THEORY OF STRUCTURES QUIZ

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

4W²D3n²/d4N

4WD²n/d4N

4W²Dn/d4N

4W²D3n/d4N

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Flat spiral springs

Consist of uniform thin strips

Are wound by applying a torque

All of these

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Maximum principal stress theory for the failure of a material at elastic point, is known

Guest's or Trecas' theory

Rankine's theory

St. Venant's theory

Von Mises' theory

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The assumption in the theory of bending of beams is:

All of these

Young’s modulus is same in tension as well as in compression

Material is isotropic

Material is homogeneous

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Stress may be expressed in Newtons

Per millimetre square (N/mm²)

Per centimetre square (N/cm²)

Per metre square (N/m2)

None of these

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For the close coil helical spring of the maximum deflection is

WD3n/d4N

8WD3n/d4N

2WD3n/d4N

4W²D3n/d4N

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Maximum strain theory for the failure of a material at the elastic limit, is known as

Rankine's theory

Haig's theory

Guest's or Trecas' theory

St. Venant's theory

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Slenderness ratio of a long column, is

Area of cross-section divided by radius of gyration

Radius of gyration divided by area of cross-section

Area of cross-section divided by least radius of gyration

Length of column divided by least radius of gyration

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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

None of these

2 : 1½ : 1

1 : 1 : 2

1 : 1½ : 2

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The stiffness of the close coil helical spring is

4D3N/d4n

d4N/8D3n

d4N/4D3n

8D3N/d4n

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