Be-e Mechanical System Design MCQ Test April-20

30 Questions | Total Attempts: 109

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Be-e Mechanical System Design MCQ Test April-20

TOTAL MARKS-30 TOTAL TIME: 1 HOUR


Questions and Answers
  • 1. 
    A cylinder is considered as thin cylinder when the ratio of inner diameter to the wall thickness is, 
    • A. 

      More than 15 

    • B. 

      Less than 15

    • C. 

      Equal to 15

    • D. 

      None of these criteria 

  • 2. 
    A cylinder is considered as thick cylinder when the ratio of inner diameter to the wall thickness is, 
    • A. 

      More than 15

    • B. 

      Less than 15

    • C. 

      Equal to 15

    • D. 

      None of these criteria 

  • 3. 
    In thin cylinders, the longitudinal stress is, 
    • A. 

       2(circumferential stress) 

    • B. 

       1/2(circumferential stress) 

    • C. 

      1/4(circumferential stress) 

    • D. 

       4(circumferential stress) 

  • 4. 
    In thick cylinders, the axial stress across the thickness of cylinder  
    • A. 

      Remains uniform throughout

    • B. 

       varies from internal pressure at the inner surface to zero at the outer surface 

    • C. 

      Varies from maximum value at the inner surface to minimum value at the outer surface 

    • D. 

       varies from maximum value at the outer surface to minimum value at  the inner surface 

  • 5. 
    The thickness of thick cylindrical shell with closed ends and made of brittle material is determined by
    • A. 

       Lame’s equation 

    • B. 

       Clavarino’s equation 

    • C. 

       Birnie’s equation 

    • D. 

      Barlow’s equation

  • 6. 
    The ratio of length of stroke to cylinder bore (l/D) is usually,
    • A. 

       1/2 

    • B. 

       5 

    • C. 

       1.5 

    • D. 

       1/4 

  • 7. 
    Connecting rod is made of, 
    • A. 

       aluminium 

    • B. 

       medium carbon steel 

    • C. 

       cast iron 

    • D. 

       babbits

  • 8. 
    The function of piston skirt is 
    • A. 

       to provide bearing surface for side thrust 

    • B. 

       to support gas load 

    • C. 

       to support gudgeon pin 

    • D. 

       to seal the cylinder and prevent leakage of oil past piston 

  • 9. 
    The design of piston head is based on, 
    • A. 

       strength and rigidity considerations 

    • B. 

       bending and torsional moments 

    • C. 

       buckling consideration 

    • D. 

       strength and heat transfer considerations 

  • 10. 
     Cylinder thickness is calculated on the basis of
    • A. 

       radial stress 

    • B. 

       residual stress 

    • C. 

       whipping stress 

    • D. 

       circumferential hoop stress 

  • 11. 
     Automotive crankshafts are made by, 
    • A. 

       casting process 

    • B. 

       machining from rolled stock 

    • C. 

      Drop forging process 

    • D. 

       welding process 

  • 12. 
    The bolts for the cap of big end of connecting rod are subjected to 
    • A. 

       only gas force 

    • B. 

       only inertia force 

    • C. 

       only side thrust   

    • D. 

       inertia force, gas force and side thrust 

  • 13. 
    The condition for connecting rod to be equally strong in plane of motion  (XX) and a plane perpendicular to plane of motion (YY) is, 
    • A. 

       Ixx =  Iyy 

    • B. 

       Ixx = 4 Iyy 

    • C. 

       4 Ixx =  Iyy 

    • D. 

       Ixx = 2 Iyy 

  • 14. 
     Autofrettage is, 
    • A. 

       a surface coating process of cylinders for corrosion resistance

    • B. 

       a heat treatment process for cylinders to relieve residual stresses 

    • C. 

      A process of pre-stressing the cylinder to develop residual compressive stress at the inner surface 

    • D. 

      A surface hardening process of cylinder to improve wear resistance

  • 15. 
    Class 3 pressure vessels are to be designed according to ‘Code for unfired vessel IS-2825’ when, 
    • A. 

       operating pressure is less than 17.5 kgf/cm2 

    • B. 

      Operating temperature is more than 00C and less than 2500C    

    • C. 

       thickness of shell is less than 16 mm 

    • D. 

      Any one of the above 

  • 16. 
    The end-closure for tall vertical pressure vessel is 
    • A. 

       hemispherical head 

    • B. 

       conical head 

    • C. 

       torispherical head 

    • D. 

      Flat head 

  • 17. 
    The end-closure for tankers of milk, petrol or diesel is  
    • A. 

       hemispherical head 

    • B. 

       conical head 

    • C. 

      Torispherical head 

    • D. 

       flat head 

  • 18. 
     Weld joint efficiency is maximum when the pressure vessel is welded by 
    • A. 

       single-welded butt joint with backing strip 

    • B. 

       single-welded butt joint without backing strip

    • C. 

       double-welded butt joint with full penetration 

    • D. 

       none of the above 

  • 19. 
    While designing pressure vessels according to ‘Code for unfired vessel IS-2825’, the design pressure is taken as 
    • A. 

       1.05(maximum operating pressure) 

    • B. 

      1.5(maximum operating pressure) 

    • C. 

       2(maximum operating pressure) 

    • D. 

       1.3(maximum operating pressure) 

  • 20. 
     The design of piston head is based on
    • A. 

      Strength and rigidity considerations 

    • B. 

      Bending and torsional moments 

    • C. 

       buckling consideration 

    • D. 

       strength and heat transfer considerations 

  • 21. 
    Select a functional requirement Parameter from the options given
    • A. 

      Size

    • B. 

      Cost

    • C. 

      Weight

    • D. 

      Energy  Storing Capacity

  • 22. 
    Adequate design is the design which fulfills the main.................... requirements
    • A. 

      Cost

    • B. 

      Concept

    • C. 

      Dimensional

    • D. 

      Functional

  • 23. 
    Optimum design is...................of adequate design
    • A. 

      Exclusive

    • B. 

      Inclusive

    • C. 

      Concept

    • D. 

      None of the Above

  • 24. 
    An optimum design means the best or most suitable of all the feasible............designs
    • A. 

      Available

    • B. 

      Aesthetic

    • C. 

      Conceptual

    • D. 

      None of these

  • 25. 
    For a Component there can be .........adequate designs,but there is only........optimum design
    • A. 

      No.of, Few

    • B. 

      Many, Some

    • C. 

      Several, One

    • D. 

      None of these

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