Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 35
s, the weigh*W 12.4 pounds, and the speed 1,400 revolutions per minute. What hors««power was developed? Solution. Since R must be expressed in feet,T = 2.5 X 12.4. = 31 pound-feet. Substituting this vakie of T in Equation 6, gives: 2 X 3.1416 X 31 X 1,400 Horse-Power 33,000EXAMPLE FOR PRACTICE =… … —-e _1 — yy. / Fig. 8. Armature Reaction in Motor. and the wing-nuts adjusted until the current is 25 amperes, the speedis 755 revolutions per minute; and IF = 36 pounds. What is (a)the actual horse-power needed to drive the machine; and (6) theefficiency of the motor? Ans. 13.8 horse-power,…
Electrical engineering
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