5. The resistance of a cylindrical brass conductor, 0.5 cm diameter and 3 m long, is 0.0108 ohm. Determine resistance of a cylindrical conductor of the same material at the same temperature, and having a diameter of 0.25 cm and a length of 8 m. 6. The field windings of a series motor has a resistance of 120 ohms at 15 deg. C. After running for two hours, the resistance increases to 140 ohms. If the temperature coefficient of the windings at 0 deg. C is 0.004, find the new temperature of the windings.

5. The resistance of a cylindrical brass conductor, 0.5 cm diameter and 3 m long, is 0.0108 ohm. Determine resistance of a cylindrical conductor of the same material at the same temperature, and having a diameter of 0.25 cm and a length of 8 m. 6. The field windings of a series motor has a resistance of 120 ohms at 15 deg. C. After running for two hours, the resistance increases to 140 ohms. If the temperature coefficient of the windings at 0 deg. C is 0.004, find the new temperature of the windings.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...

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A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)
5. The resistance of a cylindrical brass conductor, 0.5 cm diameter and 3 m long, is 0.0108 ohm. Determine resistance of a cylindrical conductor of the same material at the same temperature, and having a diameter of 0.25 cm and a length of 8 m. 6. The field windings of a series motor has a resistance of 120 ohms at 15 deg. C. After running for two hours, the resistance increases to 140 ohms. If the temperature coefficient of the windings at 0 deg. C is 0.004, find the new temperature of the windings.
7. A coil having a resistance of 20 ohms and an inductance of 0.75 henry is connected in series with a 30-ohm resistor and to a 120-volt d-c source. A switch across the series resistor is then closed, and the circuit is assumed to be in a steady-state condition. At the instant the switch is opened, what will be the rate of current change and the power delivered by the magnetic field.
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