Calendar: 1891-1892 Page 835

engineering department cxlvii VII -iffterf flmcal fngmcm'ng SECOND AND THIRD YEARS Compare the strength of cast-iron beams of the follow- ing dimensions 1st 3" square loaded on its side 2nd 3" square loaded across diagonals 3rd Rectangular 5" broad 2" deep 4th 2" diameter Which is the most economical form of the above beams Shew how you arrive at your result If each of the above beams had span of feet and was loaded 1st feet from one support 2nd With load uniformly distributed along its length Determine the breaking load in each case allowing 16 tons as the breaking stress in the outermost fibre If the beams were wrought iron what load would in each case buckle the beams Given 1st steel bar 10 feet long and 4" in cross section 2nd cast-iron column hollow 6" outside and inside diameter and feet long What load would destroy each and what load would pro- duce an extension or compression of J" inch Given non-condensing engine whose boiler pressure is 150 lbs per square inch temp of feed 60 50 revs 60 per minute steam used 18 lbs per per hour How many thermal units per stroke are given to the engine Give the values of and total If the engine exhausts into the atmosphere what is its maximum theoretical efficiency and how many thermal units per minute are turned into work If the coal used in the above engine has calorific value of 14 000 thermal units and the boiler efficiency is 6- How many lbs of coal will be used per per hour What will be the actual efficiency of the engine apart from the boiler