MCQOPTIONS
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MCQOPTIONS
This section includes 24 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. |
What is the S.I. unit of sectional modulus? |
| A. | mm |
| B. | mm |
| C. | mm |
| D. | m |
| Answer» B. mm | |
| 2. |
Force of 100 kN is applied on 900 mm long rod of 20 mm diameter and is simultaneously heated at 70 C. What is the total elongation of the rod? (Assume coefficient of thermal expansion = 10 x 10 C, Young's modulus = 150 Gpa) |
| A. | 2.54 mm |
| B. | 2.00 mm |
| C. | 1.27 mm |
| D. | 0.63 mm |
| Answer» B. 2.00 mm | |
| 3. |
Stress in the cross section of a shaft at the centre ________ |
| A. | is zero |
| B. | decreases linearly to the maximum value of at outer surface |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. decreases linearly to the maximum value of at outer surface | |
| 4. |
Stress on an object due to sudden load is _________ the stress induced when the load is applied gradually. |
| A. | equal to |
| B. | half |
| C. | twice |
| D. | thrice |
| Answer» D. thrice | |
| 5. |
What is the proof resilience of a square bar of 2500 mmand 200 mm long, when a load of 150 kN is induced gradually?(Take E = 150 x 10 Mpa) |
| A. | 45 J |
| B. | 8 J |
| C. | 5.3 J |
| D. | 6 J |
| Answer» E. | |
| 6. |
In the relation ( T/J = G /L = / R), the letter G denotes modulus of______ |
| A. | elasticity |
| B. | plasticity |
| C. | rigidity |
| D. | resilience |
| Answer» D. resilience | |
| 7. |
What is the shear stress acting on the outer surface of a hollow shaft subjected to a torque of 100 Nm?(The inner and outer diameter of the shaft is 15 mm and 30 mm respectively.) |
| A. | 50.26 N/mm |
| B. | 40.24 N/mm |
| C. | 20.120 N/mm |
| D. | 8.74 N/mm |
| Answer» D. 8.74 N/mm | |
| 8. |
In Euler's theory, long columns having the ratio of (L /LLD) 12 fail due to _______ |
| A. | crushing |
| B. | buckling |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 9. |
Euler's formula is applicable only _________1. for short columns2. for long columns3. if slenderness ratio is greater than ( E / ) 4. if crushing stress < buckling stress 5. if crushing stress buckling stress |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 5 |
| C. | 3 and 4 |
| D. | all of the above |
| Answer» C. 3 and 4 | |
| 10. |
Slenderness ratio is the ratio of effective length of column and ________ |
| A. | lateral dimension of a column |
| B. | least radius of gyration of a column |
| C. | maximum radius of gyration of a column |
| D. | none of the above |
| Answer» C. maximum radius of gyration of a column | |
| 11. |
What is the bulk modulus of a material, if a cube of 100 mm changes its volume to 4000 mm when subjected to compressive force of 2.5 x 10 N? |
| A. | 62.5 Gpa |
| B. | 65 Gpa |
| C. | 67.5 Gpa |
| D. | 70 Gpa |
| Answer» B. 65 Gpa | |
| 12. |
If a composite bar of copper and steel is heated at 120 C, the stress induced in copper bar is _______ |
| A. | compressive stress |
| B. | shear stress |
| C. | tensile stress |
| D. | thermal stress |
| Answer» B. shear stress | |
| 13. |
What is the value of thermal stress, if a rod of 3 m is heated at 50 C and is fixed at both the ends?(Take = 10 x 10 /C & E= 200 x 10 Mpa) |
| A. | 25 Mpa |
| B. | 50 Mpa |
| C. | 100 Mpa |
| D. | 150 Mpa |
| Answer» D. 150 Mpa | |
| 14. |
Which of the following laminas have same moment of inertia (I = I), when passed through the centroid along x-x and y-y axes? |
| A. | Circle |
| B. | Semi-circle |
| C. | Right angle triangle |
| D. | Isosceles triangle |
| Answer» B. Semi-circle | |
| 15. |
A simply supported beam carries uniformly distributed load of 20 kN/m over the length of 5 m. If flexural rigidity is 30000 kN.m, what is the maximum deflection in the beam? |
| A. | 5.4 mm |
| B. | 1.08 mm |
| C. | 6.2 mm |
| D. | 8.6 mm |
| Answer» B. 1.08 mm | |
| 16. |
Torque and bending moment of 100 kN.m and 200 kN.m acts on a shaft which has external diameter twice of internal diameter. What is the external diameter of the shaft which is subjected to a maximum shear stress of 90 N/mm? |
| A. | 116.5 mm |
| B. | 233.025 mm |
| C. | 587.1 mm |
| D. | 900 mm |
| Answer» D. 900 mm | |
| 17. |
While determining crippling load, the effective length of solid circular bar is 1/ 2 of actual length if, _______ |
| A. | both ends of solid circular bar are fixed |
| B. | both ends of solid circular bar are hinged |
| C. | one end is fixed and one is free |
| D. | one end is fixed and other end is hinged |
| Answer» E. | |
| 18. |
What is the safe load acting on a long column of 2 m having diameter of 40 mm. The column is fixed at both the ends and modulus of elasticity is 2 x 10 N/mm? (F.O.S = 2) |
| A. | 120 kN |
| B. | 124 kN |
| C. | 130 kN |
| D. | 150 kN |
| Answer» C. 130 kN | |
| 19. |
St. Ve t's theory is also known as maximum_________ |
| A. | principle stress theory |
| B. | shear stress theory |
| C. | principle strain theory |
| D. | strain energy theory |
| Answer» D. strain energy theory | |
| 20. |
When a component is subjected to axial stress the normal stress is maximum, if cos is _______ . ( = Cos )1. maximum2. minimum3. always one4. always zero |
| A. | 1 and 4 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 2 and 4 |
| Answer» C. 2 and 3 | |
| 21. |
Shear stress energy theory is called as ______ |
| A. | distortion theory |
| B. | Von Mises theory |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 22. |
The graphical method of Mohr's circle represents shear stress ( ) on ______ |
| A. | X-axis |
| B. | Y-axis |
| C. | Z-axis |
| D. | None of the above |
| Answer» C. Z-axis | |
| 23. |
The angle between normal stress and tangential stress is known as angle of______ |
| A. | declination |
| B. | orientation |
| C. | obliquity |
| D. | rotation |
| Answer» D. rotation | |
| 24. |
What is the value of shear stress acting on a plane of circular bar which is subjected to axial tensile load of 100 kN? (Diameter of bar = 40 mm , = 42.3) |
| A. | 58.73 Mpa |
| B. | 40.23 Mpa |
| C. | 39.60 Mpa |
| D. | Insufficient data |
| Answer» D. Insufficient data | |