Multiple Choice Questions (MCQ) with Answers on Journal or Plain bearings

Multiple Choice Questions (MCQ) with Answers on Journal or Plain bearings

 

1-The following is (are) the example(s) of Plain bearing(s).

  1. Thrust bearing
  2. Linear bearing
  3. Journal bearing
  4. All of the above

(Ans: d)

 

2-The following type(s) of bearing(s) have no rolling element.

  1. Thrust bearing
  2. Linear bearing
  3. Journal bearing
  4. All of the above

(Ans: d)

 

3-Which type of bearing(s) provides a bearing surface for forces acting along axis to the shaft?

  1. Thrust bearing
  2. Journal bearing
  3. Linear bearing
  4. None of the above

(Ans: a)

 

4-A sleeve bearing of inch dimensions is numbered as XXYY-ZZ, using the SAE numbering system. What does YY represents.

  1. Internal diameter in sixteenths of inch
  2. Internal diameter in inch
  3. External diameter in sixteenths of inch
  4. External diameter in inch

(Ans: c)

 

5-The type of bearing used in crankshaft is

  1. Plain bearing
  2. Roller bearing
  3. Ball bearing
  4. Magnetic bearing

(Ans: a)

 

6-Babbitt is used

  1. Usually to make integral bearings
  2. to not to damage the journal bearing during direct contact
  3. to collect any contaminants in the lubrication
  4. All of the above

(Ans: d)

 

7-For Ovens and dryers, the following material is used to make bearings

  1. Babbitt
  2. Graphite alloy
  3. Cast iron
  4. Bronze

(Ans: b)

 

8-The lubrication in which load of bearing is carried solely by a film of fluid and there is no contact between the two bearings surface is called

  1. Full film condition
  2. Boundary condition
  3. Dry condition
  4. None of the above

(Ans: a)

 

9-The lubrication in which load of bearing is carried partly by a film of fluid and partly by direct surface contact is called

  1. Full film condition
  2. Boundary condition
  3. Dry condition
  4. None of the above

(Ans: b)

 

10- When the load of bearing is carried by direct surface to surface contact is called

  1. Full film condition
  2. Boundary condition
  3. Dry condition
  4. None of the above

(Ans: c)

 

11-Hydrostatic bearing usually use ____ as lubricant

  1. Oil
  2. Grease
  3. Nothing
  4. Any of the above

(Ans: a)

 

12-Hydrostatic bearing enters Hydrodynamic state when the journal is

  1. Stationery
  2. Rotating
  3. Both ‘a’ and ‘b’
  4. None of the above

(Ans: b)

 

13- The location of journal is measured by

  1. Attitude angle
  2. Pressure angle
  3. Wedge angle
  4. None of the above

(Ans: a)

 

14-The attitude angle and eccentricity ratio are dependent on the

  1. Direction
  2. Speed of rotation
  3. The load
  4. All of the above

(Ans: d)

 

15-A self-excited vibration of the journal is called

  1. Oil whirl
  2. Shaft whirl
  3. Journal whirl
  4. Bearing whirl

(Ans: a)

 

16-Oil whirl in journal bearing can be prevented by

  1. Providing an obstacle to whirling fluid
  2. Providing stabilizing load to minimize whirl
  3. Both ‘a’ and ‘b’
  4. None of the above

(Ans: c)

 

17-In order to prevent oil whirl in journal bearing, there is a shallow relief cut in the center of the bearing over the ____ half of the bearing.

  1. Top
  2. Bottom
  3. Both ‘a’ and ‘b’
  4. None of the above

(Ans: c)

 

18-Which of the following design eliminate the oil whirl completely?

  1. Tilting pad
  2. Pressure dam
  3. Stabilizing force
  4. All of the above

  (Ans: a)