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# Design Against Fluctuating Load - 1

## 10 Questions MCQ Test Machine Design | Design Against Fluctuating Load - 1

Description
This mock test of Design Against Fluctuating Load - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 10 Multiple Choice Questions for Mechanical Engineering Design Against Fluctuating Load - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Design Against Fluctuating Load - 1 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Design Against Fluctuating Load - 1 exercise for a better result in the exam. You can find other Design Against Fluctuating Load - 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

### Identify the  WRONG statement about fatigue:

Solution:

Resistance to fatigue of a material is measured by endurance strength.

QUESTION: 3

### Which of the following process is not adopted for incresaing the fatigue strength of a material?

Solution:
QUESTION: 4

The endurance limit, i.e. resistance to fatigue of a machine element can be improved by

Solution:
QUESTION: 5

Which of the following is not exactly a property of material?

Solution:

The endurance limit, in a true sense, is not exactly a property of material like ultimate tensile strength. It is affected by factors such as the size of the component, shape of the component, the surface finish, temperature and notch sensitivity of the material.

QUESTION: 6

The S-N curve is the graphical representation of stress amplitude versus the number of stress cycles before the fatigue failure on a

Solution:

QUESTION: 7

Consider following statements about low cycle and high cycle fatigue:
1. Low cycle fatigue corresponds to stress cycle less than 1000.
2. High cycle fatigue corresponds to stress cycle more than 10000.
3. The machine components such as springs, ball bearings, gears etc. are subjected to high cycle fatigue.
4. A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect.

Which of the above statements are valid?

Solution:

Low cycle fatigue: stress cycles < 103

High cycle fatigue: stress cycles > 103

Example of low cycle fatigue: studs on truck wheels, failure of set screws for locating gears on shafts, short-lived device such as missile Example of high cycle fatigue: springs, gears, ball bearings

QUESTION: 8

Increase of actual stress over nominal stress due to stress raising notches in fatigue loading is given by

Solution:

Nominal stress = kfσ0

Actual stress due to notch = kfσ0

∴ Increase in actual stress = (kf-1)σ0 ,

Theoretical stress due to notch = ktσ0 ,

∴ Increase in theoretical stress = (kt-1)σ0

QUESTION: 9

Which of the following approximate relationship between the endurance limit and the ultimate tensile strength of the material based on 50% reliability is not correctly matched?

Solution:

QUESTION: 10

Stress concentration in a machine components results'from:
1. abrupt changes in the cross-section of the component.
2. pressure at points/areas of the component at which the load is applied.
3. point-to-point variation in the properties of the material of the component.

Which of the above statements are valid?

Solution: