MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
For the given fluctuating fatigue load, the values of stress amplitude and stress ratio are respectively |
| A. | 100 MPa and 5 |
| B. | 250 MPa and 5 |
| C. | 100 MPa and 0.20 |
| D. | 250 MPa and 0.20 |
| Answer» D. 250 MPa and 0.20 | |
| 2. |
If Kf is the fatigue stress concentration factor and Kt is the theoretical stress concentration factor then, the notch sensitivity q is? |
| A. | (Kf + 1) / (Kt + 1) |
| B. | (Kf - 1) / (Kt - 1) |
| C. | (Kt - 1) / (Kf - 1) |
| D. | (Kf - 1) / (Kt + 1) |
| Answer» C. (Kt - 1) / (Kf - 1) | |
| 3. |
Coaxing is a process of |
| A. | Improving the fatigue properties, attained by under-stressing and then raising the stress in small increments |
| B. | Decreasing the hardness by full annealing |
| C. | Increasing the uniaxial tensile strength by heating above recrystallization temperature and quenching in oil media |
| D. | Maintaining the ductility of the material by chemical treatment |
| Answer» B. Decreasing the hardness by full annealing | |
| 4. |
Minimum center distance is to be maintained between two gears with respect to |
| A. | Yield strength of the material |
| B. | Ultimate strength of the material |
| C. | Fatigue strength of the material |
| D. | Compressive strength of the material |
| Answer» D. Compressive strength of the material | |
| 5. |
Endurance limit is of primary concern in the design of a/an1. rotating shaft2. industrial structure3. column4. machine baseWhich of the above is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» B. 2 only | |
| 6. |
Beach or clamshell marks on a failed metallic surface are typical of |
| A. | Ductile fracture |
| B. | Brittle fracture |
| C. | Creep failure |
| D. | Fatigue failure |
| Answer» E. | |
| 7. |
A steel connecting rod having Sut = 1000 MN/m2, Syt = 900 MN/m2 is subjected to a completely reversed axial load of 50 kN. By neglecting any column action, if the values of kc = 0.85, kb = 0.9, ka = 0.82, kt = 1.5, q = 0.6 and N = 2, the diameter of the rod will be nearly |
| A. | 20 mm |
| B. | 23 mm |
| C. | 26 mm |
| D. | 29 mm |
| Answer» C. 26 mm | |
| 8. |
For which one of the following loading conditions is the standard endurance strength multiplied by a load factor, Ke = 0.9? |
| A. | Reversed beam bending loads |
| B. | Reversed axial loads with no bending |
| C. | Reversed axial loads with intermediate bending |
| D. | Reversed torsion loads |
| Answer» C. Reversed axial loads with intermediate bending | |
| 9. |
Endurance limit is related to |
| A. | Fatigue |
| B. | Creep |
| C. | Impact |
| D. | Yielding |
| Answer» B. Creep | |
| 10. |
A static load is mounted at the center of a shaft rotating at uniform angular velocity. This shaft will be designed for |
| A. | The maximum compressive stress (static) |
| B. | The maximum tensile stress (static) |
| C. | The maximum bending moment (static) |
| D. | Fatigue loading |
| Answer» E. | |
| 11. |
A 120 mm wide uniform plate is to be subjected to a tensile load that has a maximum value of 250 kN and a minimum value of 100 kN. The properties of the plate material are : endurance limit stress is 225 MPa, yield point stress is 300 MPa. If the factor of safety based on yield point is 1.5, the thickness of the plate will be nearly |
| A. | 12 mm |
| B. | 14 mm |
| C. | 16 mm |
| D. | 18 mm |
| Answer» B. 14 mm | |