theory of structures MCQs – Page 3

Practise focused theory of structures questions with marked answers for exam preparation and subject revision.

theory of structures Mcqs

41. For determining the force in the member AB of the truss shown in the given figure by method of sections, the section is made to pass through AB, AD and ED and the moments are taken about___________________?
0

A. Joint B

B. Joint C

C. Joint A

D. Joint D

42. The maximum deflection due to a uniformly distributed load w/unit length over entire span of a cantilever of length l and of flexural rigidly EI, is_________________?
0

A. wl3/3EI

B. wl4/12EI

C. wl4/8EI

D. wl4/3EI

43. A two hinged parabolic arch of span l and rise h carries a load varying from zero at the left end to________________?
0

A. /8h

B. /4h thrust is

C. /12h

D. /16h

44. A square column carries a load P at the centroid of one of the quarters of the square. If a is the side of the main square, the combined bending stress will be________________?
0

A. p/a

B. 3p/a

C. 2p/a

D. 4p/a

45. The shape factor of standard rolled beam section varies from_______________?
0

A. 1.30 to 1.40

B. 1.20 to 1.30

C. 1.40 to 1.50

D. 1.10 to 1.20

46. There are two hinged semicircular arches A, B and C of radii 5 m, 7.5 m and 10 m respectively and each carries a concentrated load W at their crowns. The horizontal thrust at their supports will be in the ratio of_______________?
0

A. 2 : 1 : 1

B. None of these

C. 1 : 1 : 2

D. 1 : 1 : 2

47. For calculating the permissible stress 0 y /[(1 + a(l/r)] is the empirical formula, known as__________________?
0

A. Parabolic formula

B. Rankines formula

C. Perrys formula

D. Straight line formula

48. A steel bar 20 mm in diameter simply-supported at its ends over a total span of 40 cm carries a load at its centre. If the maximum stress induced in the bar is limited to N/mm2, the bending strain energy stored in the bar, is___________________?
0

A. 711 N mm

B. 411 N mm

C. 611 N mm

D. 511 N mm=

49. The moment of inertia of a circular section about any diameter D, is______________?
0

A. 4/64

B. /64

C. Mar-64

D. Apr-32

50. For the close coil helical spring of the maximum deflection is__________________?
0

A. WD3n/d4N

B. 8WD3n/d4N

C. 2WD3n/d4N

D. 4WD3n/d4N

51. A cantilever of length is subjected to a bending moment at its free end. If EI is the flexural rigidity of the section, the deflection of the free end, is_________________?
0

A. ML/3EI

B. ML/EI

C. ML/2EI

D. ML/2EI

52. H V are the algebraic sums of the forces resolved horizontally and vertically respectively, M is the algebraic sum of the moments of forces about any point, for the equilibrium of the body acted upon____________________?
0

A. H = 0

B. All the above

C. V = 0

D. M = 0

53. Stress may be expressed in Newtons___________________?
0

A. Per metre square (N/m2)

B. None of these

C. Per millimetre square (N/mm2)

D. Per centimetre square (N/cm2)

54. In plastic analysis, the shape factor for a triangular section, is_________________?
0

A. 1.34

B. 2.5

C. 1.5

D. 2.34

55. A steel plate d b is sandwiched rigidly between two timber joists each D B/2 in section. The steel will be (where Youngs modulus of steel is m times that of the timber)_________________?
0

A. BD + mbd)/6D]

B. BD + mbd)/4D]

C. BD3 + mbd3)/6D]

D. BD + mbd3)/4D]

56. P = /4L is the equation of Eulers crippling load, if__________________?
0

A. Both the ends are fixed

B. Both the ends are hinged

C. One end is fixed and other end is free

D. One end is fixed and other end is hinged

57. In the cable shown in the given figure, the minimum tension occurs at___________________?
0

A. Between A and C

B. C

C. A

D. B

58. y/n) (1 a l/r), is For calculating the allowable stress of long columns. The empirical formula 0 known as_________________?
0

A. Straight line formula

B. Perrys formula

C. Rankines formula

D. Parabolic formula

59. In case of a simply supported I-section beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is_________________?
0

A. L/5

B. L/3

C. L/2

D. L/4

60. A compound bar consists of two bars of equal length. Steel bar cross -section is 3500 mm2and that of brass bar is 3000 mm2. These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm2 and Eb = 0.1 MN/mm2, the stresses developed are___________________?
0

A. b = 6 N/mm2 s = 12 N/mm2

B. b = 8 N/mm2 s = 16 N/mm2

C. b = 5 N/mm2 s = 10 N/mm2

D. b = 10 N/mm2 s = 20 N/mm 2

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