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compressed air vessel has an inside diameter of 2 m and a plate thickness of
12,5 mm. If the tensile stress induced in the plating is to be limited to 100
MPa, calculate for both the longitudinal and circumferential seams the pressure
necessary to induce this stress. Take the longitudinal and circumferential
joint efficiencies as 80 % and 50 % respectively. What would the actual
allowable pressure be?
A fan at STP is at .87 “ WC delivers 20,800 cfm at 1700 RPM and draws 3.9 BHP. The fan is moved to an altitude of 9500 feet ASL. Find the CFM delivered at the same RPM. What is the SP and HP at the new altitude? What was the number of lbs/ hr delivered at SL versus at altitude? How much must the fan be sped up to deliver the same mass flow? What is the new SP and BHP at the increased speed?
in reciprocating compressor with crank slider mechanism the obliquity ratio is 3.75 with crank radius of 0.2m the crank rotating at 20 rad/s what is the acceleration of the piston when the velocity is zero
A cafeteria can seat a maximum of 50 persons. Customers arrive in a Poisson stream at the rate of 10
per hour and are served (one at a time) at the rate of 12 per hour.
(a) What is the probability that an arriving customer will not eat in the cafeteria because it is full?
(b) Suppose that 3 customers (with random arrival times) would like to be seated together. What is
the probability that their wish can be fulfilled? (Assume that arrangements can be made to seat
them together as long as 3 seats are available).
calculate the quantity of air supplied per kg of fuel burnt in the combustion chamber of the boiler when the required draught of 1.85 cm of water is produced by a chimney of 32 m height. The temperature of the flue gases and ambient air recorder are 370°C and 30°C respectively.
State the assumptions made in deriving a bending formula.
1, Oil with a viscosity coefficient of 15 poise is filled between parallel plates spaced 5 mm apart. When the lower plate is fixed and the upper plate moves at a speed of 5 m/s. what is the shear stress (Pa) generated on the plate surface?
2, When 1200N of lead is suspended from the bottom of cube (wood) of 1 m on a side and placed in water, how many cm is the height of the piece of wood that rises above the water ? (the specific gravity of wood block is 0.4, the specific gravity of lead is 12, and the bottom of the wood block is kept horizontal.
Draw neat iron – iron carbide equilibrium diagram and indicate phases clearly.
a) Explain various invariant reactions with help of microstructures.
b) Consider a hypo eutectoid steel (C0 = 0.012 + 0.78 [X/106]) and hyper eutectoid steel ((C0 = 0.78 + 0.012 [X/106]) compositions and estimate pro-eutectoid phase fractions, for the given compositions.
c)Also estimate compositions of ferrite, Fe3C and phase fractions just below eutectoid temperature.
Note: Also calculate your compositions from the given equation (X is your sl. number) and indicate it. For each subsections (a,b,c) please draw a separate Fe-Fe3C diagram.
The crankpin of an engine sustains a maximum load of 35 kN due to steam pressure. If the allowable
bearing pressure is 7 N/mm2
, find the dimensions of the pin. Assume the length of the pin equal to 1.2
times the diameter of the pin.
The crankpin of an engine sustains a maximum load of 35 kN due to steam pressure. If the allowable
bearing pressure is 7 N/mm2
, find the dimensions of the pin. Assume the length of the pin equal to 1.2
times the diameter of the pin.
