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A copper tube having a cross-sectional area of 2 000 mm2 and a length of 300 mm is placed between two rigid caps. Four 22-mm-diameter steel bolts are symmetrically arranged parallel to the axis of the tube and are lightly fastened. Find the stress in the tube if the temperature of the assembly is raised by 70 °C. What load will each bolt carry at the raised temperature? (Let EST = 200 GPa; Ec u = 100 GPa; aST = 12 x 10"6 / o C; ac u = 16 x 10-6 /°C.)
When the cold junction of a thermocouple thermometer is at 5 C and the hot junction at 110 C, the millivoltmeter shows a deflection of 3.5 mV towards the left. The hot junction is now put in an unknown temperature while maintaining the cold junction at 5 C. The millivoltmeter now shows a deflection of 4.7 mV towards the left. Calculate the unknown temperature.
Consider a 55 wt% Sn–45 wt% Pb alloy at 160˚C,
a. Cite the phases present
b. Calculate the relative amount of each phase present in terms
of (a) mass fraction and (b) volume fraction.
Note: Locate the required points clearly on Lead-Tin phase diagram. Take
necessary values wherever required and mention the reference against
every value you take, e.g. any online source/book or research paper
Replace the three forces acting on the guy wires by a single, equivalent force acting on the flagpole. Use T1 = 200 lb, T2 = 400 lb, and T3 = 350 lb.
15. If a contractor proposes to increase concrete cover beyond contractual
specification (i.e. 40mm to 70mm), shall engineers accept the proposal?
12. In erection of falsework, for a rectangular panel inside a falsework should it be braced along the two diagonals?
11. What is the indication of shear slump and collapse slump in slump tests?
16. Can grout replace concrete in normal structure?
9. Comparing the rate of “Formwork exceeding 300mm wide, horizontal or at any inclination up to and including 5o to the horizontal” with the rate of “Formwork exceeding 300mm wide, at any inclination more than 85o up to and including 90o to the horizontal”, which one is higher?
5. In concrete compression test, normally 150mmx150mmx150mm concrete cube samples is used for testing. Why isn’t 100mmx100mmx100mm concrete cube samples used in the test instead of 150mmx150mmx150mm concrete cube samples?
