Theory of Structures

131. The locus of reaction of a two hinged semi-circular arch, is

  1. Straight line
  2. Parabola
  3. Circle
  4. Hyperbola

Correct answer: (A)
Straight line

132. For calculating the allowable stress of long columns σ0 = σy/n [1 - a (1/r)2]is the empirical formula, known as

  1. Straight line formula
  2. Parabolic formula
  3. Perry's formula
  4. Rankine's formula

Correct answer: (B)
Parabolic formula

133. For calculating the permissible stress σ0 σy /[(1 + a(l/r)2] is the empirical formula, known as

  1. Straight line formula
  2. Parabolic formula
  3. Perry's formula
  4. Rankine's formula

Correct answer: (D)
Rankine's formula

134. For calculating the allowable stress of long columns. The empirical formula √0 = (√y/n) (1 - a l/r), is known as

  1. Straight line formula
  2. Parabolic formula
  3. Perry's formula
  4. Rankine's formula

Correct answer: (A)
Straight line formula

135. A meterial which obeys Hook's law is subjeced to direct stress σ0. At its elastic limit, the following statement is true,

  1. Strain is equal to σ0/E
  2. Maximum shear stress = σ0/2
  3. Strain energy = σ02/2E × volume
  4. All the above

Correct answer: (D)
All the above

136. In case of principal axes of a section

  1. Sum of moment of inertia is zero
  2. Difference of moment inertia is zero
  3. Product of moment of inertia is zero
  4. None of these

Correct answer: (C)
Product of moment of inertia is zero

137. By applying the static equations i.e. ∑H = 0, ∑V = 0 and ∑M = 0, to a determinate structure, we may determine

  1. Supporting reactions only
  2. Shear forces only
  3. Bending moments only
  4. All the above

Correct answer: (D)
All the above

138. The yield moment of a cross section is defined as the moment that will just produce the yield stress in

  1. The outer most fibre of the section
  2. The inner most fibre of the section
  3. The neutral fibre of the section
  4. The fibre everywhere

Correct answer: (A)
The outer most fibre of the section

139. Pick up the correct statement from the following:

  1. The structural member subjected to compression and whose dimensions are small as compared to its length, is called a stmt
  2. The vertical compression members are generally known as columns or stanchions
  3. Deflection in lateral direction of a long column, is generally known as buckling
  4. All the above

Correct answer: (D)
All the above

140. A compound truss may be formed by connecting two simple rigid frames, by

  1. Two bars
  2. Three bars
  3. Three parallel bars
  4. Three bars intersecting at a point

Correct answer: (B)
Three bars

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