In slowly cooled hypoeutectoid steels one normally finds a microstructure in which the pearlite colonies are surrounded by ferrite grains. Explain.

Problem 7.56

A three-point bending test was performed on an aluminum oxide specimen having a circular cross section of radius 4.7 mm; the specimen fractured at a load of 3740 N when the distance between support points was 44 mm. Another test is to be performed on a specimen of this same material, but one that has a square cross section of 11 mm in length on each edge. At what load would you expect this specimen to fracture if the support point separation is maintained at 44 mm?

Article on leadership and related to mechanical engineering.

The rate of emission of SO₂ from the stack of a power plant is 150 gm/sec. The stack height is 50 m. Calculate the effective plume height on a sunny September day when the wind velocity is 5 m/sec. Use Class B stability. The effluents are being released at 10m/s and at a temperature of 310^oK. The atmospheric temperature is 293^oK. The stack diameter is 0.5 m

I need to Elaborate a thermodynamic analysis of energy and efficiency of traditional and Perovskite solar cells. Can I get Help with this?

Calculate the maximum mass flow possible through a frictionless, heat-insulated, convergent nozzle if the entry or stagnation conditions are 5 bar and 15°C and the throat area is 6.5 cm2. Also calculate the temperature of the air at the throat. Take cp = 1.00 kJ kg−1 K−1 and γ = 1.4.

Air at 5 bar and 560K is expanded in steady flow in a horizontal convergent–divergent duct to an exit velocity
of 640 ms−1. The walls of the duct are heated so as to keep the temperature drop to one-half the value of an
isentropic expansion to the same velocity and pressure from the same initial conditions. Calculate, assuming
negligible initial velocity:
a. the heat supplied;
b. the final temperature;
c. the mass flow rate per square metre of exit area.

Which type of motor is hydraulically balanced so as not to have buckling forces on the drive shaft.
(A) Gear
(B) Palettes
(C) Pistons

And Why?

The pressure compensator in which type of hydraulic piston motor is used.
(A) Axial
(B) Inclined axis
(C) Alternative

And Why?

The pressure plate is used in the manufacture of the motor of:
(A) Gear
(B) Palettes
(C) Pistons

And Why?

Thank you for your time, have a nice day :)

Which type of motor is hydraulically balanced so as not to have buckling forces on the drive shaft.
(A) Gear
(B) Palettes
(C) Pistons

And Why?

The pressure compensator in which type of hydraulic piston motor is used.
(A) Axial
(B) Inclined axis
(C) Alternative

And Why?

The pressure plate is used in the manufacture of the motor of:
(A) Gear
(B) Palettes
(C) Pistons

And Why?

Thank you for your time, have a nice day :)

The composite walls of a building are made up of three materials. The inside layer of the walls is 1-cm thick wall board (kwb = 0.2 W/mK). The middle layer is 10 cm thick insulation (kI = 0.06 W/mK) and the outside layer is 3 cm of wood (kw = 0.15 W/mK). The total wall area is 350 m2. The outside air temperature is -10 oC and the inside air temperature is maintained at 20 oC. The inside and outside average convective heat transfer coefficients are 7 and 35 W/m2K, respectively. You are asked to: a. Sketch and label the thermal circuit diagram for the rate of heat transfer, q, from the inside of the room, through the composite walls and to the outside. Evaluate all individual thermal resistances, the total thermal resistance and the overall heat transfer coefficient. [10] b. Evaluate q. [2] c. Determine the unknown temperatures on both sides of the insulation layer. [3] Hint: Neglect radiation, contact resistance and conduction in air. The walls are large enough so that 1-dimensional conditions exist.

There are proposals to store energy in flywheels for load leveling in utility systems.
During the off-peak period for energy demand at night, these flywheels are charged
to high speeds. At peak periods during the day, this energy is supplied back to the
utility.
How would ASDs play a role in this scheme? And what is the role of electric drives in electric transportation systems of various types?

Draw a diagram of a typical BDP flame above an AP/HTPB composite propellant. Label each flame, and include the position of the AP and HTPB in the condensed phase.

For the given set of strand burner data (given also as a .txt for easy excel import):

Calculate the parameters, a and n, of St. Robert’s Law for each T0. Plot the results in log-log space.

Calculate the temperature sensitivity of the propellant, σ_p at P=0.5 MPa, P=5 MPa, and P=10 MPa.

A 35-kg box of beef at 6 C having a water content of 60% is to be frozen to a temperature of -20 C in 3 h. Determine:

a) the total amount of heat that must be removed from the beef

b) the average rate of heat removal from the beef