MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering (MCQ) questions and answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate diameter of shaft using maximum shear stress theory,when equivalent torque of 1000 x 10 N-mm acts on the shaft. 50 Mpa is the allowable shear stress for the shaft |
| A. | 100.9 mm |
| B. | 319.15 mm |
| C. | 46.70 mm |
| D. | Insufficient data |
| Answer» D. Insufficient data | |
| 2. |
Which type of key consists of two square tapered keys placed 90 apart? |
| A. | Tangent key |
| B. | Kennedy key |
| C. | Saddle key |
| D. | Woodruff key |
| Answer» C. Saddle key | |
| 3. |
Stress induced on contact area between cotter and socket collar is ______ |
| A. | Tensile stress |
| B. | Direct shear stress |
| C. | Crushing stress |
| D. | None of the above |
| Answer» D. None of the above | |
| 4. |
Which among the following statements is/are true?1. Fracture of bolts occurs due to uneven distribution of impact energy 2. Castle nut is a locking device3. Fine threads are stronger than coarse threads4. Coarse threads apply more resistance when loosened |
| A. | Statement 2 and Statement 3 |
| B. | Statement 1 and Statement 2 |
| C. | Statement 3 and Statement 4 |
| D. | All of the above |
| Answer» C. Statement 3 and Statement 4 | |
| 5. |
Which of the following conditions is true for repeated stress?1. = 02. = / 23. = 4. = 05. = 6. = / 2where = mean stress and = stress amplitude |
| A. | condition 2 and 3 |
| B. | condition 1, 3 and 5 |
| C. | condition 2, 4, and 6 |
| D. | condition 3,4, 5 and 6 |
| Answer» D. condition 3,4, 5 and 6 | |
| 6. |
Match the following Group 1 items with Group 2 items and select the correct option1. Size factor ----------------------------------------- A. K2. Load factor ---------------------------------------- B. K3. Temperature factor ------------------------------- C. K4. Reliability factor --------------------------------- D. K |
| A. | 1 B, 2 A, 3 D, 4 C |
| B. | 1 C, 2 A, 3 D, 4 B |
| C. | 1 D, 2 B, 3 A, 4 C |
| D. | 1 D, 2 C, 3 A, 4 B |
| Answer» C. 1 D, 2 B, 3 A, 4 C | |
| 7. |
A single start square threaded power screw supportsload of 30 kN which has outer diameter of 30 mm and a pitch of 8 mm. Maximum shear stress of 30 N/mm is induced in a screw body. Determine number of screw threads considering direct shear stress. |
| A. | 3 threads |
| B. | 2 threads |
| C. | 4 threads |
| D. | None of the above |
| Answer» B. 2 threads | |
| 8. |
Match the following Group 1 items (Preferred series) and Group 2 items ( Step ratios) and select the correct option1. R5 ------------------------------------------------ A. 1.122. R20 ----------------------------------------------- B. 1.263. R80 ----------------------------------------------- C. 1.584. R10 ----------------------------------------------- D. 1.03 |
| A. | 1 D, 2 C, 3 A, 4 B |
| B. | 1 B, 2 D, 3 C, 4 A |
| C. | 1 A, 2 C, 3 D, 4 B |
| D. | 1 C, 2 A, 3 D, 4 B |
| Answer» E. | |
| 9. |
Calculate diameter of shaft using maximum principle stress theory, when equivalent bending moment of 900 x 10 N-mm acts on the shaft when maximum tensile stress does not exceed 50 N/mm and equivalent torque of 700 N-m acts on it. |
| A. | 56.80 mm |
| B. | 52.24 mm |
| C. | 50 mm |
| D. | None of the above |
| Answer» B. 52.24 mm | |
| 10. |
Universal coupling is a type of____ |
| A. | Flexible coupling |
| B. | Rigid coupling |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Rigid coupling | |
| 11. |
Line joining S (yield strength of the material) on mean stress axis and S (endurance limit of the component) on stress amplitude axis is called as _____ |
| A. | Goodman line |
| B. | Soderberg line |
| C. | Gerber line |
| D. | None of the above |
| Answer» C. Gerber line | |
| 12. |
The formula ( E A) / ( L / K)is devised to determine buckling load bywhere E = modulus of elasticity, L = equivalent length, K = radius of gyration |
| A. | Rankine |
| B. | Euler |
| C. | J. B. Johnson |
| D. | None of the above |
| Answer» C. J. B. Johnson | |
| 13. |
Which formula is used if slenderness ratioL / K < X, where X = ( 2 E / S )? |
| A. | Euler's formula |
| B. | J. B. Johnson formula |
| C. | Rankine formula |
| D. | None of the above |
| Answer» C. Rankine formula | |
| 14. |
Calculate torque required to overcome thread friction if axial load of 8 kN acts on a power screw having double start square threads of 30 mm mean diameter. Friction angle and lead angle are 7 and 9 respectively |
| A. | 68.81 N-m |
| B. | 41.90 N-m |
| C. | 34.40 N-m |
| D. | Insufficient data |
| Answer» D. Insufficient data | |
| 15. |
In power screws, if friction angle is less than lead angle , then the screw undergoes _______ |
| A. | over hauling |
| B. | self locking |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. self locking | |
| 16. |
Calculate overall efficiency of power screw, if the torque applied by the operator is 150 x 10 to move a load of 30 kN through a distance of 10 mm |
| A. | 22.36 % |
| B. | 37.69 % |
| C. | 31.83 % |
| D. | 30.23 % |
| Answer» D. 30.23 % | |
| 17. |
Which of the following statements is/are true?1. In volute springs, number of active coils gradually decreases as load increases2. Stiffness of spring decreases as number of coils decreases in conical springs3. Torsion springs are generally spiral4. Helical torsion springs are used in automobile starters |
| A. | Statements 1 and 3 |
| B. | Statements 2, 3 and 4 |
| C. | Statements 1, 3 and 4 |
| D. | All of the above |
| Answer» D. All of the above | |
| 18. |
Which formula is used to calculate shear strength of butt weld? |
| A. | P = h l |
| B. | P = h l |
| C. | P = h |
| D. | None of the above |
| Answer» B. P = h l | |
| 19. |
The shear stress concentration factor (K) in mechanical springs is given as _____ |
| A. | (1 + 0.5 / C) |
| B. | 0.615 / C |
| C. | (1 + 0.615 / C) |
| D. | [(4C 1) / (4C + 1)] + [0.615 / C] |
| Answer» B. 0.615 / C | |
| 20. |
Solid length for helical compression springs having square and ground ends is given as _________. |
| A. | (n + 2)d |
| B. | (n + 3)d |
| C. | (n + 1)d |
| D. | None of the above |
| Answer» B. (n + 3)d | |
| 21. |
Which of the following statements is/are false?1. Under fatigue load, casted structures are stronger than welded structures2. Welding cannot produce complicated structures3. Welding can join dissimilar materials4. Rivetted joints produce light weight constructions as compared to welded joints |
| A. | Statement 1 and Statement 3 |
| B. | Statement 1, 2 and Statement 4 |
| C. | Statement 1, 2 and Statement 3 |
| D. | All the above statements are false |
| Answer» C. Statement 1, 2 and Statement 3 | |