Mechanical Engineering - Machine Design - Design of Shafts and Keys

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Question - 1

The type of stress(es) developed in the key is/are

  • A shear stress
  • B bearing stress
  • C Both (a) and (b)
  • D None of the above

Question - 2

A keyway lowers

  • A the strength of the shaf
  • B the rigidity of the shaft
  • C Both (a) and (b)
  • D the ductility of the material of the shaft

Question - 3

A feather key is generally

  • A loose in shaft and tight in hub
  • B tight in shaft and loose in hub
  • C loose in both shaft and hub
  • D tight in both shaft and hub

Question - 4

Oldham coupling is used to connect two shafts

  • A which have lateral misalignment
  • B whose axes intersect at a small angle
  • C which are perfectly aligned
  • D which are not in exact alignment

Question - 5

A sliding bearing which can support steady loads without any relative motion between the journal and the bearing is called

  • A zero film bearing
  • B boundary lubricated bearing
  • C hydrostatic lubricated bearing
  • D hydrodynamic lubricated bearing

Question - 6

If Z = absolute viscosity of the lubricant in kg/m-s, N = speed of the journal in rpm and p = bearing pressure in N/mm2 then, the bearing characteristic number is

  • A \(\cfrac { Z }{ pN } \)
  • B \(\cfrac { pN }{ Z } \)
  • C \(\cfrac { ZN }{ p } \)
  • D \(\cfrac { Zp }{ N } \)

Question - 7

The tapered roller bearings can take

  • A Only radial load
  • B Only axial load
  • C Both (a) and (b)
  • D None of these

Question - 8

Ball and roller bearings in comparison to sliding bearings have

  • A small overall dimensions
  • B low starting and running friction
  • C more accuracy in alignment
  • D All of the above

Question - 9

The ball bearings are usually made from

  • A high speed steel
  • B medium carbon steel
  • C Both (a) and (b)
  • D chrome nickel steel

Question - 10

The piston pin bearings in heavy duty diesel engines are

  • A needle roller bearings
  • B tapered roller bearings
  • C cylindrical roller bearings
  • D spherical roller bearings