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7. Each of three insulators forming a string has self-capacitance of "C farad. The shunt capacitance of each cap of msulator is 0 25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency.
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