CIVIL ENGINEERING.-PART II.

FIRST PAPER.

The Board of Examiners.

1. Supply detailed sketches and descriptions of inexpensive culverts and pitched crossings to carry

small streams across roads in timbered and rocky country respectively.

2. Describe any methods you know for constructing roads and streets over loose sand.

3. Write a short essay upon footpaths of streets in small towns and large cities.

4. Describe fully the methods of scavenging, cleaning, and disinfecting employed by the Melbourne City Council.

5. An electric tramway is five miles long, three miles being nearly level, and the remaining two being a steep ascent with sharp curves. Locate the power house, and give as many details as you can of the system you would advocate.

6. Make a detailed sketch of the gripper used on the Melbourne cable tramways.

CIVIL ENGINEERING.-PART II.

SECOND PAPer.

The Board of Examiners.

1. Write an essay on continuous automatic railway brakes, and illustrate it by detailed sketches of those portions of the Westinghouse brake mechanism to be found upon ordinary passenger carriages.

2. Discuss fully the disturbing forces acting upon a four-coupled inside cylinder locomotive, distinguishing between those due to the direct action of the steam and those due to the inertia and centrifugal action of the moving parts. Explain carefully how you would proceed to determine the magnitude and position of balance weights needed to minimize the effects of these disturbing forces both on the engine and on the road.

3. Make a diagram of a double-line junction, with a complete system of interlocking points and signals, and explain the action and use of each part.

4. Write an essay on the construction of light-houses, on isolated rocks and sandbanks distant from land.

5. Give a full description, illustrated by detailed sketches, of Clark's Patent Hydraulic Lift Graving Dock, and discuss its merits as compared with ordinary Graving Docks.

K

MECHANICAL ENGINEERING.

FIRST PAPER.

The Board of Examiners.

N.B.-Not more than SIX questions to be answered. All questions are of equal marking value.

1. In the accompanying indicator diagrams some of the defects are due to unskilful manipulation. Shew clearly how these arose, and also state how you would alter the engines to remove defects which are clearly shewn in two of them.

2. Take diagram No. 2, and assume that the weight of reciprocating parts is equal to 3 lbs. per square inch of piston, and that the average piston speed is 6 feet per second, calculate the shocks due to inertia at the end of each stroke.

3. Calculate the leading dimensions of a dredgepump, capacity 5,000 cube yards of liquid per hour, against a total hydraulic pressure of 15 lbs. per square inch.

4. Assuming the liquid in the last-mentioned pump to weigh 65 lbs. per cubic foot, calculate the probable I.H.P. of the engines. Shew how you would connect the engines with the pump, and draw in detail the bearings of pump-shaft, giving maximum pressure of 120 lbs. per square inch, and estimate the H.P. lost in friction in these bearings.

5. Give general sizes and capacity of a water tube boiler to raise 3,000 lbs. of steam to 180 lbs. gauge-pressure per hour. Calculate the dimensions, and shew the mode of connecting the tubes you would recommend.

6. Calculate the dimensions of the flue from the above boiler, and give a sketch of a suitable economizer, shewing where it should be placed, on the assumption that flue gases have a temperature of 530° Fahr.

7. (a) Define "duty" and "efficiency" of a steamengine.

(b) What saving in "duty" would you expect from using petroleum vapour instead of steam? Support your statement by the necessary figures. (c) In calculating "duty," how would you treat the work done in the condenser and feed-pumps?

8. Give the complete cycle of operations which would take place in a petroleum engine, and shew section through mixer, and also through valve and cylinder chest.

9. Sketch a suitable valve gear for the H.P. cylinder of a marine-engine, and trace a curve shewing the valve motion when the engines are working full speed ahead.

10. Give a transverse and longitudinal section through a piston-valve and steam-chest, and explain why it is so much used with marine H.P. cylinders.

MECHANICAL ENGINEERING.

SECOND PAPER.

The Board of Examiners.

N.B.-Maximum value of this paper is 100 marks, so questions should be chosen to give only this value in the aggregate, since little credit will be given for incomplete solutions.

1. Calculate the capacities and sizes of the air and circulating pumps required for a surface condenser of a triple-expansion engine of 3,500 I.H.P.-[20 marks.]

2. Discuss the relative advantages of different modes of packing pump-plungers, and sketch some arrangement of packing a double-acting plunger that you would recommend for use in gritty water for mine work.-[20 marks.]

3. Sketch some arrangement of balancing the "dead weight" in mine pumps.-[10 marks.]

4. Shew by geometric construction, or otherwise. that Dr. Proell's governor is pseudo-astatic. [20 marks.]

5. Calculate the weight of fly-wheel, and also diameter, required by a single-cylinder engine of the following dimensions :-Diameter, 9 inches; stroke, 15 inches; number of revolutions, 90 per minute; boiler pressure, 60 lbs. by gauge, cut off at half-stroke; to drive a centrifugal pump. -[30 marks.]