Bissoy.com
Doctors Medicines MCQs Q&A

Consider the following statements regarding stress in beam : 1. If a member is subjected to equal and opposite couples acting in the same longitudinal planes, the member is said to be in pure bending. 2. The internal stresses developed in the beam are known as flexural stresses. 3. There is an intermediate surface known as neutral surface, at which the stress is zero. 4. An axis obtained by intersection of the neutral surface and a cross-section is known as neutral axis. Which of the above statements are correct ? 

Consider the following statements regarding stress in beam : 1. If a member is subjected to equal and opposite couples acting in the same longitudinal planes, the member is said to be in pure bending. 2. The internal stresses developed in the beam are known as flexural stresses. 3. There is an intermediate surface known as neutral surface, at which the stress is zero. 4. An axis obtained by intersection of the neutral surface and a cross-section is known as neutral axis. Which of the above statements are correct ?  Correct Answer 1, 2, 3 and 4

Explanation:

Pure Bending:

It is a case where a member is subjected to equal and opposite couples acting in the same longitudinal plane.

Flexural stresses:

Flexural stress is nothing but the stresses developed in the beam due to various loadings.

Neutral surface:

It is an imaginary surface inside the beam where the stresses are zero.

Neutral axis:

The neutral axis is an axis in the cross-section of a beam (a member resisting bending) or shaft along which there are no longitudinal stresses or strains. If the section is symmetric, isotropic and is not curved before a bend occurs, then the neutral axis is at the geometric centroid. All fibers on one side of the neutral axis are in a state of tension, while those on the opposite side are in compression.

Bending Stress distribution for symmetric I section

[ alt="F1 S.S M.P 25.07.19 D 7" src="https://storage.googleapis.com/tb-img/production/19/07/F1_S.S_M.P_25.07.19_D%207.PNG">

Related Questions

In which of the following cases, there exists the situation of Pure Bending in some part of the beam or along the entire beam? i) A simply supported beam subjected to two equally spaced downward concentrated loads ii) A simply supported beam subjected to two equally spaced opposite moments iii) A cantilever beam subjected to clockwise moment at free end iv) An overhanging beam with both side overhangs subjected to different concentrated loads at both the free ends
The question given below consists of a statement, followed by three arguments numbered I, II and III. You have to decide which of the arguments is/are ‘strong’ arguments and which is/are ‘weak’ arguments and accordingly choose your answer from the alternatives given below each question. Statement: As part of an effort to address the rising cases of divorces in the country, China's Jiangsu province has introduced a voluntary 'divorce test' for couples planning to end their marriage. Couples who score above 60 may be able to save their marriage, the civil affairs bureau said. Around 34 lakh Chinese couples filed for divorce in 2017. Is this sort of a decision/ test legitimate? Arguments: I. Yes, it is a valid decision and will give couples a chance to save their relationship. II. No, if a couple has decided to end their relationship, such a test won’t be beneficial. III. Yes, there is no harm in giving the test, if they want to separate their ways they can. But there might be a ray of hope that they decide to rethink their decision.
Consider the following statements regarding types of supports and beams: 1. When both supports of beams are roller supports, the beam is known as simply supported beam. 2. A beam with one end fixed and the other end free is known as fixed beam. 3. A beam with both ends fixed is known as cantilever beam. 4. A beam with one end fixed and the other simply supported is known as propped cantilever. Which of the above statements is/are correct ?
The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called
Consider the following statements: The basic reason why shafts are made of steel and its alloys is: 1. The shaft is subjected to normal stress. 2. The shaft stress alternates with respect to time. 3. The shaft is subjected to pure compressive stress. 4. The shaft is subjected to the stress of constant intensity. Which of these statements are correct?
If a body is subjected to stresses in xy plane with stresses of 60N/mm² and 80N/mm² acting along x and y axes respectively. Also the shear stress acting is 20N/mm²Find the maximum amount of shear stress to which the body is subjected.
Consider the following statements with regards to the shear force diagram for the beam ABCD: 1. The beam ABCD is an overhanging beam having supports at A and D only. 2. The beam carries a point load of 20 kN at C. 3. The beam carries a concentrated load of 10 kN at the end B. 4. The beam is an overhanging beam having supports at C and D only. 5. The beam carries a uniformly distributed load of 70 kN over the left hand portion AC only. Which of the above statements are correct?
Consider two shafts connected with two gears as per the following options: 1. One on each shaft 2. Through an intermediate gear mounted on an intermediate shaft, and every shaft having one gear only 3. Through an intermediate gear mounted on an intermediate shaft, with the intermediate shaft having two gears, whereas the other shafts have one gear each Which of the above represent(s) a simple gear train?
Consider the following statements; 1) In a reinforced concrete member subjected to flexure, the externally applied moment is resisted by an internal couple formed by steel and concrete and their magnitudes vary with the applied moment, while the lever arm of the internal couple remains constant 2) In a prestressed concrete. Member, the external moment is resisted by an internal couple, but it is the lever arm that changes with the loading conditions and the stress in steel remain practically constant Which of the above statements is/are correct?
Consider the following statements for a thick-walled cylinder, subjected to an internal pressure: 1. Hoop stress is maximum at the inside radius. 2. Hoop stress is zero at the outside radius. 3. Shear stress is maximum at the inside radius. 4. Radial stress is uniform throughout the thickness of the wall. Which of the above statements are correct?