civil engineering MCQs – Page 284

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs

5661. The horizontal deflection of a parabolic curved beam of span 10 m and rise 3 m when loaded with a uniformly distributed load l t per horizontal length is (where Ic is the M.I. at the crown, which varies as the slope of the arch)___________________?
0

A. 200/EIc

B. 150/EIc

C. 100/EIc

D. 50/EIc

5662. The forces acting normally on the cross section of a bar shown in the given figure introduce_______________?
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A. Compressive stress

B. None of these

C. Tensile stress

D. Shear stress

5663. The ratio of shear stress and shear strain of an elastic material, is________________?
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A. Modulus of Rigidity

B. Shear Modulus

C. Modulus of Elasticity

D. Both A. and B

5664. The forces in the members of simple trusses, may be analysed by________________?
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A. Method of joints

B. All the above

C. Method of sections

D. Graphical method

5665. In case of a simply supported rectangular beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is__________________?
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A. L/3

B. L/5

C. L/2

D. L/4

5666. The ratio of the stresses produced by a suddenly applied load and by a gradually applied load on a bar, is__________________?
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A. 1

B. 2-Jan

C. 4-Jan

D. 2

5667. Maximum shear stress theory for the failure of a material at the elastic limit, is known________________?
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A. Rankines theory

B. Haigs theory

C. Guests or Trecas theory

D. St. Venants theory

5668. The ratio of the length and depth of a simply supported rectangular beam which experiences maximum bending stress equal to tensile stress, due to same load at its mid span, is_______________?
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A. 3-Jan

B. 2-Jan

C. 2/3

D. 4-Jan

5669. A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be________________?
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A. 10 m

B. 12 m

C. 16 m

D. 14 m

5670. The horizontal thrust on the ends of a two hinged semicircular arch of radius carrying_________________?
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A. end, is

B. A uniforml 4/3

C. non of these

D. . All the above

5671. If a solid shaft (diameter 20 cm, length 400 cm, N = 0.8 105 N/mm2) when subjected to a twisting moment, produces maximum shear stress of 50 N/mm 2, the angle of twist in radians, is_________________?
0

A. 0.0025

B. 0.001

C. 0.003

D. 0.002

5672. In plastic analysis, the shape factor for rectangular section, is________________?
0

A. 1.6

B. 1.7

C. 1.4

D. 1.5

5673. A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is____________________?
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A. 2M/ T

B. T/M

C. M/T

D. 2T/M

5674. Pick up the correct statement from the following ?
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A. If tensile stress is equal to axial stress, the section experiences compressive stress

B. The moment of inertia is calculated about the axis about which bending takes place

C. If tensile stress is less than axial stress, the section experiences compressive stress

D. All the above

5675. P=4EI/L is the equation of Eulers crippling load if________________?
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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

5676. If a three hinged parabolic arch, (span l, rise h) is carrying a uniformly distributed load w/unit length over the entire span__________________?
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A. Horizontal thrust is wl2/8h

B. B.M. will be zero throughout

C. All the above

D. S.F. will be zero throughout

5677. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix_________________?
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A. All the above

B. Its mean diameter will decrease

C. Its number of coils will increase

D. It is subjected to pure bending

5678. If Ix and Iy are the moments of inertia of a section about X and Y axes, the polar moment of inertia of the section, is_________________?
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A. (IX IY)/2

B. (I /I )

C. (IX + IY)/2

D. IX + IY

5679. A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is______________?
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A. 4WD3n/d4N

B. 4WDn/d4N

C. 4WD3n/d4N

D. 4WDn/d4N

5680. P = / L is the equation for 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

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