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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