21⟩ Explain me what are the different types of detail drawings?
☛ 1) Pattern detail drawings
☛ 2) Stamping detail drawings
☛ 3) Casting detail drawings
☛ 4) Welding detail drawings
☛ 5) Forging detail drawings
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65 Automobile Designer Questions And Answers
22⟩ Please explain the advantages of Cycloidal and Involute gears?
The advantages of the Cycloidal gears are as follows:
☛ > Having a wider flank as compared to Involute gears they are considered to have more strength and hence can withstand further load and stress.
☛ > The contact in case of cycloidal gears is between the concave surface and the convex flank. This results in less wear and tear.
☛ > No interference occurs in these types of gears.
☛ The advantages of Involute gears are as follows:
☛ > The primary advantage of involute gears is that it allows the changing of the centre distance of a pair without changing the velocity ratio.
☛ > The pressure angle remains constant from start to end teeth, this results in less wear and smooth running of the gears.
☛ > The involute gears are easier to manufacture as they can be generated in a single curve ( the face and flank ).
23⟩ Tell me is it essential to show all the hidden lines in dotted in a assembly drawing?
Generally hidden lines are omitted from the sectional view and not essential to show all hidden lines in assembly drawing. If it is necessary to show more clearly a hidden part in the section or aiding in dimensioning the view, they may be drawn.
24⟩ Tell me what is a Helix?
It is a curve which is generated by a point moving at uniform rate around and advancing parallel to, or at varying distances from an axis.
25⟩ Tell us in an orderly manner how the force in the member of a truss be detected using the method of joint?
The steps required to calculate the force are as follows:
☛ > The reaction at the support has to be first calculated.
☛ > Once the reaction is calculated the direction of force of the member is made to make it tensile. On getting the result to be negative the direction assumed is wrong and this implies the force being compressive in nature.
☛ > A joint needs to be selected whose 2 members are not known. The lami`s theorem is used on the joint on which less than three forces are acting.
☛ > After the above process is complete the free body diagrams of the joint needs to be made. Since the system is in equilibrium the condition of Summation of V and H must result in zero.
☛ > After the above step the resolution of forces method needs to be used on the joint on which more than 4 forces are acting.
26⟩ Tell me what do you mean by projectors?
Projectors are the imaginary lines drawn from the object to the plane.
27⟩ Stress concentration factor is defined as ratio of (a) Max stress to endurance limit (b) Nominal stress to endurance limit (c) Max stress to nominal stress (d) Nominal stress to max stress
(c) Max stress to nominal stress
28⟩ When two elastic bodies collide with each other (a) Two bodies will momentarily come to rest after collision (b) The two bodies tend to compress & deform at the surface of contact (c) Two bodies begins to retain their original shape (d) All of the above
(d) All of the above
29⟩ What size of material required for making rolled threads? (a) Pitch diameter (b) Root diameter (c) Major diameter (d) None
(a) Pitch diameter
30⟩ Explain the difference between Size dimension and Location dimension?
(a)Size Dimension :It describes the size of an object such as length ,width, thickness, depth, diameter etc.
(b)Location Dimension: A location dimension describes the location of constructional parts within an object .It includes location of holes, slots, grooves etc.
31⟩ Centre of pressure of an aerofoil with an increase of angle of attack will (a) Move forward (b) Move backward (c) Not move (d) None of the above
(a) Move forward
32⟩ Thermal efficiency of a gas turbine plant as compared to diesel engine plant (a) Higher (b) Lower (c) Same (d) May be higher or lower
(a) Higher
33⟩ Tell me what are Bevel Gears and what are its types?
Bevel gears are the type of gears in which the two shafts happen to intersect. The gear faces which are tooth bearing are conical in shape. They are generally mounted on shafts which are 90 degrees apart but they can be made to work at other angles as well. The bevel gears are classified into the following types on the basis of pitch surfaces and shaft angles:
☛ > Mitre Gears: These types of gears are similar to each other ie. they have the same pitch angles and contain the same number of teeth. The shaft axes intersect at 90 degrees angle.
☛ > Angular bevel gears: When two bevel gears connect at any angle apart from 90 degrees.
☛ > Crown bevel gears: When the two shaft axes intersect at an angle greater than 90 and one of the bevel gears have a pitch angle of 90 degrees they are known as crown bevel gears.
☛ > Internal bevel gears: In these type of gears the teeth on the gears is cut on the inside area of the pitch cone.
34⟩ Teflon is used for bearings because of (a) Low co-efficient of friction (b) Better heat dissipation (c) Smaller space constraint (d) All of the above
(a) Low co-efficient of friction
35⟩ Antifriction bearings are (a) Thick lubricated bearing (b) Thin lubricated bearing (c) Ball & roller bearing (d) Plastic bearing
(c) Ball & roller bearing
36⟩ A closed cycle gas turbine works on (a) Carnot cycle (b) Rankine cycle (c) Joule cycle (d) Atkinson cycle
(c) Joule cycle
37⟩ Mass balancing is done to (a) Avoid flutter (b) Increase bending stress (c) Reduce drag (d) Distributing mass on control surface
(a) Avoid flutter
38⟩ Principle effect of humidity is (a) Corrosion (b) Leaking from sealed enclosures (c) Permanent set of packing and gaskets (d) Differential contraction of metal parts
(a) Corrosion
39⟩ Tell me what are the method of development?
☛ 1. Parallel Line Development: It is used for patterns of prisms and cylinders.
☛ 2. Radial Line Development: This is used for surfaces of regular tapering forms such as pyramids and corns.
☛ 3. Triangulation Development: It is used when the connecting surface is neither prismatic nor pyramidal such as developing warped and double curved surfaces.
40⟩ What is position of views in First Angle Projection?
In first angle projection the top view is positioned below the front view with the left side view of the object to the right side of the front view.
