1.Why is the hole missing ?
•Operator error.

2.Why did the operator make the error ?
•He wasn’t inspecting the parts as required.

3.Why wasn’t he inspecting the parts ?
•The supervisor told him we are behind in the shipping schedule.

4.Why are we behind in the shipping schedule ?
•The raw material was late in arriving.

5.Why was the raw material late in arriving ?•The supplier underestimated the lead time.

I want to ask him different answers in the same way

Please ?

A steel drill rod that is 10 mm in diameter and 20 cm long is being heat treated in an oil bath. The 1050°C rod is quenched and held at 700°C and then quenched a second time to 30°C. Calculate the quantities of heat that must be removed at the two quenching stages. Weight density of steel as ρw = 76 kN/m3 , The specific heat of steel is c= 0.50 kJ/(kg . ºC).

Combustion gases with an average specific heat ratio of k=1.33 and a gas constant of R=0.280 kJ/kgK enter a 10-cm-diameter adiabatic duct with inlet conditions of Ma1=2,21 T1=521 K, and P1 =182,1 kPa. If a normal shock occurs at a location 2021 mm from the inlet, determine the velocity, temperature, and pressure at the duct exit. Take the average friction factor of the duct to be 0.01021. Calculate the static stagnation pressure, temperature and density values of the flow at the duct outlet.

Solve the problem by making the necessary assumptions and drawing the schematic figure.

A mass of 0.07 kg of air at a temperature of 30°C and pressure 100 kPa is compressed to a pressure of 600 kPa, according to the law:

(i.e. Polytropic process, n=1.3). Determine:

i.The final volume

ii.The final temperature

iii.The work transfer

iv.The change in internal energy

v.The heat transfer

FLUID MECHANICS

An aircraft flying at an altitude of 5 km with a Mach number of 0.15.

Calculate the velocity of the aircraft? (+1 point)

Calculate the pitot tube measurement reading at the nose using Bernoulli (+1 point) and Isentropic equations (+1 point) separately. Compare them!!!

Calculate pressure coefficient (Cp) at the nose(stagnation) point. (+0.5 point)

Calculate the pressure coefficient (Cp) at the point where Mach number reaches 0.25 (+1 point)

A cast iron saucepan of mass 4.4 kg is filled with 20 L of water at 25 °C, placed on an electric hotplate, and initially brought up to boiling point. Further heat is applied until half of the water has boiled off. What is the cost of the energy used if electricity costs 30 cents per kWh and the hotplate has an efficiency of 75%?

In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370 T (K). The cycle has compression ratio of 10. In the constant volume heat addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine,

(a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram)

(b) the network output

(c) the thermal efficiency

(d) the mean effective pressure for the cycle.

The gas constant of air is R = 0.287 kJ/kg.K

(Describe the necessary assumptions you have considered in your solutions.)

Design a power generation system by choosing one of the options given below.
1. Geothermal sourced power plant
 Define the geothermal power plant type (Total Flow/Flash/binary)
 Define turbine isentropic efficiency
 Show all the processes on a T-s diagram
 Calculate how much power can be generated
2. Wind Power system
 Assume Rayleigh wind regime
 Define wind turbine power capacity
 Define rated power of the turbine
 Define cut-in, cut out and rated wind speed of the turbine.
 Calculate annual energy generation
Make and indicate all the necessary assumption for your design.

It is better if both can be solved.

Would you recommend the use of magnetic particle testing for the detection of surface cracks in an aluminum object? Explain your answer.

b) How is magnetic particle testing used to detect surface cracks in objects?

In an intermediate superheated steam cycle, water vapor is 4 MPa pressure, 440 oC high, isentropic and 0.80 high
After entering the pressure turbine, it expands to 0.4 MPa and the intermediate superheater is again up to 440 oC.
it is heated and enters the low pressure turbine, whose isentropic efficiency is also 0.80. 40 oC from condenser
The fluid that works as a saturated liquid at temperature is pressed into the boiler with a pump with an isentropic efficiency of 0.90.
By accepting the entry of steam into the high pressure turbine as 1 point,
A) Show the cycle in the T-S diagram.
B) The degree of dryness of the steam at the outlet of the low pressure turbine
C) Thermal efficiency of the cycle
D) Calculate the second law efficiency of the cycle.

Briefly Discuss the attributes (max of three) of Product lifecycle Stages in Design and Manufacturing. Please limit yourself to one paragraph, max 6 lines. Please list attributes separately as items 1, 2 and 3:

0. Startup Stage

1. Growth Stage

2. Maturity Stage

3. Commodity Stage

a. State the difference between personal frequency and excitation frequency
b. State the difference in angular frequency and linear frequency
c. State the difference between transient response and steady state response
d. Mention the different meanings of eigenvalue and eigenvector in the vibration equation
e. Mention the difference between viscous and silencer d

Consider the two-dimensional laminar boundary layer flow of air over a wide 15 cm long flat plate whose surface temperature varies linearly from 20°C at the leading edge to 40°C at the trailing edge. This plate is placed in an airstream with a velocity of 2 m/s and a temperature of 10°C. Numerically determine how the surface heat flux varies along the plate.
Explain the results obtained with proper reasoning. Support your results with scaling analysis wherever possible.I need c++ program to solve the similarity equations.

6 m³/s recirculated room air at 22^oC T_db and 50% saturation, is mixed with 1.5 m³/s of incoming fresh air at 10^oC T_db and 6^oC T_wb. Determine all properties of the mixed air that you can get form the psychrometric chart (APPENDIX 2).

19.7 Consider an AISI 4135 steel in which all of the alloying elements have the mean or average value of their ranges.

(a) Determine its ideal critical diameter.

(b) Determine the maximum diameter of a bar of this material that can be quenched so as to obtain a 50 percent martensite–50 percent pearlite structure at its center when given a poor oil quench.

(c) Make the same computation, but now assume that the bar is given a brine quench.