Mechanical Engineering Answers

A submarine is cruising at a depth of 280 m in seawater with a specific gravity of 1.03. If the inside of the submarine is

pressurized to standard atmospheric, determine the pressure difference across the hull in (a) kPa, (b) bars. The average local gravity is 9.70m/s2.

A pilot notices that the barometer pressure outside his aircraft is 800 mbars. The airport below the plane reports a barometric pressure of 1020 mbar. If the air density averages

1.15 kg/m3 and the local gravity is 9.70 m/s2, determine the height of the aircraft above the ground, in meters.

. a vertical rectangular gate, 6 m high and 4m wide , has water on one side to a

depth of 3 m and a liquid of specific gravity 0.85 to a depth of 2m on other side

.what is pressure on water side & what is pressure on other liquid side of sp. gr.

0.85

1. 10 m3 of mercury weights 136×104 N. calculate its specific weight, mass

density, specific gravity.

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.