41⟩ Tell me what are various theories of failure?
The failure theories are:
☛ Maximum principal stress theory.
☛ Maximum shear stress theory.
☛ Maximum principal strain theory.
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66 Assistant Design Engineer Questions And Answers
42⟩ Explain me what is heat treatment and why is it done?
Heat treatment can be defined as a combination of processes or operations in which the heating and cooling of a metal or alloy is done in order to obtain desirable characteristics without changing the compositions. Some of the motives or purpose of heat treatment are as follows:
☛ > In order to improve the hardness of metals.
☛ > For the softening of the metal.
☛ > In order to improve the machinability of the metal.
☛ > To change the grain size.
☛ > To provide better resistance to heat, corrosion, wear etc.
Heat treatment is generally performed in the following ways:
☛ > Normalizing
☛ > Annealing
☛ > Spheroidising
☛ > Hardening
☛ > Tempering
☛ > Surface or case hardening
43⟩ Tell me what are the types of fracture?
The two types of fracture are
☛ Ductile fracture
☛ Brittle fracture
44⟩ What is endurance limit?
Endurance limit is the maximum value of completely reversed stress that the standard specimen can sustain an infinite number (106) of cycles without failure.
45⟩ Can you please explain the difference between repeated stress and reversed stress?
Repeated stress refers to a stress varying from zero to a maximum value of same nature.
Reversed stress of cyclic stress varies from one value of tension to the same value of compression.
46⟩ What is machinability?
It is the property of the material, which refers to a relative ease with which a material can be cut. It is measured in a number of ways such as comparing the tool life for cutting different material
47⟩ Tell me what is an accident?
An accident is a unexpected and unforeseen event which may or may not injury to a person or a machine tool.
48⟩ Tell me what is Representative Fraction?
It is the ratio of drawing to the object. R.F=Length of the object in the drawing /Actual length of the object.
49⟩ Explain me what is curved beam?
In curved beam the neutral axis does not coincide with the centroidal axis.
50⟩ Explain me what is impact load?
If the time of load application is less than one third of the lowest natural period of vibration of the part, it is called an impact load.
51⟩ Tell us briefly the following lines used in Engineering drawing?
☛ (a)Dimension Lines
☛ (b)Extension Lines
☛ (c)Leaders
Dimension lines are the thin lines used to indicate extents and direction of dimension. These are terminated with arrowheads.
Extension lines are also thin lines and it used to indicate the termination of a dimension.
Leaders are used to direct notes or identification symbols to feature on the drawing.
52⟩ Tell me what is a sketching?
This is freehand expression of the graphic language.
53⟩ Tell me some example for curved beam?
C frame, crane hook
54⟩ Explain me what is Engineering Drawing?
A drawing which is worked out an engineer for the engineering purpose is known as Engineering Drawing.
55⟩ Explain me what is Drafting machine(Mini Drafter)?
It is a device to do drawing work neatly and quickly.An attachment provided to move any position and may be adjusted at any required height.
56⟩ Tell me what are the precautions to be taken to avoid fire?
☛ 1) The buckets along with sand should be placed inside the workshop.
☛ 2) Switches and other electrical parts must be made of fireproof material.
☛ 3) Carbon dioxide gas should be place at required points in special containers.
☛ 4) Fire extinguishers of suitable type should be placed at accessible places.
57⟩ Tell me what are the various phases of design process?
The various phases of design process are:
☛ Recognition of need.
☛ Definition of problem
☛ Synthesis
☛ Analysis and optimization
☛ Evaluation
☛ Presentation
58⟩ Explain me stress concentration and stress concentration factor?
Stress concentration is the increase in local stresses at points of rapid change in cross section or discontinuities.
Stress concentration factor is the ratio of maximum stress at critical section to the nominal stress
59⟩ Tell me what is a Drawing?
It is a graphical representation of a real thing to define and specify the shape and size of a particular object by means of lines.
60⟩ Tell me what is a Centre line?
Centreline is a thin line in the form long and short dashes. It indicates area of symmetrical parts, circles and path of motion.
