Sliding Contact Bearings MCQ Practice Test - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. A zero film bearing is a bearing
(A) Where the surfaces of journal and the bearing are separated by a thick 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

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

3. Boundary lubricated bearing is
(A) Thick film bearing
(B) Thin film bearing
(C) Hydrodynamic bearing
(D) Hydrostatic bearing

4. Compared with Babbitt, bronze
(A) Is cheaper
(B) Has high strength
(C) Can withstand high pressure
(D) Has all three characteristics

5. Sommerfeld number is
(A) Similar to bearing characteristic number
(B) Similar to Reynold’s number
(C) Dimensionless parameter that contains all the design parameters
(D) Used to find out dynamic load carrying capacity of the hydrodynamic bearing

6. If µ = absolute viscosity, N= speed of the journal and p = unit bearing pressure, then the bearing characteristic number is given by
(A) μN/p
(B) μp/N
(C) pN/μ
(D) μ/pN

7. The popular bearing material is Babbitt because it has
(A) Excellent conformability
(B) Excellent embeddability
(C) Ability to be used in form of thin strip
(D) All three characteristics

8. In hydrodynamic bearing, when the shaft begins to rotate in clockwise direction,
(A) The journal climbs to the right side of the bearing without metal to metal contact
(B) The journal climbs to the left side of the bearing without metal to metal contact
(C) The journal sinks down to the bottom of the bearing
(D) The journal is at the center of the bearing

9. In case of partial bearing, the angle of contact of the bushing with the journal is usually
(A) 120°
(B) 180°
(C) 45°
(D) 360°

10. The property of the bearing material to allow the dust and abrasive particles to get absorbed on the surface of the lining is called
(A) Embeddability
(B) Conformability
(C) Viscosity
(D) Endurance limit stress

11. In case of full journal bearing, the angle of contact of the bushing with the journal is
(A) 60°
(B) 90°
(C) 180°
(D) 360°

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

13. Petroff’s equation is used to find out
(A) Load carrying capacity of the bearing
(B) Frictional losses in the bearing
(C) Unit bearing pressure on the bearing
(D) Pressure distribution around the periphery of the journal

14. A thin 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

15. In case of partial bearing, the angle of contact of the bushing with the journal is
(A) 270°
(B) More than 180°
(C) Less than 180°
(D) 360°

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