Strength of Material (Part-5) (General Engineering) (SSC JE)

Total Questions: 21

1. What will be the deformation of the spring if a block of weight 100 N is kept on it . Take stiffness of spring 1000 N/m. [MPSC AE PRE.- 23.06.2019 ]

Correct Answer: (b) 0.1 m
Solution:

2. Which of the following is not a unit of Young’s modulus? [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (d) N/m
Solution:

3. Energy per unit volume in a stretched wire is [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (d) 1/2 stress × strain
Solution:

Work done on the wire is stored as energy in the material.

4. A simply supported beam and a cantilever have equal lengths. Both are subjected to same uniformly distributed load. Maximum bending stress in cantilever is (given EI are same) [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (b) more than simply supported
Solution:



5. Which section will be subjected to unsymmetrical bending? [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (a) Channel section
Solution:

When a structural member is subjected to transverse loading with that the bending of beam occurs in the principal plane of section, then the neutral axis of the section of beam is perpendicular to the plane of bending.

The neutral axis passes through the centroid of section, if the transverse loading is such that the bending of beam occurs in a plane other than the principle plane of section, the beam section is subjected to unsymmetrical bending channel section.

• The direction of neutral axis is not perpendicular toplane of bending. The maximum bending in a beam section subjects to unsymmetrical bending may be determined by following method–

(i) By revolving bending moment into two components
along the principal axes.
(ii) By revolving bending moment into two
components along any two perpendicular axes passing
through the centroid of the section.
(iii) By locating the neutral axis of section.

6. A cantilever is loaded with a concentrated load P at the free end. The shear force at the centre of the beam will be [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (a) P
Solution:

Then, in the cantilever beam loaded a concentrated load (P) at free end, the shear force at the centre of the beam will be P.

7. The phenomenon of decreased resistance of a material to repeated stresses is called [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (c) fatigue
Solution:

Properties of material–
(i) Fatigue–Fatigue is a failure phenomena of a material, it is caused by repeated application of cyclic stress to the metal fatigue is the progressive and localized structural damage.

(ii) Toughness–The ability of a material to absorb energy upto fracture is called as toughness.

(iii) Endurance limit–It is the maximum value of the completely reversed stress for which the specimen can sustain for an infinite number of cycles without any fatigue failure.

8. In case of column, critical or Euler’s buckling load at which buckled mode is possible is [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (b) least force
Solution:

Consider the ideal perfectly straight down with pinned supported at both end, the least force at which a buckle mode is possible is the critical or Euler buckling load.

9. Universal testing machine is used to determine [BPSC AE (GEN. ENGG.) 07.08.2019 ]

Correct Answer: (d) both tension and compression
Solution:

Universal testing machine–UTM machine is an essential tool for determining the mechanical properties of metals. UTM machine is used to determine tensile and compressive strength of metals in form of load and elongation.
• During testing in a UTM, the terms lower yield points and upper yield points shows in ductile material.
• Specimen dimension used in UTM–

10. The maximum shearing stress in a solid shaft of 200 mm diameter subjected to a torque of 5 × 10⁵ N-m is - [BPSC AE (GEN. ENGG.)-2001 ]

Correct Answer: (d) none of these
Solution: