Machine Design problems
- 1. The square threads are not so strong as V-threads but they offer less frictional resistance to motion than Whitworth threads.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 2. The pipe joint mostly used for pipes carrying water at low pressures is
Options- A. socket joint
- B. nipple joint
- C. union joint
- D. spigot and socket joint Discuss
Correct Answer: socket joint
- 3. A column is known as a long column if the slenderness ratio is
Options- A. 40
- B. 50
- C. 70
- D. 100 Discuss
Correct Answer: 100
- 4. The resistance to fatigue of a material is measured by
Options- A. elastic limit
- B. Young's modulus
- C. ultimate tensile strength
- D. endurance limit Discuss
Correct Answer: endurance limit
- 5. The value of stress concentration factor depends upon
Options- A. material of the part
- B. geometry of the part
- C. material and geometry of the part
- D. none of these Discuss
Correct Answer: material and geometry of the part
- 6. For unequal width of butt straps, the thickness of butt straps are
Options- A. 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
- B. 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
- C. 0.75 t for both the straps on the inside and outside
- D. 0.625 t for both the straps on the inside and outside Discuss
Correct Answer: 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
- 7. According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)
Options- A.
d2 x ? x n - B. 1.875 x d2 x ? x n
- C. 2 x d2 x ? x n
- D. 3 x d2x ? x n
Discuss
Correct Answer: 1.875 x
d2 x ? x n - 8. Which of the following statement is correct for gears?
Options- A. The addendum is less than dedendum
- B. The pitch circle diameter is equal to the product of module and number of teeth
- C. The pitch circle is always greater than the base circle
- D. all of the above Discuss
Correct Answer: all of the above
- 9. Slenderness ratio is the ratio of
Options- A. maximum size of column to minimum size of column
- B. width of column to depth of column
- C. effective length of column to least radius of gyration of the column
- D. effective length of column to width of column Discuss
Correct Answer: effective length of column to least radius of gyration of the column
- 10. Screws used for power transmission should have
Options- A. Low efficiency
- B. high efficiency
- C. very fine threads
- D. strong teeth Discuss
Correct Answer: high efficiency
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