2
Millwright Level 2 Bearings Exam questions with accurate || || || || || || || ||
solutions
What are the principle parts of a friction bearing housing?
|| || || || || || || || ||
Base, Base bolt slots, cap and cap bolt holes.
|| || || || || || || ||
What are friction bearing housings made from adn what factors influence the choice of
|| || || || || || || || || || || || || ||
housing?
Cast Iron, Cast Steel, Fabricated Steel.
|| || || || ||
Choice depends on the Load, The Rotational Speed, the Direction of Pull and the Support
|| || || || || || || || || || || || || || ||
Design
How are friction bearing dimensions expressed?
|| || || || ||
In a fraction of their nominal size.
|| || || || || ||
Do all new bearings of the same shaft size have the same base-to-eye measurement?
|| || || || || || || || || || || || ||
If they are from the same manufacturer.
|| || || || || ||
What factors influence the choice of bearings?
|| || || || || ||
Load, Rotational Speed, Direction of the Pull and support Design
|| || || || || || || || ||
What are the applications for the following bearings?
|| || || || || || ||
a)Solid Bearings ||
b)Split bearings ||
c)Angle bearings ||
d)Integrated Bearings ||
a) Where Speed and Load are low. Where load is applied on the top part of the bearing.
|| || || || || || || || || || || || || || || || ||
b) Where load is applied on the bottom portion of the bearing. Different bolt numbers for
|| || || || || || || || || || || || || || || ||
loads.
c)When load is applied parallel to, or at a slight angle to, the horizontal. Or when the
|| || || || || || || || || || || || || || || || ||
bearing is mounted on the vertical support || || || || || ||
d)Where the bearings are an integral part of the machine. || || || || || || || || ||
How does friction bearing joint design affect its integrity?
|| || || || || || || ||
Position of the top half may affect the bearing tolerances and load positions.
|| || || || || || || || || || || ||
, 2
What qualities should a good bearing material have? (5 points)
|| || || || || || || || ||
Softer than the shaft material, low coefficient of friction, wear-resistant, a good heat
|| || || || || || || || || || || || ||
conductor and remain relatively stable with heat changes, readily available.
|| || || || || || || || ||
List Metals generally used in bearing liners and their applications. (5 points)
|| || || || || || || || || || ||
Babbitt - for general use || || || ||
Brass (copper zinc alloy) - for higher speeds and heavier load than babbit
|| || || || || || || || || || || ||
Bronze (coper tin alloy) - for higher speeds and heavier loading than babbitt
|| || || || || || || || || || || ||
Aluminum - hydraulic pumps || || ||
Sintered Bronze - Porous bronze with a built in oil supply. 2:1 ratio.
|| || || || || || || || || || || ||
What characteristics of nylon polyurethanes and phenol laminates affect their applications?
|| || || || || || || || || ||
Heat, , water saturation.
|| || ||
What is the hardest and toughest babbitt made from?
|| || || || || || || ||
Tin (90%) ||
How does overheating affect babitt?
|| || || ||
Service life is greatly reduced || || || ||
How is babbitt held in bearing casting?
|| || || || || ||
Holes or slots. || ||
Describe the procedure for pouring a babbitt bearing using a mandrel. (6 Steps)
|| || || || || || || || || || || ||
1. Gather Equipment ( oxyacetylene torch putt pliers, babbitt)
|| || || || || || || ||
2. Fit the torch with a large tip and melt out the remaining babbitt in the casting
|| || || || || || || || || || || || || || || ||
3.Smoke the shaft with a straight acetylene flame. || || || || || || ||
4.Put a putty dam around the shaft and bearing
|| || || || || || || ||
5. Hold the babbitt with the pair of pliers
|| || || || || || || ||
6. Melt it into the bearing with the torch.
|| || || || || || || ||
What must be checked when fitting a bearing? (4 points)
|| || || || || || || || ||
surface finish area of contact, running clearance, lubrication entry, and grooves
|| || || || || || || || || ||
Describe the purpose of tinning. || || || ||
To secure a thin skin of babbitt to a metallic backing.
|| || || || || || || || || ||
Describe the tools used to fit a friction bearing. || || || || || || || ||
Millwright Level 2 Bearings Exam questions with accurate || || || || || || || ||
solutions
What are the principle parts of a friction bearing housing?
|| || || || || || || || ||
Base, Base bolt slots, cap and cap bolt holes.
|| || || || || || || ||
What are friction bearing housings made from adn what factors influence the choice of
|| || || || || || || || || || || || || ||
housing?
Cast Iron, Cast Steel, Fabricated Steel.
|| || || || ||
Choice depends on the Load, The Rotational Speed, the Direction of Pull and the Support
|| || || || || || || || || || || || || || ||
Design
How are friction bearing dimensions expressed?
|| || || || ||
In a fraction of their nominal size.
|| || || || || ||
Do all new bearings of the same shaft size have the same base-to-eye measurement?
|| || || || || || || || || || || || ||
If they are from the same manufacturer.
|| || || || || ||
What factors influence the choice of bearings?
|| || || || || ||
Load, Rotational Speed, Direction of the Pull and support Design
|| || || || || || || || ||
What are the applications for the following bearings?
|| || || || || || ||
a)Solid Bearings ||
b)Split bearings ||
c)Angle bearings ||
d)Integrated Bearings ||
a) Where Speed and Load are low. Where load is applied on the top part of the bearing.
|| || || || || || || || || || || || || || || || ||
b) Where load is applied on the bottom portion of the bearing. Different bolt numbers for
|| || || || || || || || || || || || || || || ||
loads.
c)When load is applied parallel to, or at a slight angle to, the horizontal. Or when the
|| || || || || || || || || || || || || || || || ||
bearing is mounted on the vertical support || || || || || ||
d)Where the bearings are an integral part of the machine. || || || || || || || || ||
How does friction bearing joint design affect its integrity?
|| || || || || || || ||
Position of the top half may affect the bearing tolerances and load positions.
|| || || || || || || || || || || ||
, 2
What qualities should a good bearing material have? (5 points)
|| || || || || || || || ||
Softer than the shaft material, low coefficient of friction, wear-resistant, a good heat
|| || || || || || || || || || || || ||
conductor and remain relatively stable with heat changes, readily available.
|| || || || || || || || ||
List Metals generally used in bearing liners and their applications. (5 points)
|| || || || || || || || || || ||
Babbitt - for general use || || || ||
Brass (copper zinc alloy) - for higher speeds and heavier load than babbit
|| || || || || || || || || || || ||
Bronze (coper tin alloy) - for higher speeds and heavier loading than babbitt
|| || || || || || || || || || || ||
Aluminum - hydraulic pumps || || ||
Sintered Bronze - Porous bronze with a built in oil supply. 2:1 ratio.
|| || || || || || || || || || || ||
What characteristics of nylon polyurethanes and phenol laminates affect their applications?
|| || || || || || || || || ||
Heat, , water saturation.
|| || ||
What is the hardest and toughest babbitt made from?
|| || || || || || || ||
Tin (90%) ||
How does overheating affect babitt?
|| || || ||
Service life is greatly reduced || || || ||
How is babbitt held in bearing casting?
|| || || || || ||
Holes or slots. || ||
Describe the procedure for pouring a babbitt bearing using a mandrel. (6 Steps)
|| || || || || || || || || || || ||
1. Gather Equipment ( oxyacetylene torch putt pliers, babbitt)
|| || || || || || || ||
2. Fit the torch with a large tip and melt out the remaining babbitt in the casting
|| || || || || || || || || || || || || || || ||
3.Smoke the shaft with a straight acetylene flame. || || || || || || ||
4.Put a putty dam around the shaft and bearing
|| || || || || || || ||
5. Hold the babbitt with the pair of pliers
|| || || || || || || ||
6. Melt it into the bearing with the torch.
|| || || || || || || ||
What must be checked when fitting a bearing? (4 points)
|| || || || || || || || ||
surface finish area of contact, running clearance, lubrication entry, and grooves
|| || || || || || || || || ||
Describe the purpose of tinning. || || || ||
To secure a thin skin of babbitt to a metallic backing.
|| || || || || || || || || ||
Describe the tools used to fit a friction bearing. || || || || || || || ||
