This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Bearings – 1”.
1. In journal bearings, what is the direction of the load on the shaft axis?
a) Axial
b) Perpendicular
c) 60° to the axis
d) 45° to the axis
View Answer
Explanation: We consider journal bearings when the load on the shaft is normal to the axis. These bearings come under sliding contact bearings, where the shaft and bearing has a sliding contact.
2. Solid journal bearing is used when the load is small and the wear is insignificant.
a) False
b) True
View Answer
Explanation: Solid journal bearings are simple in design. They consist of a cylindrical block, through which the shaft is passed, and a rectangular base made up of cast iron.
3. In bushed journal bearings, the material used to make the bush is ___________
a) Hard materials
b) High carbon steel
c) Heat treated steel
d) Soft materials
View Answer
Explanation: Bushes are introduced in the bearings to reduce the cost of maintenance. It can prevent relative axial and rotary motion. These are often made of soft materials like bronze, gunmetal.
4. Long shafts which need bearings for support but cannot be fit from the end. Then which of the following is used?
a) Solid journal bearings
b) Bushed journal bearings
c) Plummer block
d) Bracket bearings
View Answer
Explanation: Plummer block or pedestal bearing is used when a long shaft which cannot be introduced in the bearing end-wise. It is easy to maintain.
5. Transmission or line shafts that run near a wall or pillars, requires _________
a) Solid journal bearing
b) Bushed journal bearings
c) Bracket and hanger bearings
d) Footstep bearing
View Answer
Explanation: When shaft that runs parallel to a wall or pillar needs a shaft, bracket and hanger with bearings are often used. In bracket and hanger bearings, part of the bearing is the cast integral of the whole design.
6. Thrust bearings are suitable for the shafts where the subjected load on the shaft is ______
a) Axial
b) Perpendicular
c) 60° to the axis
d) 45° to the axis
View Answer
Explanation: When the load on the shaft is axial we use thrust bearings. These are rotary type bearings that support rotation between parts.
7. Find the type of bearing the following diagram is showing.
a) Footstep bearing
b) Pivot bearing
c) Single collar bearing
d) Multi-collar bearing
View Answer
Explanation: The diagram shows a collar bearing with 3 collars, hence it is called multi-collar bearing. These come under thrust bearings, which supports shafts under axial loads.
8. What is the bearing that is used to support vertical shafts, where one end of the shaft lies in the bearing?
a) Single-collar bearing
b) Pivot bearing
c) Multi-collar bearing
d) Hanger bearing
View Answer
Explanation: Pivot bearing or the footstep bearing comes under the family of the thrust bearing, which is used to support vertical shafts with axial loads, where one of the shafts ends rest in the bearing.
9. Which of the following do not belong to thrust bearings?
a) Pivot bearing
b) Hanger bearings
c) single collar bearing
d) multi-collar bearing
View Answer
Explanation: Thrust bearings are the class of bearings which support shafts with axial loads, they are classified as pivot and collar bear bearings. Hanger bearings are a type of journal bearings which support shafts running parallel to a ceiling or a beam.
10. If the manufacturer numbered the bearing as 5204Z then what is the bore size of the bearing?
a) 20mm
b) 80mm
c) 204mm
d) 4mm
View Answer
Explanation: The first digit indicates the type of bearing, 5 means thrust ball bearings. The second digit of the number indicates the series to which the bearing belongs to. Light series is indicated with 2, 3 and 4 are medium and heavy series respectively. The next two digits when multiplied by 5 gives the bore of the bearing or the size of the shaft, hence 20mm is the bore size for the bearing numbered 204. The last letters indicate sealing.
11. Which of the following does not come under anti-friction bearings?
a) Thrust ball bearing
b) Cylindrical roller bearing
c) Needle bearing
d) Pedestal bearing
View Answer
Explanation: When rolling friction contact exists between the shaft and the bearings, it is called as anti-friction bearings, as the rolling friction is negligible when compared to sliding friction. But Pedestal bearing which is also known as Plummer block has a sliding contact hence they are not anti-friction bearings.
12. Find the type of anti-friction bearing the diagram is representing.
a) Taper roller bearing
b) Needle bearing
c) Thrust ball bearing
d) Angular contact ball bearing
View Answer
Explanation: The given diagram represents cylinder with small diameter, these are called as needle bearings which are also called as quill bearings. They are compact and lightweight bearings
13. From the given bearing number find the bearing series it is representing.
6304Z
a) Light
b) Heavy
c) Medium
d) Extra light
View Answer
Explanation: In the bearing number the second digit indicates the bearing series. In the given number the second digit is 3, as per the series of bearing, 3 is the series code of medium series of bearings.
14. Find the bearing which does not come under sliding contact bearing?
a) Solid journal bearing
b) Plummer block
c) Needle bearings
d) Bracket bearings
View Answer
Explanation: Needle bearings are rolling contact bearings, they contain cylindrical roller with a very small diameter. Hence they do not comer under sliding contact bearing
15. Scoring and pitting causes failure of bearings by damaging the working surfaces.
a) True
b) False
View Answer
Explanation: Pitting and scoring causes damage to the working surface and thus results in failure of bearings. Pitting results in the formation of pits due to excessive load which is more than the surface endurance strength. Scoring is due to excessive pressure and speed, even inappropriate lubrication.
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