 A certain series-wound motor is tested with a Prony brake, the distance from the center of the shaft to the point where the arm of the brake rests on the scale platform being 36 inches. The brake is tightened until the pressure on the platform is 27...  A Textbook on Mining Engineering - Σελίδα 41900Πλήρης προβολή - Σχετικά με αυτό το βιβλίο
 | International Correspondence Schools - 1897 - 556 σελίδες
...give a constant current ? (1200) What is the effective strength of an alternating current ? (1201) A certain series-wound motor is tested with a Prony...Current to motor, 25 amperes; volts at terminals, 430; speed, 900 RPM (a) What is the output of the motor in HP ? (b) What is its efficiency at this... | |
 | Charles Philo Matthews, John Sanford Shearer - 1897 - 272 σελίδες
...(prd&. [Where Fr =/(0). 243. A shaft s turns 120 times per minute. The radius of the shaft is 2 cm. The distance from the center of the shaft to the point where the mass is applied is 2 m. It requires a mass of 80 kg. to hold the lever in equilibrium. Find the work... | |
 | International Correspondence Schools - 1899 - 560 σελίδες
...give a constant current ? (1200) What is the effective strength of an alternating cut rent ? (1201) A certain series-wound motor is tested with a Prony...tightened until the pressure on the platform is 27 Ib. , when the following readings are taken: Current to motor, 25 amperes; volts at terminals, 480;... | |
 | International Correspondence Schools - 1900 - 724 σελίδες
...notice of the copyright, see page immediately following the title page. (11) How is the Thomson- Houston constant-current dynamo regulated to give a constant...tightened until the pressure on the platform is 27 Ib., when the following readings are taken: Current to motor, 25 amperes; volts at terminals, 430;... | |
 | International Correspondence Schools - 1901 - 544 σελίδες
...? (3) How is the Thomson-Houston constant-current dynamo regulated to give a constant current ? (4) A certain series-wound motor is tested with a Prony...tightened until the pressure on the platform is 27 pounds, when the following readings are taken : Current to motor, 25 amperes; volts at terminals, 4•S0:... | |
 | George Defrees Shepardson - 1901 - 782 σελίδες
...downward thrust when the motor attempts to start; the scales then weigh the pull at a radius equal to the distance from the center of the shaft to the point where the lever touches the platform. There are several forms of transmission-dynamometer for measuring the amount... | |
 | 1911 - 1132 σελίδες
...be measured, but it is unnecessary to do so, for if we consider the pulley to have a radius equal to the distance from the center of the shaft to the point where the arm exerts its downward pressure the same result will be obtained. The power may then be calculated as... | |
 | 1911 - 1126 σελίδες
...arm bearing against a platform scale, and the pressure at the end of this radius arm multiplied by the distance from the center of the shaft to the point where the radius arm bears on the scale, is the moment of the force exerted in accelerating and retarding the... | |
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