Question 2:
“The RMS Titanic was an Olympic-class passenger liner, launched for
the
first time in 31 May 1911. The ship’s steel was “probably the best
plain
carbon ship plate of the time”. Nevertheless, shortly before
midnight on 14
April 1912, four days into the ship’s maiden voyage, Titanic hit an
iceberg.
The impact caused the hull to fracture and water poured into the
ship, sinking
it two hours and forty minutes later. Of the 2223 people on board,
only 706
survived. Most of the victims died of hypothermia in the icy -2°C
Atlantic
waters between Southhampton and New York, the destination, where
the
ship sank. There are many factors that contributed to the sinking
of the ship;
one of the primary reasons being metallurgy of the ship’s
hull.”
Explain why even if engineers had tested the steel hull’s material
properties
at room temperature, they still would not have predicted failure
when taking
the impact of the iceberg in the icy Atlantic waters into account.
Also,
describe how the steel should have been tested.
In: Mechanical Engineering
In Case of Gas power plant, Clearly Identify the at least 12 Important parts. Explain the kind of fuel is used to run the gas power plant. Compare between the Gas power plant and Diesel power plant
In: Mechanical Engineering
Discuss how the fatigue resistance of a part or material can be improved.
Its for 5 marks so please no short answers.
In: Mechanical Engineering
Consider an automobile engine which operates on the ideal Otto cycle. In this engine, air is compressed with a compression ratio of 10. At the beginning of the compression process, air is at 105 kPa and 17oC, and in the combustion process 640 kJ/kg of heat is added to air. Taking into account the variation of specific heats with temperature, determine (a) the pressure and temperature at the end of the heat-addition (combustion) process, (b) the net work output, (c) the thermal efficiency of the engine, and show the cycle on a P-ν diagram.
In: Mechanical Engineering
Consider a diffuser in which air flows steadily. At the inlet of the diffuser the pressure, the temperature and the velocity of the air are 100 kPa, 110oC and 175 m/s, respectively. At the exit of the diffuser the pressure, the velocity of the gas and the area of the diffuser are 110 kPa, 15 m/s and 0.1 m2 , respectively. Accounting for an heat loss of 3 kJ/kg from the diffuser to the surroundings at 100 kPa and 25oC and assuming constant specific heats, determine (a) the exit temperature, (b) the rate of exergy change and (c) the second-law efficiency of the diffuser where ηII, diffuser = exergy output exergy input .
In: Mechanical Engineering
make a scheme or illustration of the precipitation hardening process for aluminum alloys and explain each step
In: Mechanical Engineering
Vibrations Question in Mechanical Engineering:
Vibrating System
Stability Question
Describe in as much detail as possible what is meant by a stable vibrating system and state the condition which must be satisfied to achieve stability.
In: Mechanical Engineering
Problem 1. Explain the definition of the unit of quantity, the definition of SI, and the basic unit of SI. Also, select one of the SI basic units and explain the definition of the unit in detail. However, write it down so that high school students can understand it. Summarize the above in A4.
In: Mechanical Engineering
Design a robot that can support humanity from the spread of COVID-19 . Draw suitable diagrams and focus your explanation towards the robot subsystems.
In: Mechanical Engineering
What could be some of the reasons for the discrepancies between the Hilpert’s equation or the Churchill & Bernstein’s equation.
In: Mechanical Engineering
Research question: How is ceiling welding possible? (It welds in the overhead (overhead) position, how can the droplets that dissolve from the electrode tip not be lowered downward by gravity but transferred to the welding bath upward?)
In: Mechanical Engineering
In: Mechanical Engineering
Superheated vapor enters the turbine at 10 MPa, 480°C, and the condenser pressure is 7.5 kPa of a steam Rankine power cycle. Isentropic efficiencies of the turbine and pump are 84% and 73%, respectively. Determine for the cycle
a. Sketch the cycle of a T-s diagram. Indicate the isobars with their values and the values for temperature and entropy.
b. The heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam flowing.
c. The thermal efficiency.
d. Compute the entropy generated by the turbine per unit of mas of steam flowing.
e. The heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam flowing. [Hint: this refers to the cooling tower]
In: Mechanical Engineering
Manufacture methods course:
working process which will increase strength of metals? Draw the process.
explain mechanical mechanisms.
objective in real life.
In: Mechanical Engineering
1 kg of saturated steam at 1000 kPa is in a piston-cylinder and the massless cylinder is held in place by pins. The pins are removed and the system suddenly and adiabatically expands to 5x its original volume before the piston hits a pair of upper pins. The expansion takes place against an atmosphere is 60 kPa. What is the final specific internal energy of the system? The answer will be in kJ/kg.
In: Mechanical Engineering