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Electric railway troubles and how to find them; a comprehensive treatise on motors, motor operation, motor repairs, car break-downs, control systems, ... and electric railway operation generally
Paul Emilius Lowe
Paperback. RareBooksClub.com 2012-05-14.
ISBN 9781231709870
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Förlagets beskrivning
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...It is liable to cause short circuit in armature coils; a short circuit is produced in the controller and the fuse in circuit is melted. Q. 59. In electric railroading, what is the ordinary voltage on line? A. 550 volts. Q. 60. What is the positive side of a circuit? What is the negative side of a circuit? A. The positive or plus side is that side of a circuit through which the circuit flows in to it. The negative or minus side of a circuit is the side by which the current leaves it. The positive side of the circuit is the trolley, and the negative the rail in electric railroading. Q. 61. Describe the pole piece of a motor? Are the iron magnets inside of the motor shell temporary, or permanent magnets? If they are temporary, why? and when do they cease to act as magnets? A. The iron magnets inside the shell are called the motor pieces, and they are temporary, being magnetized--or becoming magnets--when energized by the surrounding field coils, and when the power ceases they cease to be magnets. Q. 62. How many pole pieces are there usually in each motor? A. Four. Q. 63. By what names are they known, to distinguish one from the other? A. North pole, and south pole. Q. 64. If a motor has four pole pieces, why are there two of them north poles and two of them south poles? A. To permit the attraction and repulsion of an armature the magnetic field must be evenly balanced in polarity, and therefore the number of negative and positive poles must be equal. Q. 65. How does the attraction, and repulsion of an armature affect the movement of a car? A. It causes the revolution of the armature, which in turn causes the propulsion of the car, the pinion on the armature shaft engaging the gear on the truck, and causing it to revolve, which turns the wheels. Q. 66. What is
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Electric railway troubles and how to find them; a comprehensive treatise on motors, motor operation, motor repairs, car break-downs, control systems, ... and electric railway operation generally
Bokrecensioner » Electric railway troubles and how to find them; a comprehensive treatise on motors, motor operation, motor repairs, car break-downs, control systems, ... and electric railway operation generally
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