Explore topic-wise MCQs in Mechanical Engineering.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

If the size of a standard specimen for fatigue testing machine is increased the endurance limit for the material will

A. Have same value as that of standard specimen
B. Increases
C. Decreases
D. None of these
Answer» D. None of these
Discussion
2.

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

A. 3/2
B. 8/5
C. 12/7
D. 2
Answer» E.
Discussion
3.

A metal alloy machine component is subjected to fluctuating tensile stress from 100 N/mm2 to 200 N/mm2. The material has yield and endurance strength of 450 and 200 N/mm2. The material has yield and endurance strength of 450 and 200 N/mm2 respectively. Find the factor of safety of the machine component.

A. 5/6
B. 12/7
C. 1/3
D. 6/5
Answer» C. 1/3
Discussion
4.

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

A. 1071 cycles
B. 15000 cycles
C. 281914 cycles
D. 928643 cycles
Answer» D. 928643 cycles
Discussion
5.

A component is subjected to varying tensile stresses such that maximum stress = 50 MPa and minimum stress = 10 MPa. It is made of the material having yield stress = 300 MPa and endurance stress = 100 MPa. According to the Soderberg criteria, the factor of safety will be:

A. 2
B. 2.5
C. 3.33
D. 4
Answer» D. 4
Discussion
6.

A thin spherical pressure vessel of 200 mm diameter and 1 mm thickness is subjected to an internal pressure varying from 4 to 8 MPa. Assume that the yield, ultimate, and endurance strength of material are 600, 800 and 400 MPa respectively. The factor of safety as per Goodman’s relation is

A. 2.0
B. 1.6
C. 1.4
D. 1.2
Answer» C. 1.4
Discussion
7.

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

A. 1.26
B. 1.37
C. 1.45
D. 2.00
Answer» B. 1.37
Discussion