THEORY OF STRUCTURES QUIZ

The area of the core of a column of cross sectional area A, is

(1/6) A

(1/3) A

(1/12) A

(1/18) A

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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

0.001

0.002

0.003

0.0025

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At yield point of a test piece, the material

Regains its original shape on removal of the load

Undergoes plastic deformation

Obeys Hooke’s law

Behaves in an elastic manner

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The vertical reaction for the arch is

wl/a

wa²/2l

wa/2l

wa/l

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The equivalent length is of a column of length having both the ends fixed, is

l

L/2

L

2 L

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The point of contraflexure is the point where

M. is minimum

S.F. is zero

M. changes sign

M. is maximum

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

Von Mises' theory

St. Venant's theory

Guest's or Trecas' theory

Rankine's theory

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A close coil helical spring when subjected to a moment M having its axis along the axis of the helix

It is subjected to pure bending

All of these

Its number of coils will increase

Its mean diameter will decrease

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The shape factor of standard rolled beam section varies from

1.30 to 1.40

1.40 to 1.50

1.10 to 1.20

1.20 to 1.30

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Flat spiral springs

All of these

Consist of uniform thin strips

Are wound by applying a torque

Consist of uniform thin strips

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