Top 30 Multiple Choice Questions and Answers On Machine Design

TOP MOST Machine Design

Quiz

 

1. Guest’s theory of failure is applicable for following type of materials
   1.   brittle
   2.   ductile
   3.   elastic
   4.   plastic
2. Cold working
   1.   increases the fatigue strength
   2.   decreases the fatigue strength
   3.   has no influence on fatigue strength
   4.   alone has no influence on fatigue strength
3. In Vicker’s hardness testing, the pyramid indentor apex is
   1.   40°
   2.   122°
   3.   136°
   4.   152°
4. Coaxing is the procedure of increasing
   1.   metal strength by cycling
   2.   metal hardness by surface treatment
   3.   metal resistance to corrosion by coating
   4.   fatigue limit by overstressing the metal by successively increasing loadings
5. The property of a material which enables it to resist fracture due to high impact loads is known as
   1.   elasticity
   2.   endurance
   3.   strength
   4.   toughness
6. Tensile strength of a mild steel specimen can be roughly predicted from following
   hardness test
   1.   Brinell
   2.   Rockwell
   3.   Vicker
   4.   Shore’s sceleroscope
7. Resistance to fatigue of a material is measured by
   1.   Young’s modulus
   2.   coefficient of elasticity
   3.   elastic limit
   4.   endurance limit.
8. Which process will increase the fatigue duration of parts ?
   1.   finishing and polishing
   2.   shot-peening
   3.   decarburisation
   4.   electroplating
9. Rankine’s theory of failure is applicable for following type of materials
   1.   brittle
   2.   ductile
   3.   elastic
   4.   plastic
10. Stress concentration in static loading is more serious in
    1.   ductile materials
    2.   brittle materials
    3.   equally serious in both cases
    4.   depends on other factors
11. Other method of reducing shock load in the above case can be
    1.   to decrease length
    2.   to increase length
    3.   unaffected by length
    4.   other factors would decide same
12. Brittle coating technique is used for
    1.   determining brittleness
    2.   protecting metal against corrosion
    3.   protecting metal against wear and tear
    4.   experimental stress analysis
13. Stress concentration is caused due to
    1.   variation in properties of material from point to point in a member
    2.   pitting at’points or areas at which loads on a member are applied
    3.   abrupt change of section
    4.   all of the above
14. Stress concentration in cyclic loading is more serious in
    1.   ductile materials
    2.   brittle materials
    3.   equally serious in both cases
    4.   depends on other factors
15. The function of a washer is to
    1.   provide cushioning effect
    2.   provide bearing area
    3.   absorb shocks and vibrations
    4.   provide smooth surface in place of rough surface
16. The notch angle of the Izod impact test specimen is
    1.   10°
    2.   20°
    3.   30°
    4.   45°
17. Pick up wrong statement. Fatigue strength can be increased by
    1.   cold working
    2.   shot peening
    3.   grinding and lapping surface
    4.   hot working
18. The endurance limit of a material with finished surface in comparison to rough
    surface is
    1.   more
    2.   less
    3.   same
    4.   unpredictable
19. Maximum principal stress theory is applicable for
    1.   ductile materials
    2.   brittle materials
    3.   elastic materials
    4.   none of the above.
20. Resilience of a material is important, when it is subjected to
    1.   combined loading
    2.   shock loading.
    3.   thermal stresses
    4.   wear and tear
21. If a material fails below its yield point, failure would be due to
    1.   straining
    2.   fatigue
    3.   creep
    4.   sudden loading
22. The crest diameter of a screw thread is same as
    1.   major diameter
    2.   minor diameter
    3.   pitch diameter
    4.   core diameter
23. The following type of nut is used with alien bolt
    1.   alien nut
    2.   hexagonal nut
    3.   slotted nut
    4.   any one of the above.
24. A stud
    1.   has a head on one end and a nut fitted to the other
    2.   has head at one end and other end fits into a tapped hole in the other part to be joined
    3.   has both the ends threaded
    4.   has pointed threads
25. A tap bolt
    1.   has a head on one end and a nut fitted to the other
    2.   has head at one end and other end fits into a tapped hole in the other part o be joined
    3.   has both the ends threaded
    4.   has pointed threads
26. Cap screws are
    1.   similar to’small size tap bolts except that a greater variety of shapes of heads are available
    2.   slotted for a screw driver and generally used with a nut
    3.   used to prevent relative motion be-tween parts
    4.   provided with detachable caps
27. An alien bolt is
    1.   self locking bolt
    2.   same as stud
    3.   provided with hexagonal depression in head
    4.   used in high speed components
28. Ball bearing type screws are found in following application
    1.   screw jack
    2.   aeroplane engines
    3.   crane
    4.   steering mechanism
29. Set screws are
    1.   similar to small size tap bolts except that a greater variety of shapes of heads are available
    2.   slotted for a screw driver and generally used with a nut
    3.   used to prevent relative motion be-tween parts
    4.   similar to stud
30. A self locking screw has
    1.   fine threads
    2.   coarse threads
    3.   coefficient of friction > tangent of load angle
    4.   hole for inserting split pin

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