Explain and give your opinion on solidification process from nucleation until solidified metal.

In: Mechanical Engineering

A 10.8 kg of nickel initially at 202 ∘C is dropped into an insulated basin containing 23.6 kg of water initially at 27.8 ∘C. Assume that he water does not undergo any phase change when the hot metal was initially dropped into the water.

a) Assuming no heat losses from the container, what is the final equilibrium temperature between the water and the nickel? ∘C

b) What would the equilibrium temperature be if the nickel had lost 479 kJ of heat before being dropped in the water? ∘C

In: Mechanical Engineering

Explain the difference between the terms peak and residual shear strength in relation to loose sands and dense sands.

In: Mechanical Engineering

Understand the impact of professional engineering solutions in societal and environmental context and demonstrate knowledge of and need for sustainable development

In: Mechanical Engineering

Identify basics and opportunities in entrepreneurship related to engineering

In: Mechanical Engineering

Please type the working principles and application areas of a venturi tube in a few paragraphs (5 or 6) with examples. If there are any direct quotes from a resource, please use quotation marks. Thanks!

In: Mechanical Engineering

Solve Q1 and Q2 by matlab :

Q1: Based on what you learned about thermophysical

properties library, calculate the density of seawater at 25°C

and Pressure 1 MPa where the salinity is changed from 25,000

ppm to 55,000 ppm ?

02: Based on what you learned about thermophysical

properties library, calculate the density of seawater at

Pressure 1 MPa and has salinity of 42,000 ppm where the

temperature is changed from 25°C to 65°C ? If it changed why?

In: Mechanical Engineering

A 15kW electric motor, which is running at 43 rev/s, is used to drive a crusher which operates 24 hours per day. An engineer has specified 212 mm and 315 mm pitch diameters for small pulley and large pulley respectively; and C 3454 V-belt type.

a) What should be the conservative service factor for this belt and pulley system?

b) Calculate the center distance between the pulleys?

c) Calculate allowable power, design power and required number of belts. (Take design factor nd as 1.)

d) Calculate centrifugal tension, forces at tension side and loose side, initial tension and factor of safety. (Take friction coefficient including wedge effect as 0.5123.)

In: Mechanical Engineering

Assuming we are deciding to manufacture socks that are made by cotton surrounded by nylon

Define a predictive maintenance plan for the components of your plant.

a. Describe the components that will be under the plan (what tools, machines, robots, etc)

b. Choose two of those components and define a detailed plan of activities for their predictive maintenance

In: Mechanical Engineering

1. Suppose there a joint where the bolts have a stiffness of 1638 kips/in per bolt and the members have a stiffness of 10930 kips/in per bolt. The bolts are ½-13 UNC, SAE 8 grade, installed for non-permanent installation. The maximum load is 14 kips per bolt. For the fatigue calculation, consider that the minimum load is zero.

a) What is the stiffness constant, C, of the joint?

b) What is the proof load, SpAt, of the bolt, in kips?

c) What is the pre-load, Fi, on the bolt, in kips?

d) What is the factor of safety in yield, np?

e) What is the load factor of safety, nL?

f) What is the joint separation factor of safety, nO?

g) What is the midrange stress, sm, in kpsi?

h) What is the amplitude stress, sa, in kpsi?

i) What is the initial stress, si, in kpsi?

j) What is the fatigue factor of safety, nf?

k) Is this joint safe in both static and fatigue loading?

2. If the ½-13 UNC, SAE 8 grade bolts from the previous problem are zinc-plated and eight of them are used on a 6 in. bolt circle,

a) What is the minimum number of these bolts that should be applied to this bolt circle?

b) What is the maximum number of these bolts that should be applied to this bolt circle?

c) Are eight bolts an appropriate number here?

d) What is the torque required to make up the bolts to the required pre-load, in in-kips?

e) What torque would be required to make up the bolts for permanent installation, in in-kips?

In: Mechanical Engineering

A four-stroke engine is running on methane with an equivalence ratio of 0.8. The air and fuel enter the engine at 250 C, the exhaust is at 5270 C, the heat rejected to the coolant is 340 MJ/kmol of fuel.(a)Write the equations for stoichiometric and actual combustion.(b)By calculating the enthalpy of the exhaust flow, deduce the specific work output of the engine, and thus the overall efficiency. (c)If the engine has a swept volume of 5 Litres, and volumetric efficiency of 72%, calculate the power output at engine speed of 1500 rpm. The ambient pressure is 1 bar.State clearly any assumption that you make, and comment on any problem that would occur with a rich mixture.

In: Mechanical Engineering

Describe the design criteria for the next combustor sections.

1.-Diffuser

2.-Primary zone

3.-Intermediate Zone

4.-Dilution Zone

5.-Swirler

6.-Primary zone holes

7.-Cooling slot

In: Mechanical Engineering

1.-Define the combustor loading parameter.

Why is the exponential factor different to ideal scenario?

In: Mechanical Engineering

**A shock wave in air exists in a de Laval nozzle where
the cross-sectional area is 130
cm**^{2}*.*The inlet
Mach number, area and static pressure are 0.35, 210
cm^{2}**and 350 kPa. The
exit area of the nozzle is 135
cm**^{2}*.*
Find:

**The back pressure for this shock wave to occur**

In: Mechanical Engineering

explain the consideration in the design of the dimensions of formed and the parallel key having rectangular cross- section

In: Mechanical Engineering