# Strength of material subject important questions/question bank for Mechanical/automobile engineering

#### Ranjith.ds

##### Moderator
Hi friends

Below you can find a list of important questions for the subject
Strength of material. These questions will give you a good idea of what to study and help you prepare well for your semester exams.

QUESTIONS:
VERY SHORT QUESTIONS (2 MARKS)
2. Define stress and give its unit
3. Thermal stress
4. Lateral strain
5. Poisson's ratio
6. Define elastic limit
7. Limit of proportionality
8. Hoop stress
9. Modulus of elasticity
10. Resilience
11. Proof resilience
13. Torsional resilience
15. Moment of inertia
16. Section modulus
17. Axis of symmetry
18. Centroidal axis
19. Moment of resistance
20. Pure bending
21. Modular ratio
22. Hooging bending moment
23. Sagging bending moment
24. Types of beam
26. U.D.L
27. Point of contraflexture
28. Column
29. Slenderness ratio
30. Equivalent length of the column
32. Long column
33. Torsion
34. Polar moment of inertia
35. Strength of a solid shaft
36. Torsional rigidity of a shaft
37. Neutral axis
38. Power transmitted by a shaft
39. Spring
40. Types of spring
41. Solid length of spring
42. Free length
43. Helical spring
44. Laminated spring
45. Spring index
46. Stiffness of spring
47. Helix angle
48. Volumetric strain
49. Bulk modulus
50. Modulus of rigidity

SHORT QUESTIONS (4 MARKS)
(1) A steel rod 8m long is heated from 10Â° C to 60Â°C. Find temperature stress & free expansion of the road.
(2) For lifting a load of 4KN with the help of a steel wire if stress not to exceed 80 Mpa , find safe diameter.
(3) Write a relation for the stress induced in a body due to shear resilience.
(4) Calculate the resilience and modulus of resilience of a bar 150mm long, 50 mm wide and 40 mm thick, subjected to a tensile load of 60 KN appied gradually. Take E= 2.1 Ã— 105 N/mm2
(5) Theorem of parallel axis
(6) Theorem of perpendicular axis
(7) A rectangular is of breadth 12.5 cm and depth 25 cm finds its section modulus.
(8) Explian M.O.I. of a hollow rectangular section.
(9) Explain various types of load
(10) Assumption made in the theory of simple bending
(11) How column are classified ? explain
(12) Assumption for circular shaft subjected to torsion
(13) Find a torque which a shaft of diameter 250 mm maximum shear stress exceed to 60 N/mm2
(14) A solid steel shaft 50 mm diameter & 700 mm long transmit 30 KW at 180 rpm. Find the maximum shear stress induced
(15) A cantilever 1 m long carries a UDL of 3KN/m2 of it length beyond 300mm from free end. Draw its S.F. and B.M diagram.
(16) What are the function of springs
(17) Explain the concept of mean & maximum torque in brief
(18) Define factor of safety
(19) Explian types of spring
(20) Explian deflection in a spring and give expression to calculate spring deflection.

LONG QUESTIONS (10 MARKS)
(1) A rod of 60mm diameter 8 m long is subjected to an axial pull of 120 KN . if E= 200 Gpa of the material of the rod then , determine stress, strain & elongation.
(2) A load of 50KN is suspended by a steel pipe 50 mm external diameter. If the ultimate tensile strength of steel is 500N/mm2 and FOS is 6. Find the pipe thickness.
(3) A bar 200 m long (32 mm Ã— 32 mm) section for 105 m of its length, 15 mm diameter. For 55 m length and 30 mm diameter for remaining length. If the tensile force of 60 KN is applied to the bar , calculate the stress induced in different section and total elongation. Take E= 2Ã—105 N/mm2.
46. Stiffness of spring
47. Helix angle
48. Volumetric strain
49. Bulk modulus
50. Modulus of rigidity

SHORT QUESTIONS (4 MARKS)
(1) A steel rod 8m long is heated from 10Â° C to 60Â°C. Find temperature stress & free expansion of the road.
(2) For lifting a load of 4KN with the help of a steel wire if stress not to exceed 80 Mpa , find safe diameter.
(3) Write a relation for the stress induced in a body due to shear resilience.
(4) Calculate the resilience and modulus of resilience of a bar 150mm long, 50 mm wide and 40 mm thick, subjected to a tensile load of 60 KN appied gradually. Take E= 2.1 Ã— 105 N/mm2
(5) Theorem of parallel axis
(6) Theorem of perpendicular axis
(7) A rectangular is of breadth 12.5 cm and depth 25 cm finds its section modulus.
(8) Explian M.O.I. of a hollow rectangular section.
(9) Explain various types of load
(10) Assumption made in the theory of simple bending
(11) How column are classified ? explain
(12) Assumption for circular shaft subjected to torsion
(13) Find a torque which a shaft of diameter 250 mm maximum shear stress exceed to 60 N/mm2
(14) A solid steel shaft 50 mm diameter & 700 mm long transmit 30 KW at 180 rpm. Find the maximum shear stress induced
(15) A cantilever 1 m long carries a UDL of 3KN/m2 of it length beyond 300mm from free end. Draw its S.F. and B.M diagram.
(16) What are the function of springs
(17) Explain the concept of mean & maximum torque in brief
(18) Define factor of safety
(19) Explian types of spring
(20) Explian deflection in a spring and give expression to calculate spring deflection.

LONG QUESTIONS (10 MARKS)
(1) A rod of 60mm diameter 8 m long is subjected to an axial pull of 120 KN . if E= 200 Gpa of the material of the rod then , determine stress, strain & elongation.
(2) A load of 50KN is suspended by a steel pipe 50 mm external diameter. If the ultimate tensile strength of steel is 500N/mm2 and FOS is 6. Find the pipe thickness.
(3) A bar 200 m long (32 mm Ã— 32 mm) section for 105 m of its length, 15 mm diameter. For 55 m length and 30 mm diameter for remaining length. If the tensile force of 60 KN is applied to the bar , calculate the stress induced in different section and total elongation. Take E= 2Ã—105 N/mm2.

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