4. Compare the electromotive forces of two batteries. • Place wall 5. Measure the difference of potential between the terminals of an in-candescent lamp and the current passing through it. 6. Determination of a high resistance. 7. Determination of a low resistance. 8. Test the readings of a voltmeter or amperemeter by Kelvin's balance. 9. Determine Hassuming a knowledge of the moment of inertia of the magnet.io de Baloni .. A1.A well 5 ft. diameter is to be sunk in firm gravel soil. Describe the work with sketches to illustrate your answer. 2. A roof of corrugated iron on timber rafters and battens is to be ventilated throughout the length of the ridge. Show by sketches how you would frame the ventilator. 3. Describe the work of constructing a 4" terraced roof, giving materials required and methods of work. 4. Sketch two courses of brickwork in 18" walling at the corner of a building, showing what yon consider the best method of bonding. 15. Describe and sketch the joints in framing and panelling for a 14" teak panel door.`. ! 6. Note what loads you would assume for calculating the strength of joists or girders in roofs and floors of residential buildings and floors of roadbridges on kutcha roads. 7. Sketch and describe construction of a timber pile pier for timber road bridge 20 ft. spans, 15 ft. roadway. 8. A stone pier has to be built for a bridge. The river bed consists of sand 10 ft. in depth overlying rock of irregular surface. The sand is never free from water. Describe how you would get the founds in 1 ROADS AND RAILWAYS. Examiner-ALEC. J. NEELY, Esq., M.A., M.A.I. (DUBLIN). The figures in the margin indicate full marks. 1. You are given an ordinary Dumpy Level and instructed to run a 25 certain line of levels. Describe the different steps you would take, before starting, to satisfy yourself that the Level is in proper adjustment. (You can assume that the result of each step, as it is completed, is satisfactory). 2. Draw up a specification covering the ingredients, proportions, míx- .30ing, and laying of a good lime concrete suitable for the foundations of a bridge. (The foundation bed is dry and about 15 feet below the ordinary ground level at site). 3. Write a note describing how first-class metalled roads in India are maintained and repaired. 25 4. You are deputed to examine a first-class metalled hill road, built 30 on a stiff side-long slope, with a view to its being taken over from the Contractors. Draw up a skeleton report remarking on the design and workmanship. 5. What purposes are served by (a) Metalling on a road; b) Ballast 25 on a railway. 6. A railway line runs through ordinary country on a bank 5 ft. high. 30 Sketch a suitable cross-section and fully dimension it, shewing pit land, bank, ballast, sleepers and rails. Give reasons for the figures you adopt. 7. What considerations determine the " gauge " of railways? 25 8. The spread of a railway crossing is spoken of as 1 in 12, 1 in 8, 40 etc., or again the crossing is spoken of a No. 12, a No. 8, etc. What is meant by these numbers ? If r is the radius of the centre line of a main line of railway, and if r2 is the radius of the centre line of a branch taking off the inside of the main line curve, N the number of the necessary crossing, and 2g the gauge of each track, prove the relation. rir2=4g N2(ri-r2-g) 9. Discuss at some length the subject of "creep" of rails. Describe in 40 some detail any one method adopted by Engineers to stop" creep. 10. By means of a dimensioned sketch plan and section show the arrangement of tracks, and position of signals of any 3rd class station (Single Line) with which you are acquainted. What information do these signals in the different positions of the arms convey to drivers of trains? 30 HYDRAULIC ENGINEERING. Examiner-C. ADDAMS WILLIAMS, ESQ. The figures in the margin indicate full marks. 1. Explain the meaning of " velocity of approach." Show what modification has to be made in the equation of discharge for a completelysubmerged sluice, to allow for the effect of velocity of approach, in terms of the area of the approach-channel. 2. Explain in detail the method of ascertaining the discharge of a canal or river by means of velocity rods. 3. You are ordered to report on a proposed scheme for draining a low-lying tract of country into a non-tidal river. State what points you would enquire into, and what observations you would make. 4. It is required to pump a supply of 1,000 gallons a minute from a river into a reservoir, the surface of the water in which is 30 feet above the surface of the river, its distance from the river being 2,000 feet. An engine is available, capable of yielding a useful effort of 20 effective H.P. (after allowing for all resistances in the pump). What 50 70 70 is the smallest size of pipe that will deliver the requisite supply? The formula of pipe-discharge to be used is Q-α where Q-discharge (in gallons per minute); h = loss of head in friction in the pipe (in feet); L-length of pipe (in feet); C-a coefficient, whose value for pipes of different sizes is given 50 C= 1,205 1,928 2,864 4,032 5,446 7,122 9,075 11,323 5. Explain briefly, with sketches, the method of sand-filtration as generally adopted in waterworks in Bengal. APPLIED MECHANICS. Examiner E. R. GARDINER, ESQ. 1. What is meant by the modulus or coefficient of elasticity and how do you determine it experimentally? 2. Determine the general expression for the Bending Moment at any section on a cantilever uniformly loaded. 3. A timber beam 12′′ × 6′′ has a clear span of 15 ft. and is loaded by two loads of 1 ton, andton, placed 6 ft. and 10 ft. from one end of the span. Determine the maximum intensity of longitudinal stress in the beam. 4. Design a suitable section for a plate girder of mild steel, having a clear span of 30 ft. and loaded with 15 cwt. per foot run, stresses not to exceed 6 tons per s.i. compression and 7.5 tons per s.i. tension. 5. Sketch diagrams for bending moments and shearing forces for beams supported at both ends in the following cases :— (a) uniform load; (b) load at centre; (c) three unequal loads irregularly spaced. 6. Discuss the reasons for the greater difficulty in arriving at suitable section for long struts than for long ties. 7. Determine by means of stress diagrams, the stresses in the members of the truss sketched. Trusses spaced 10 ft. apart; weight of roof, 15 lbs. per sq. ft.; wind pressure, 30 lbs. normal. 10-0 K -10--0 10 - 0 8. Assume any section for a retaining wall holding an earth bank, and show how you would examine its stability both as regards overturning and sliding on its base. MECHANISM AND STEAM ENGINE. Examiner -F. WALFORD, Esq., A.R.C.S., A.M.INST. M.E. The figures in the margin indicate full marks. 1.The sketch shows a common flange coupling. If the shaft is to transmit power up to, say 50 H. P., what should be the number and size (d) of the bolts and the radius (R) of the bolt circle ? What is the use of the projection on the flanges marked A. 40 2. Show by construction how you would determine the correct form 40 for the teeth of a spur wheel 4 feet diameter. The diameter of the smallest wheel in the train being 8 inches, what sized rolling circle would you use? 3. Pulleys for belt driving are usually made of larger diameter in the centre than at the edges. Why is this? Give reasons for your answer. How do you calculate the horse power given by a belt to a pulley ? 30 30 4. A boiler of 7 feet diameter is inch thick. What safe working 40 pressure will it stand if the safe tensile stress of the material is 5 tons per square inch ? Assume that the longitudinal seams have a strength of 60 per cent only of the plate itself. What must be the thickness of the cylindrical flue of this boiler, if 40 its diameter is 2 ft. 9 in., and if the welded joint in it is assumed to stand safely a crushing force of 2 tons per square inch. 5. How is the distribution of steam in the cylinder of a steam-engine 40 having a simple slide valve affected by altering (a) the advance, (b) the lap, (c) the half-travel, other conditions remaining the same? probable indicator diagram in each case. Draw the 6. The piston of an indicator is inch diameter, the spring compresses inch with a force of 8 lbs., the tracing point has a motion which is four times that of the indicator piston, the mean ordinate of the indicator diagram measures 2 inches, the diameter of the engine cylinder is 20 inches, and the speed of the piston is 400 feet per minute. What is the horse power of the engine? 40 7. Give a short description of the vacuum automatic brake as applied 40 to railway rolling stock. Illustrate your answer with sketches. 8. What are dry-saturated, superheated, and wet steam, respectively? 30 Why is there a loss of efficiency in using wet steam? Define a thermal unit and explain the method of measuring the latent heat of steam. ENGINEERING AND ARCHITECTURAL DRAWING. Examiner-B. G. GWYTHER, ESQ. 1. Three spheres of 1", 2" and 3" diameter respectively, rest on a 35 horizontal plane, touching one another. Draw a full size plan, showing by dotted lines the parts invisible from above and showing also their points of contact. 2. A cone ABC lies on a horizontal plane, its base BC is 4" in di- 45 ameter and the height AD is 6". Another horizontal plane XY 13′′ above the original plane AB cuts the cone. Draw a plan of the parabolic section, showing clearly by projection your method of obtaining it. X B 3. Draw to scale (1" to the foot) the accompanying elevation of a doorway. (Full marks may be obtained for drawing a half elevation.) |