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InsemAug 20252019 patternTE Mech

Design of Machine Elements (DME) SPPU Insem Question Paper Aug 2025

All 4 questions from this SPPU insem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated DME questions
Subject code
302043
Pattern
2019 pattern
Exam
Insem
Session
Aug 2025
Max. marks
30
Time
1 Hour
Semester
I
Paper code
[6579]-372

Printed for: T.E. (Mechanical/ Mechanical S .W. ) (Insem)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right side indicate full marks.
  4. Assume suitable data, if necessary.

Questions

  1. Q1

    1. a)

      A knuckle joint is subjected to an axial load of 25 kN. It is made of plain carbon steel with yield strength in tension 760 MPa. Design the joint for FOS = 5. Take compression strength 20% more than tensile strength and shear strength is 0.577 of tensile strength.

      [8]
    2. b)

      Define Factor of Safety and service factor? Explain the factors to be considered while selecting the factor of safety.

      [7]

  2. Q2

    1. a)

      Design a right angled bell cranked lever. The horizontal arm is 500 mm long and a load of 4.5 kN acts vertically downwards. At the end of 150 mm long arm which is perpendicular to another arm, a force P acts at right angle to axis of 150 mm arm through a pin into a forked end. The lever consists of forged steel material and a pin at the fulcrum.

      [10]
    2. b)

      A column of uniform cross section is shown in following figure. If the permissible strength of the material is 70 MPa. Determine Dimensions of cross section. Also find direct and bending stress. W 2 UNIT - II

      [5]

  3. Q3

    1. a)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]
    2. b)

      Explain function of the key. What is the effect of keyways cut into the shaft? Explain the different types of Keys with neat diagrams.

      [7]

  4. Q4

    1. a)

      Two 35 mm shafts are connected by a flange coupling. Flange are fitted by 6 bolts on PCD 125 mm shaft transmits torque 800 N - m at 350 rpm. Calculate i) Key dimensions; ii) Hub length; iii) Thickness of flange; iv) Diameter of bolts; v) Power transmitted. Assume bolts are fitted in large clearance holes. Take For shaft,  = 63 MPa; For key,  = 46 MPa, for bolt,  = 56 MPa; for flange,  = 10 MPa

      [10]
    2. b)

      Show that the Crushing stress induced in a square key is twice the shear stress. 

      [5]