5. The resistance of a copper wire at 30°C is 50 n. If the temperature coefficient of copper at 0°C is0.00427, what is the resistance at 100°C?C. 52.5°CA. 72.26 0B. 63.24 0D. 78.3°C6. A 120 V DC motor draws current of 100A and is located 1000ft from the supply source. If thediameter of the copper transmission line is 0.45 inch, what must be the voltage of the supply?A. 125.32VВ. 130.24Vс. 129.32VD. 127.05V

Resistance at any temperature = (resistance at zero degrre)×(1+ temperature coefficient of copper ×…

Answered: 5. The resistance of a copper wire at…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

If the machine is running at 1500 r.p.m. and the armature has 16 conductors per each slot. Assume that the generated voltage in each conductor is 3 volts and each one can carry a full load current of 2A (the machine is separately excited). Determine: The terminal voltages on no-load. The output current on full-load. The required flux per pole. viii) The power developed by the armature on full load and then; v) vi) vii)
The following data for a 1250 kVA, 0.8 p.f., 50 Hz, 3300 V, 300 rpm star connected alternator is available : Stator turns per phase 150 Field turns per pole Effective area per pole Airgap length at pole centre Field current for full load short circuit current ATS per pole for iron portion Assuming sinusoidal flux distribution, estimate the values of short circuit ratio and synchronous reactance. = = 60 = 0.09 m² = 5.5 mm = 80 A = 20% of airgap
Determine the flux per pole for 6 pole de machine having 240 wave connected conductors, which generates an open circuit voltage of 500 volt, which is running at 1000 rpm.
(a) Explain briefly what is fringing effect and leakage flux. (b) A ferromagnetic core is shown in Figure 1. The depth of the core is 10 cm. The other dimensions of the core are as shown in the figure. By assuming the magnetic leakage to be negligible and relative permeability of the core is 800. Calculate the total reluctance and find the value of the current that will produce a flux of 0.01 Wb. With this current, calculate the flux density at the top of the core 20 cm 40 cm 10 cm, 30 cm 500 turns 30 cm 30 cm Figure 1
A four-pole Series connected generator has a lap connected armature with 728 conductors. If the generator supplies one hundred incandescence lamp (100V, 60 W). The series field and armature resistance are 0.2 ohms and 0.015 ohms respectively. Find the generated voltage.
A 2 pole wave wound dc generator has 44 slots, each slot having 20 conductors. The flux/pole is 0.018 weber. At what speed the armature be rotated to get an induced emf of 220 V. What will be the induced emf developed if the armature winding is lap connected and runs at the same speed. Speed Generated Emf when lap connected
9.09 The flux density distribution in the air-gap of a certain generator is such that it contains a fundamental, a third harmonic, and a fifth harmonic. The flux per pole due to the fundamental distribution is 9 x 10-3 weber, that due to the third harmonic distribution is 0.9 x 10-3 weber, that due to the fifth harmonic distribution is 0.4 x 103 weber. There are four armature slots per phase per pole, the connection are made for three-phase wye. and the coil pitch is 12/15. The frequency is 60 cycles and the generator has 4 poles. (a) Calculate the emf/turn. (b) If there are six turns/coil and two coil sides/slot, calculate the emf per phase. (c) Calculate the emf between line terminals. Ans. 2.32V; 212V; 364V
A d.c. series generator supplies the load of 5 kW at 250 volts. The armature resistance and series field resistances are 1 ohm and 0.5 ohm respectively. Determine the value of the induced emf.
e = 0 Q1: What does happen if we change two currents? a. Q2: What does happen if we have a three-phase four poles machine? Q3: What does happen if we have a two-phase two poles machine? e = 0 Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali Ki. pw --
A 4 pole generator with wave wound armature has 50 slots each having 22 conductors. The flux per pole is 0.01 Wb. At what speed must the armature rotate to give an induced EMF of 220V is,
1. A shunt generator supplies a load of 4,500 W at 120 V through a pair feeder conductors having a resistance of 0.02 ohm each. The armature, shunt field resistance are 0.20 ohm and 40 ohm respectively. Find emf generated. The i lon wound with 450 conductors.
7. A 4-pole machine running at 1500 r.p.m. has an armature with 90 slots and 6 conductors per slot. The flux per pole is 10 mWb. Determine the terminal e.m.f. as d.c. Generator if the coils are lap-connected. If the current per conductor is 100 A, determine the electrical power. Subject: Electrical Machine 1

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