Bearings Multiple Choice Questions and Answers - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. In hydrostatic bearing,
(A) The axis of journal is eccentric with respect to axis of bearing
(B) The axis of journal is concentric with respect to axis of bearing
(C) The axis can be either eccentric or concentric depending upon speed
(D) None of the above

2. The unit of viscosity is
(A) N/mm2
(B) N-mm
(C) N-s/mm2
(D) N-mm/s

3. The length to diameter ratio for a square bearing is
(A) More than 1
(B) Less than 1
(C) 8
(D) 1

4. For hydrodynamic lubrication
(A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space
(B) There should be external source like pump to supply lubricant under pressure
(C) There should be elastic deformation of the parts in contact
(D) There should be metal to metal contact

5. For hydrostatic lubrication
(A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space
(B) There should be external source like pump to supply lubricant under pressure
(C) There should be elastic deformation of the parts in contact
(D) There should be metal to metal contact

6. For elasto-hydrodynamic lubrication
(A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space
(B) There should be external source like pump to supply lubricant under pressure
(C) There should be elastic deformation of the parts in contact
(D) There should be metal to metal contact

7. In Petroff’s equation, it assumed that the lubricant film is
(A) Converging
(B) Diverging
(C) Uniform
(D) Converging diverging

8. A thick film bearing is a bearing
(A) Where the surfaces of journal and the bearing are completely separated by a film of lubricant
(B) Where the surfaces of journal and the bearing are partially separated by a film of lubricant and there is partial metal to metal contact
(C) Where the surfaces of journal and the bearing are separated by a film created by elastic deflection of parts
(D) Where there is no lubricant

9. In hydrodynamic bearing,
(A) The axis of journal is eccentric with respect to axis of bearing
(B) The axis of journal is concentric with respect to axis of bearing
(C) The axis can be either eccentric or concentric depending upon speed
(D) None of the above

10. The property of the bearing material to yield and adopt its shape to that of journal is called
(A) Embeddability
(B) Conformability
(C) Viscosity
(D) Endurance limit stress

11. As compared with oil with VI=80, a lubricating oil with VI=90
(A) Has more viscosity
(B) Has less viscosity
(C) Has more rate of change of viscosity with respect to temperature
(D) Has less rate of change of viscosity with respect to temperature

12. When the bearing is subjected to fluctuating or impact load the bearing characteristic number should be ________ times its minimum value
(A) 5 times
(B) 10 times
(C) 15 times
(D) 20 times

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