Download DBATU (Dr. Babasaheb Ambedkar Technological University) B Tech 2019 Oct-Nov (Bachelor of Technology) Mech 1st Sem Machine Design I Question Paper
DR.IBA11ASAHEB AMBEDKAR'TECHNOLOGICAL UNIVERSITY, LONERE
? T)? . ' . Mid Semester' Examination ? Sept./Oct. 2019
" Course: B. Tech in _MECHANICAL ENGINEERING 3 Sem: I
Subject Name: MACHINE DESIGN-I
Max Marks: 20? "
Insti'uctions t0 the Students: .
1.Assume the suitable data where ever necessary
2. Draw appropriate ?gures where ever necessary
Subject Code: BTMEC 503
Datez-Q?-C].Iq Durationz-l Hr.
(Level/CO) Marks
Q. 1 State True or False
6
? 1. Standards are obligatory norms CO] 1
2 Ergonomics design is relation between man and machine C01 1
3 Brittle material shows negligible deformation before fracture C01 1
4. Factor of safety indicates strength of the material . C01 1
I 5 Endurance limit is criteria of failure for components subjected to external C01 1
?uetuating load.
6. Maximum principal stress theory is the most suitable theory for ductile C04 1
materials
Q.2 ? Solve Any Two of the following. . . 3 X 2
(A) In a Knuckle joint, force acting lS 25kN.Mater1a1 101 the pin and the rod 15 CO2 and
45C8, Syt=38ON/mm2. FOS is 2.5. The yield strength ingshear 57.7% of Syt. _ C03 ?
Calculate diameter of rod and Pin. Neglect ben 11111.3 of pin.
(B) An axial pull of 12kN and a transverse shear force u?. (11
by using maximum shear stress theory. I i
(C) Discuss aesthetic factors in design. , C01
Q. 3 Solve Any One of the following. 8
(A) The work cycle of a mechanical components sub1e'cted to a completely C05
' reversed bending stresses consists of the following three elements, I
i350N/mm2 for 85% of time, iSOON/mmZ for .1? % {1f 11 fe and $400 for
remaining part of the life. The component is "made of 5001 (Sm=660N/mm2),1f
the' endurance limit of the component is 78ON/ 111112 D ?tevmme its life
(B) A plate made up 0 40C8 ,(Sut=580N/mm2 ) as shown 15 subjected to , COS
completely reverSed axial force of 40 kN. The theoretical stress concentration
factor at the change in the cross section is 2.27 and notch sensitivity is 0.8.
The surface ?nish factor and the size factor are 0.75 and 0.85 respectively. The
load factor is 0.923. The expected reliability is 90%,
factor if 0.897. If the required facter o?f?s'a ?
thickness for in?nite life; ? ' M
A?"
for which reliability
fety is 2, determine the plate
3%me
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40H: End ?new;
This post was last modified on 21 January 2020