Design of Machine Elements MCQs with answers Page - 9

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Admin • 831.35K Points
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Q. Flexible shafts have rigidity in bending moment.

  • (A) high
  • (B) low
  • (C) very high
  • (D) extremely low

A

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Q. A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at θ with horizontal.

  • (A) psinθ(sinθ+cosθ)/hl
  • (B) p(sinθ+cosθ)/hl
  • (C) pcosθ(sinθ+cosθ)/hl
  • (D) none of the listed

A

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Q. Maximum shear stress in transverse fillet weld of leg h and length l is

  • (A) p/hl
  • (B) 1.21p/hl
  • (C) p/1.21hl
  • (D) none of the listed

A

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Q. Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

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Q. Saddle key is more suitable than sunk key for heavy duty applications.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

A

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Q. The main advantage of sunk key is that it is a drive.

  • (A) positive
  • (B) negative
  • (C) neutral
  • (D) none of the listed

A

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Q. Woodruff key permits movement b/w shaft and the hub.

  • (A) axial
  • (B) radial
  • (C) eccentric
  • (D) none of the listed

A

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Q. Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.

  • (A) 49mm
  • (B) 36mm
  • (C) 46mm
  • (D) 53mm

A

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Q. Refer to fig.
Two plates are fastened by means of two bolts.
The yield strength of bolt is 400N/mm² and factor of safety is 4.
Determine the permissible shear stress in the bolts.

  • (A) 100n/mm²
  • (B) 50n/mm²
  • (C) 25n/mm²
  • (D) 75n/mm²

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