This set of Structural Analysis Multiple Choice Questions & Answers (MCQs) focuses on “Shear and Moment Diagrams for a Frame-1”.

1. Direction of shear force will always be towards x axis in this frame.

a) True

b) False

View Answer

Explanation: Direction of shear force is always perpendicular to that of beam. In this frame, orientation of beams is different and so will be that of shear forces.

2. What will be the value of shear force at point A in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) 100

b) 110

c) 120

d) 130

View Answer

Explanation: On balancing force in the x direction, we will find that since support C can’t exert any force in x direction, shear force at A will be 120 KN.

3. What will be the shape of SFD of beam AB in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) Triangular

b) Rectangular

c) Trapezoid

d) Arbitrary curve

View Answer

Explanation: Since the loading is uniform and parallel to beam AB and point B has no shear, SFD will be of triangular shape.

4. How many points of discontinuities will be there in the SFD of beam BC in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) 0

b) 1

c) 2

d) 3

View Answer

Explanation: Since there is no discreet loading on the beam BC so, there won’t be any points of discontinuities in beam BC.

5. What will be the shape of SFD of beam BC in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) Triangular

b) Rectangular

c) Trapezoid

d) Arbitrary curve

View Answer

Explanation: There is no point of discontinuity, so the curve will basically two end values. Since both comes out to be same in this case, shape will e rectangular.

6. What will be the shape of BMD of beam AB in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) Triangular

b) Rectangular

c) Trapezoid

d) Arbitrary curve

View Answer

Explanation: Since the shape of the SFD of beam AB is triangular, integrating it will yield a curve for the BMD.

7. What will be the slope of BMD of beam AB at point B in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) 0

b) 15

c) 30

d) 45

View Answer

Explanation: The value of shear at point B is 0 for beam AB, so the slope of the BMD will be zero at that point.

8. What will be the shape of BMD of beam BC in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) Triangular

b) Rectangular

c) Trapezoid

d) Arbitrary curve

View Answer

Explanation: The BMD will be of triangular shape, as the SFD is rectangular and one end of the BMD comes out to be zero.

9. At what point would the slope of BMD of beam AB be 0 in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) A

b) B

c) In between

d) Never

View Answer

Explanation: The slope of the BMD of beam AB will be zero at point B, as the shear force at point B is zero.

10. At what point would the slope of BMD of beam BC be 0 in the given frame, where point A has a pin support, point B is a fixed end, and point C has a roller-type support, with AB = 4m and BC = 8m?

a) A

b) B

c) In between

d) Never

View Answer

Explanation: Shear force never becomes zero in the beam BC.

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