Surface plate is an example of marking tool.
Design Against Fluctuating Loads
Machine elements are subjected to varieties of loads, some components are subjected to static loads, while some machine components are subjected to fluctuating loads, whose load magnitude tends to fluctuate. The components of a machine, when rotating at a high speed, are subjected to a high degree of load, which fluctuates from a high value to a low value. For the machine elements under the action of static loads, static failure theories are applied to know the safe and hazardous working conditions and regions. However, most of the machine elements are subjected to variable or fluctuating stresses, due to the nature of load that fluctuates from high magnitude to low magnitude. Also, the nature of the loads is repetitive. For instance, shafts, bearings, cams and followers, and so on.
Design Against Fluctuating Load
Stress is defined as force per unit area. When there is localization of huge stresses in mechanical components, due to irregularities present in components and sudden changes in cross-section is known as stress concentration. For example, groves, keyways, screw threads, oil holes, splines etc. are irregularities.
![A14
Surface plate is an example of marking tool.
() True
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Encircle the correct Answer
Pounds per minute is the unit of
[b] Axial stiffness
[d] Horse power
A15
[a] Angular stiffness
[c] Radial stiffness
The most common type of rolling contact bearing is
[a] Ball thrust bearing
[c] Ball bearing
A16
[b] Roller thrust bearing
[d] Roller bearing
In horizontal alignment of shaft using DTI method, the measuring units are moved from
_O'clock to
O'clock position.
A17
[b] 3,6
[d] 9,3
[a] 3, 9
[c] 6,3
Which of the following lubrication method make use of siphon action to lubricate the bearing?
[a] Grease packing
[c] Wick
A18
[b] Circulating
[d] Bath
Tool used to cut internal thread is
[a] Die
[c] Taps
[)] Тар wrench
[d] Die wrench
A19
Which of the following is not a part of milling machine?
A20
[a] Saddle
[b] Column
[c] Table
[d] Ram](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1795d4ba-3b5d-4d11-8ae9-ab45143d94a3%2Ff26f7d1d-1dab-4978-b3d4-3eed21fb2686%2Faf9wm2_processed.jpeg&w=3840&q=75)
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