True or False

1. Ceramics often fracture below their theoretical strength due to cracks which concentrate the applied stress.

2. The interstitial diffusion coefficient for a small atom diffusing in a metal is usually larger than its diffusion coefficient via a vacancy mechanism.

3. BCC, HCP, FCC are all Bravais lattices belonging to the cubic crystal system.

4. The larger the number of slip systems available to a metal, the easier it is to deform.

5. HCP has an "abab" stacking sequence, FCC has an "abcabc" stacking sequence.

6. Dislocations move most easily in a crystal along the highest density planes along the lowest density direction.

7. There are 14 Bravais lattices, each of which belongs to one of the 7 crystal systems.

8. Elastic deformation results from the breaking and reforming of bonds.

9. Thermal expansion in crystalline materials is the result of an asymmetry in the repulsive and attractive force curves between pairs of atoms.

10.Graphite and diamond are two different phases of carbon.

Name and briefly explain different heat treatment operations carried on steels.

A regenerative gas turbine with intercooling and reheat operates at steady state (Figure Q2). Air enters the compressor at 100 kPa, 27°C with a mass flow rate of 6 kg/s. The pressure ratio across the two-stage compressor is 10. The pressure ratio across the two-stage turbine is also 10. The intercooler and reheater each operate at 300 kPa. At the inlets to the turbine stages, the temperature is 1127°C. The temperature at the inlet to the second compressor stage is 27°C. Assuming the compressors and turbines stages are reversible systems (100% efficiency). The regenerator effectiveness is 70%. Assuming that there is no pressure loss during intercooling, combustion and reheating process, and by using cold air standard assumption, sketch a T-s diagram for this regenerative Brayton-cycle and determine;

i) the thermal efficiency,

ii) the net power developed (kW),

iii) back work ratio.

Why with decreasing grain size there is decrease in impact transition temperature?

Why does diesel engine initiate 2 stage fuel injection?

What is the reason for that?

Describe the design experiments method for product and process optimization

What are the general principles of DFA? What are the steps to minimize the number of parts for an assembly?

where do atheism and christianity agree and disagree on views of the origin of the universe?

Describe 2 alternative processing approach of tool steels that enables fine and homogenous primary carbide distributions.

1. Identify and describe the four domains of Axiomatic Design

2. Why would we use Axiomatic Design or Quality Function Deployment in the design of a process and simulation model?

3. Why do we flowchart processes prior to simulation?

Explain the meaning of the following terms with respect to professional engineering practice :

a) Lump sum contract

b) Confidential disclosure

c) ACCC

d) Continuing professional development

e) Incident reports

f) Risk assessment

g) Breach of contract

h) Common law

i) Preliminary negotiations

j) Patent

Air is supplied to a convergent–divergent nozzle from a
reservoir where the pressure is 100 kPa. The air is then discharged
through a short pipe into another reservoir where the pressure
can be varied. The cross-sectional area of the pipe is twice the
area of the throat of the nozzle. Friction and heat transfer may be
neglected throughout the flow. If the discharge pipe has constant
cross-sectional area, determine the range of static pressure in the
pipe for which a normal shock will stand in the divergent section
of the nozzle. If the discharge pipe tapers so that its cross-sectional
area is reduced by 25%, show that a normal shock cannot be drawn
to the end of the divergent section of the nozzle. Find the maximum
strength of shock (as expressed by the upstream Mach number) that
can be formed.

With a flowchart showing the overall activities in the production of a part or component, show the stage where the material of the part or component is determined.

state the three fan laws for variation in speed as well as three laws for variation in density