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ESE ME 2018 Achiever Study Plan: Machine Design Quiz 1
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Question 1
Endurance limit is of primary concern in the design of a/an
1) rotating shaft
2) industrial structure
3) column
4) machine base
Which of the above is/are correct?
1) rotating shaft
2) industrial structure
3) column
4) machine base
Which of the above is/are correct?
Question 2
Consider the following statements:
For a component made of ductile material, the failure criterion will be
1) endurance limit, if the external force is fluctuating
2) fatigue, if the external force is fluctuating
3) yield stress, if the external force is static
Which of the above statements are correct?
For a component made of ductile material, the failure criterion will be
1) endurance limit, if the external force is fluctuating
2) fatigue, if the external force is fluctuating
3) yield stress, if the external force is static
Which of the above statements are correct?
Question 3
The S-N curve for steel becomes asymptotic nearly at
Question 4
For the given fluctuating fatigue load, the values of stress amplitude and stress ratio are respectively.
Question 5
A forged steel link with uniform diameter of 30 mm at the centre is subjected to an axial force that varies from 40 kN in compression to 160 kN in tension. The tensile (Su), yield (Sy) and corrected endurance (Se) strengths of the steel material are 600 MPa, 420 MPa and 240 MPa respectively. The factor of safety against fatigue endurance as per Soderberg’s criterion is
Question 6
Fatigue strength of a rod subjected to cyclic axial force is less than that of a rotating beam of the same dimensions subjected to steady lateral force. What is the reason?
Question 7
In a structural member under fatigue loading, the minimum and maximum stresses developed at the critical point are 50 MPa and 150 MPa, respectively. The endurance, yield, and the ultimate strengths of the material are 200 MPa, 300 MPa and 400 MPa, respectively. The factor of safety using modified Goodman criterion is
Question 8
The expression for the notch sensitivity factor q will be:
Question 9
A cylindrical shaft is subjected to an alternating stress of 100 MPa. Fatigue strength to sustain 1000 cycle is 490 MPa. If the corrected endurance strength is 70 MPa, estimated shaft life will be
Question 10
In terms of theoretical stress concentration factor (Kt) and fatigue stress concentration factor (Kf), the notch sensitivity ‘q’ is expressed as
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Aug 30ESE & GATE ME
