Theory of Structures

121. In a shaft, the shear stress is not directly proportional to

1. Radius of the shaft
2. Angle of twist
3. Length of the shaft
4. Modulus of rigidity

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122. Shear strain energy theory for the failure of a material at elastic limit, is due to

1. Rankine
2. Guest or Trecas
3. St. Venant
4. Von Mises

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123. The tangential component of stress on an plane inclined θ° to the direction of the force, may be obtained by multiplying the normal stress by

1. sin θ
2. cos θ
3. tan θ
4. sin²θ

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124. The normal component of a force inclined thro

1. sin θ
2. cos θ
3. tan θ
4. sin θ. cos θ

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125. The ratio of tangential and normal components of a stress on an inclined plane through θ° to the direction of the force is:

1. sin θ
2. cos θ
3. tan θ
4. cos θ

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126. A composite beam is composed of two equal strips one of brass and other of steel. If the temperature is raised

1. Steel experiences tensile force
2. Brass experiences compressive force
3. Composite beam gets subjected to a couple
4. All the above

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127. The load on a spring per unit deflection, is called

1. Stiffness
2. Proof resilience
3. Proof stress
4. Proof load

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128. The strain energy stored in a spring when subjected to greatest load without being permanently distorted, is called

1. Stiffness
2. Proof resilience
3. Proof stress
4. Proof load

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129. The greatest load which a spring can carry without getting permanently distorted, is called

1. Stiffness
2. Proof resilience
3. Proof stress
4. Proof load

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130. The locus of the moment of inertia about inclined axes to the principal axis, is

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

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