Machine Design(Mechanical Engineering ) Questions and Answers

Question 1. In thrust bearings, the load acts
  1.    Along the axis of rotation
  2.    Parallel to the axis of rotation
  3.    Perpendicular to the axis of rotation
  4.    In any direction
Explanation:-
Answer: Option A. -> Along the axis of rotation
Question 2. The helix angle for single helical gears ranges from
  1.    10° to 15°
  2.    15° to 20°
  3.    20° to 35°
  4.    35° to 50°
Explanation:-
Answer: Option C. -> 20° to 35°
Question 3. Failure of a material is called fatigue when it fails
  1.    At the elastic limit
  2.    Below the elastic limit
  3.    At the yield point
  4.    Below the yield point
Explanation:-
Answer: Option D. -> Below the yield point
Question 4. For steel, the ultimate strength in shear as compared to ultimate strength in tension is
  1.    $$\frac{1}{2}$$
  2.    $$\frac{1}{3}$$
  3.    $$\frac{1}{4}$$
  4.    $$\frac{2}{3}$$
Explanation:-
Answer: Option D. -> $$\frac{2}{3}$$
Question 5. The strap end of a connecting rod of steam engine is joined by
  1.    Gib of cotter joint
  2.    Sleeve and cotter joint
  3.    Spigot socket cotter joint
  4.    Knuckle joint
Explanation:-
Answer: Option A. -> Gib of cotter joint
Question 6. The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as
  1.    Bondability
  2.    Embeddability
  3.    Comformability
  4.    Fatigue strength
Explanation:-
Answer: Option C. -> Comformability
Question 7. Antifriction bearings are
  1.    Sleeve bearings
  2.    Hydrodynamic bearings
  3.    Thin lubricated bearings
  4.    None of the above
Explanation:-
Answer: Option D. -> None of the above
Question 8. Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?
  1.    Woodruff key
  2.    Feather key
  3.    Gib-head key
  4.    Tangent key
Explanation:-
Answer: Option D. -> Tangent key
Question 9. The cold working of metals is carried out __________ the recrystallization temperature.
  1.    Above
  2.    Below
  3.    At
  4.    None of these
Explanation:-
Answer: Option B. -> Below
Question 10. The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as
  1.    $$\frac{{{{\text{K}}_{\text{f}}} + 1}}{{{{\text{K}}_{\text{t}}} + 1}}$$
  2.    $$\frac{{{{\text{K}}_{\text{f}}} - 1}}{{{{\text{K}}_{\text{t}}} - 1}}$$
  3.    $$\frac{{{{\text{K}}_{\text{t}}} + 1}}{{{{\text{K}}_{\text{f}}} + 1}}$$
  4.    $$\frac{{{{\text{K}}_{\text{t}}} - 1}}{{{{\text{K}}_{\text{f}}} - 1}}$$
Explanation:-
Answer: Option B. -> $$\frac{{{{\text{K}}_{\text{f}}} - 1}}{{{{\text{K}}_{\text{t}}} - 1}}$$
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