The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is___________________?

Related Mcqs:

1. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?

   A. ZN/p
   B. p/ZN
   C. Z/pN
   D. N/Zp
   E. Zp/N

2. In hydrodynamic bearings_____________________?

   A. the oil film pressure is generated only by the rotation of the journal
   B. the oil film is maintained by supplying oil under pressure
   C. do not require external supply of lubricant
   D. grease is used for lubrication
   E. none of the above

3. Basic shaft is one__________________?

   A. whose upper deviation is zero
   B. whose lower deviation is zero
   C. whose lower as well as upper deviations are zero
   D. does not exist
   E. none of the above

4. A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?

   A. wood-ruff key
   B. feather key
   C. flat saddle key
   D. gib head key
   E. hollow saddle key

5. A key capable of tilting in a recess milled out in a shaft is known as______________________?

   A. wood-ruff key
   B. feather key
   C. flat saddle key
   D. gib head key
   E. hollow saddle key

6. Ball bearing type screws are found in following application_____________________?

   A. screw jack
   B. aeroplane engines
   C. crane
   D. steering mechanism
   E. bench vice

7. Oil in journal bearing should be applied at the point where load is________________?

   A. nil or lightest
   B. maximum
   C. average
   D. any one of the above
   E. unpredictable

8. The rated life of a bearing varies___________________?

   A. directly as load
   B. inversely as square of load
   C. inversely as cube of load
   D. inversely as fourth power of load
   E. none of the above

9. An alien bolt is___________________?

   A. self locking bolt
   B. same as stud
   C. provided with hexagonal depression in head
   D. used in high speed components
   E. provided with countersunk head

10. Spring index is___________________?

    A. ratio of coil diameter to wire diameter
    B. load required to produce unit deflection
    C. its capability of storing energy
    D. indication of quality of spring
    E. nothing