Electrical Machines Q1 The no-load speed of a 240 V Dc shunt motor is 800 r/min and the armature currentis 2A. Determine the resistance in series with the field so that the speed of themachine is increased to 950 r/min when the armature current is 30 A. The shunt circuitand armature resistances are 160 ohms and 0.4 ohm respectively. Assume the fluxbeing directly proportional to the field current.

In this question, Find the additional shunt resistance to increase the speed of the motor from…

Answered: The no-load speed of a 240 V Dc shunt…

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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Create a short essay based on your own understanding and opinion about the question, “How does a dc generator work?”. Minimum of 150 words.
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Please answer in typing format
A. The brushes used in a DC generator a) ride against the commutator segments. b) are made from material softer than the commutator segments. c) are generally marked Al and A2 d) all of the above B. A magneto is a DC generator that uses for its pole pieces. a) electromagnets b) permanent magnets c) either "a" or "b" d) neither "a" nor "b"
Electrodynamic meters can measure ac signals only. A) True B) False
PLEASE HELP ME CHOOSE WHAT CORRECT LETTER OR ANSWER 4. The induced voltage in a single loop reverses a. once each revolution. b. once each half-revolution. c. twice each half-revolution. d. twice each revolution. e. three times each revolution. 5. Maximum voltage is induced in a single loop when the sides of the loop are passing a. perpendicular to the lines of force. 6. b. parallel to the lines of force. c. not quite perpendicular to the lines of force. d. at a slow rate of speed. e. in front of the N pole face. When a commutator is used on a single loop, the voltage at the brushes has a a. very large magnitude. b. changing polarity. c. constant polarity. d. zero value. e. constant value. 7. The left-hand generator rule is typically used to determine a. conductor speed. b. rotational direction. c. field direction. d. current direction. e. magnetic field strength.
consider the ID as 12345679
1. A coil wound 3000 turns in the form of an air-cored torus with a square cross section. The inner diameter of the torus is 60mm and the outer diameter is 100mm. The coil current is 0.3A. (a) Determine the maximum and minimum values of the magnetic field intensity within the toroidal coil. (b) Determine the magnetic flux within the torus. (c) Determine the average flux density across the torus and compare it with the flux density midway between the inner and outer edges of the coil.
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DC machines
A.C. with a frequency of 60 Hz. If the maximum value of the current is 120 amperes, write the equation for its instantaneous value. Calculate the time from when the value of the current rises from zero to positive (i) the value of the instantaneous current after 1/720 second and (2) the time for the value of the current to become 103.9 amperes for the first time.
The maximum value of the rate of change in potential with respect to position is equal toa. electric field b. electric flux density c. magnetic field strength d. magnetic field

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