lation for the manufacture of nitric acid in this case, the waste acids being given free of cost. Nitre costs $2.50 per cwt., and sulphuric acid of 98%, $1.10 per cwt. Note. The absorption tower and chimney of the nitric acid plant are available for connecting up. Sp. gr. 98% sulphuric acid=1.84. Sp. gr. 20% fuming sulphuric acid=1.95. Sp. gr. trinitrotoluol=1.28. 2. Draw a plan approximately to scale, showing the layout of all the apparatus designed. The nitric acid plant, etc., need not be shown. FACULTY OF PRACTICAL SCIENCE. GENERAL ENGINEERING I. 1. Concrete is mixed in the proportion of 1:21:6. The voids in sand are 40%, in stone 45%. A barrel of cement contains 3.8 cu. ft. How many yards of concrete can be made from 100 barrels cement? 2. Draw a stress diagram of a fink roof truss of 60 ft. span and 20 ft. rise, 8 panels, unit loading on panel points of upper chord, and compute the stresses in U2 L, and U2 L2. 3. A beam 20 ft. long rests on two supports, 5 ft. from either end. It carries a load of 2 tons at one end, 5 tons at the centre, and 4 tons at the other end; also a uniformly distributed load of 500 lbs. per foot over its whole length. Find reactions, and draw S.F. and B.M. diagrams, marking the points of max. B.M. and points of inflection. 4. Show how to find the maximum deflection of a simple beam, loaded uniformly. 5. A floor joist of yellow pine is 3 in. wide, 16 in. deep, and 16 ft. long between supports. Find the uniformly distributed load which it will carry, with a fibre stress not to exceed 1200 lbs. per sq. in., and find the deflection at the centre under this load. 6. A cantilever beam of uniform strength is 8 ft. long and 3 in. wide. It carries a load of 1000 lbs. at the end. What should the profile of the beam be, and what should be the depth at the fixed end? S=1200. 7. Make a list of the average values of the elastic limit, ultimate strength, and coefficient of elasticity of steel, cast iron, and timber. 8. Find the moment of inertia of a tee section with a 2" x 6" stem and a 2′′ x 6′′ flange, about an axis through the centre of gravity perpendicular to the stem. FACULTY OF PRACTICAL SCIENCE. GENERAL ENGINEERING II. 1. A Howe roof truss of 8 panels has a span of 60 ft. and a rise of 15 ft. All the panel points of the upper chord are loaded with unit loads. Find the stresses in L, L,, U2 L3, U, L, and U, U4. 3 3 2. An 8 panel Pratt bridge truss has a span of 120 ft. and a height of 20 ft. Find the maximum stresses in the members UL, U2 L3, L2 L, and U, U,, due to unit loads at the panel points of the lower chord. 2 3. Compression tests are made on two oak columns 1 in. square with fixed ends. The length of one is 15.81 in., of the other 22.36 in. The shorter column fractures under 3000 lbs., the longer under 2000 lbs. Determine S and 4 in Rankine's formula. 4. A steel shaft 10" in diameter transmits 1000 H.P. At what speed must it run so that the maximum shearing stress shall not be greater than 10,000 lbs. per sq. in.? 5. Find the section modulus (I/c) of a continuous steel beam required for the following conditions: Two spans of 20 ft. each, one span unloaded, the other loaded uniformly with 500 lbs. per foot. 6. Discuss the stability of a masonry dam of trapezoidal section 20 ft. high, 4 ft. wide on top, 15 ft. wide on the base, masonry weighing 150 lbs. per cu. ft., upstream face vertical, coefficient of sliding friction 0.5. and find the resilience of a 12 in. steel I-beam 20 ft. long between two supports, loaded uniformly, the elastic limit being 30,000 lbs. per sq. in. F 30,000,000, and I=321. 8. State the principles underlying the design of reinforced concrete beams. |