Machine Design Objective Questions and Answers - Set 24 - ObjectiveBooks

Machine Design Objective Questions and Answers - Set 24

Practice Test: Question Set - 24

1. In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called
    (A) Normal pitch
    (B) Axial pitch
    (C) Diametral pitch
    (D) Module

2. The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be
    (A) 12
    (B) 14
    (C) 18
    (D) 24

3. In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to
    (A) Reduce vibration
    (B) Reduce slip
    (C) Ensure uniform loading
    (D) Ensure proper alignment

4. According to Rankine's theory, the failure occurs at a point in a member
    (A) When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test
    (B) When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test
    (C) When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test
    (D) When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

5. Which one of the following loading is considered for the design of axles?
    (A) Bending moment only
    (B) Twisting moment only
    (C) Combined bending moment and twisting moments
    (D) Combined action of bending moment, twisting moment and axial thrust

6. Lewis equation in gears is used to find the
    (A) Tensile stress in bending
    (B) Shear stress
    (C) Compressive stress in bending
    (D) Fatigue stress

7. A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be
    (A) 5 mm
    (B) 10 mm
    (C) 15 mm
    (D) 25 mm

8. The elasticity is the property of a material which enables it to
    (A) Regains its original shape after deformation when the external forces are removed
    (B) Draw into wires by the application of a tensile force
    (C) Resists fracture due to high impact loads
    (D) Retain deformation produced under load permanently

9. A locking device extensively used in marine type connecting rod ends is a
    (A) Jam nut
    (B) Castle nut
    (C) Sawn nut
    (D) Ring nut

10. For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be
    (A) 4
    (B) 6
    (C) 8
    (D) 10

11. When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the
    (A) Initial tension
    (B) External load applied
    (C) Sum of the initial tension and external load applied
    (D) Initial tension or external load, whichever is greater

12. The shock absorbing capacity of a bolt can be increased by
    (A) Tightening it properly
    (B) Increasing shank diameter
    (C) Grinding the shank
    (D) Making shank diameter equal to core diameter of thread

13. According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)
    (A) d = t
    (B) d = 1.6 t
    (C) d = 2 t
    (D) d = 6 t

14. When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,
    (A) Bevel gearing
    (B) Helical gearing
    (C) Worm gearing
    (D) None of these

15. Which of the following statement is wrong?
    (A) The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets
    (B) The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole
    (C) The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm
    (D) According to I.B.R., the thickness of butt strap shall not be less than 5 mm

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