Audels Answers on Practical Engineering for Engineers, Firemen, Machinists, and Those Desiring to Acquire a Working Knowledge of the Theory and Practi

Audels Answers on Practical Engineering for Engineers, Firemen, Machinists, and Those Desiring to Acquire a Working Knowledge of the Theory and Practi

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...the solid bodies. Ques. What are the important qualities that a lubricant should possess? Ans. 1, Body; 2, fluidity; 3, freedom from gumming ingredients; 4, freedom from acidity; 5, stability under temperature changes; 6, freedom from foreign matter. Ques. What is understood by the term " body of a lubricant?" Ans. The " body of a lubricant" indicates a certain consistency, or substance, that prevents it being squeezed out easily from between the moving bodies. Ques. What is understood by the term " fluidity of the lubricant?" Ans. The fluidity of a lubricant refers to a certain lack of cohesion between the different particles of the substance, that reduces the fluid friction to a minimum. Ques. Why should lubricants be free from gumming ingredients? Ans. A lubricant that gums loses its fluidity easily, collects dust and grit, and thus increases friction and wear and tear generally. repairs. Ques. Why should lubricants possess stability under temperature changes? Ans. Lubricants should retain their good qualities, even when used under high temperatures, as in steam cylinders or valve chests, or when used under low temperatures, as in ice machines or exposed winches and windlasses. They should not evaporate nor be decomposed by the heat, nor congeal by the cold, and should retain their normal body and fluidity as much as possible. Ques. Why should the lubricant be free from all foreign matter? Ans. Foreign matter will increase the friction, and clog the feeding tubes, thus leading to dangerous accidents. Ques. What determines mainly the choice of a lubricant for a given purpose? Ans. l, Price; 2, pressure; velocity; 3, temperature. Ques. going good lubricants for cylinders'a'n'ci valves. Ans. For...show more

Product details

  • Paperback | 48 pages
  • 189 x 246 x 3mm | 104g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236982932
  • 9781236982933