theory of structures MCQs – Page 7

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

theory of structures Mcqs

121. 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

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

A. 1.6

B. 1.7

C. 1.4

D. 1.5

123. 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____________________?
0

A. 2M/ T

B. T/M

C. M/T

D. 2T/M

124. Pick up the correct statement from the following ?
0

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

125. P=4EI/L 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

126. If a three hinged parabolic arch, (span l, rise h) is carrying a uniformly distributed load w/unit length over the entire span__________________?
0

A. Horizontal thrust is wl2/8h

B. B.M. will be zero throughout

C. All the above

D. S.F. will be zero throughout

127. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix_________________?
0

A. All the above

B. Its mean diameter will decrease

C. Its number of coils will increase

D. It is subjected to pure bending

128. 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_________________?
0

A. (IX IY)/2

B. (I /I )

C. (IX + IY)/2

D. IX + IY

129. 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______________?
0

A. 4WD3n/d4N

B. 4WDn/d4N

C. 4WD3n/d4N

D. 4WDn/d4N

130. 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

131. For permissible shear stress fs, the torque transmitted by a thin tube of mean diameter D and wall thickness t, is________________?
0

A. ( /2) t fs

B. ( /2) t fs

C. ( /4) fs

D. D2t fs

132. The degree of indeterminacy of the frame in the given figure, is______________?
0

A. 1

B. Zero

C. 3

D. 2

133. The ratio of crippling loads of a column having both the ends fixed to the column having both the ends hinged, is________________?
0

A. 1

B. 4

C. 2

D. 3

134. If the strain energy stored per unit volume in a hollow shaft subjected to a pure torque when t attains maximum shear stress fs the ratio of inner diameter to outer diameter, is 17/64 (f /N)s__________________?
0

A. 2-Jan

B. 5-Jan

C. 1/4

D. 3-Jan

135. A steel bar 5 m 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm2 and Poissons ratio is 0.25, the change in the volume of the bar is_________________?
0

A. 1.125 cm3

B. 2.125 cm3

C. 4.125 cm2

D. 3.125 cm3

136. For determining the support reactions at A and B of a three hinged arch, points B and Care joined and produced to intersect the load line at D and a line parallel to the load line through A at D. Distances AD, DD and AD when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is___________________?
0

A. 60

B. 30

C. 45

D. 90

137. Flat spiral springs_______________?
0

A. Are supported at outer end

B. Are wound by applying a torque

C. All the above

D. Consist of uniform thin strips

138. For a strongest rectangular beam cut from a circular log, the ratio of the width and depth, is________________?
0

A. 0.404

B. 0.707

C. 0.505

D. 0.303

139. At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by_________________?
0

A. Maximum tensile stress at the section

B. Maximum compressive stress at the section

C. Depth of the section

D. Depth of the neutral axis

140. Maximum principal stress theory for the failure of a material at elastic point, is known________________?
0

A. St. Venants theory

B. Rankines theory

C. Von Mises theory

D. Guests or Trecas theory

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