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New Satara Samuha Mumbai’s, New Satara College of Engineering & Management (Polytechnic),, Korti, Pandharpur, Unit Test-II, Programme Name: Mechanical Engineering, Programme Code: - ME, Semester: 5rd, 22564, Course Title: Elements of machine design, Date: 28 /10/2021, Marks: 20, Time: 2 P.M. To 3 P.M, , Instructions:, (1) All questions are compulsory., (2) Illustrate your answers with neat sketches wherever necessary., (3) Figures to the right indicate full marks., (4) Assume suitable data if necessary., (5) Preferably, write the answers in sequential order., , Q.1All Questions are compalsary ., , 10 Marks …….. CO 01., , 1) 30 Cr 13, 1) Alloy steel having carbon 0.3 % and chromium 13 %, 2) Alloy steel having carbon 13 % and chromium 0.3 %, 3) Mild steel having carbon 0.3 % and chromium 13 %, 4) other, , 2) SG 450/10, 1) Spheroidal graphite cast iron with minimum tensile strength 450 N/MM^2 followed by 10%, elongation, 2) Spheroidal graphite cast iron with minimum tensile strength 450 kN/MM^2 followed by 10%, elongation, 3) Spheroidal graphite cast iron with minimum tensile strength 45 N/MM^2 followed by 10%, elongatioa, 4) Spheroidal graphite cast iron with elongation 450 N/MM^2 followed by 10% minimum tensile, strength

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3) A load of 6 KN is to be raised by means of steel wire. Find the minimum wire diameter, required for safe stress of 100 MPa., 1) 10 mm, , 2) 9 mm, , 3) 7.97 mm, , 4) 11.44 mm, , 4) When a material is subjected to repetitive stresses, it fails at stresses below yield point stresses., such a type of failure is called as ....................., 1) Creep curve, , 2) Notch sensitivity, , 3) Endurance limite, , 4) Fatigue failure, , 5) Number of stages are created in the creep curve., 1) 2, , 2) 3, , 3) 1, , 4) 4, , 6) " The irregularity in stress distribution caused by abrupt changes from" is called as ................, 1) Creep curve, 3) Stress sensitivity, , 2) Faliure, 4) Notch sensitivity, , 7) The force of resistance per unit area offered by a body against the deformation is called, 1) modulus of rigidity, 3) stress, , 2) strain, 4) Design of material, , 8) ............................is defined as " the use of scientific principle, technical information and, imagination in the description of a machine or mechanical system to perform specific function ", 1) Machine design, , 2) Fundamental of design, , 3) Elements of design, , 4) Design of material, , 9) 'When the body is subjected to equal and opposite axial pull force, the stress produced or, induced in the body is called as ....................', 1) modulus of rigidity, 3) Tensile stress, , 2) compressive stress, 4) Design of material

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10) FG 210, 1) Gray cast iron with tensile strength 210 N/mm^2, 2) Gray cast iron with tensile strength 200 KN/mm^2, 3) Gray cast iron with tensile strength 200 MN/mm^2, 4) Gray cast iron with tensile strength 200 GN/mm^2, , Q.2 All Questions are compalsary ., , 10 Marks ….CO 02., , 11. Connecting rod of a reciprocating steam engine is subjected to maximum load pf 65 KN. find, the diameter of connecting rod at thinnest part, if permissible tensile stress os 35 MPa., 1) 48.63 mm, , 2) 45.67 mm, , 3) 55.03 mm, , 4) 40.02 mm, , 12) Calculate, Area A=?, Diameter of Rod (d) = 12 mm., 1) 148.63 mm, , 2) 145.67 mm, , 3) 113.09 mm, , 4) 114.02 mm, , 13) Type of shaft is, 1. Axle, a) False, , 2. Spindle, , 3.Counter shaft, , 4.Line staft, , b) True, , 14. The stress magnitude at top of the shaft is .,.......... and at stress magnitude at the bottom is, .......... and at centre ..............., 1) Zero, compressive , Tensile, , 2) compressive , Tensile, zero, , 3) Tensile , compressive , zero, , 4) Tensile , Tensile , Zero

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15) “ C “ is the ratio of ……………....., 1) outer diameter to inner diameter, 2) inner diameter to outer diameter, 3) inner diameter to inner diameter, 4) outer diameter to outer diameter, , 16. Find out the power generated in the machine it 1140 RPM and Twisting torque is 66.31x10^3., 1) 15 KW, , 2) 10KW, , 3) 10.5KW, , 4) 12KW, , 17) Example of Ductile material is ……, 1) Alluminium, , 2) Mild steel, , 3) Cast iron, , 4) concreate, , 18) The distance from Natural axis to top fibre of shaft is represented by ..........., 1) C, , 2) B, , 3) Y, , 4) A, , 19) Formula for Moment of inertia is, 1), , 2), , 3), , 4) none of above, , 20) Formula for bending stress for the solid shaft is, 1) Ϭ=, , 2) Ϭ=, , 3) both, , 4) none of above