Homework chapter one:-H.W. 1.1: it is required to maintain a loading of 5 kW in a heating unit. At an initialtemperature of 15 C°, a voltage of 200 V is necessary for this purpose. When the unit issettled down to a steady temperature, a voltage of 220 V is required to maintain the sameloading. Estimate the final temperature of the heating element, if the resistancetemperature coefficient of the heating element is 0.0006 per C° at 0 C°.H.W. 1.2: Determine the current flowing at the instant of switching a 60 watt lamp on a230 V supply. The ambient temperature is 25 C°. The filament temperature is 2000 C°and the resistance temperature coefficient is 0.005 /C° at 0 Co.H.W. 1.3: At 0 C°, a specimen of copper wire has its resistance equal to 4-milliohm andits temperature coefficient of resistance equal to (1/234.5) per Co. Find the values of itsresistance and temperature coefficient of resistance at 70 C°.H.W. 1.4: At 0 C°, the resistances and their temperature coefficients of resistance of tworesistors 'A and 'B' are 80 ohm and 120 ohm, and 0.0038 per C° and 0.0018 per Co,respectively. Find the temperature-coefficient of resistance at 0 C° of their seriescombination.H.W. 1.5: A D.C. shunt motor, after running several hours on constant voltage of 400 V,takes field current of 1.6 A. If temperature rise is 40 C°, what value of extra resistance isrequired in field circuit to maintain field current equal to 1.6 A. Assume motor startedfrom cold at 20 C° and a20 = 00043/C°.1

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Homework chapter one:- H.W. 1.1: it is required to maintain a loading of 5 kW in a heating unit. At an initial temperature of 15 C°, a voltage of 200 V is necessary for this purpose. When the unit is settled down to a steady temperature, a voltage of 220 V is required to maintain the same loading. Estimate the final temperature of the heating element, if the resistance temperature coefficient of the heating element is 0.0006 per C° at 0 C°.

Homework chapter one:- H.W. 1.1: it is required to maintain a loading of 5 kW in a heating unit. At an initial temperature of 15 C°, a voltage of 200 V is necessary for this purpose. When the unit is settled down to a steady temperature, a voltage of 220 V is required to maintain the same loading. Estimate the final temperature of the heating element, if the resistance temperature coefficient of the heating element is 0.0006 per C° at 0 C°.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

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