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441.

The ratio of the area of cross-section of a circular section and the area of its core is

A.	16	B.	12
C.	10	D.	8

442.

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

A.	length of the shaft	B.	modulus of rigidity
C.	radius of the shaft	D.	angle of twist.

443.

Beams composed of more than one material, regidly connected so as to behave as one piece are known as

A.	composite beams	B.	compound beams
C.	determinate beams	D.	inditerminate beams

444.

St, Venant's theory for failure of material is based on

A.	maximum shear stress	B.	maximum strain energy
C.	maximum tensile stress	D.	none of the above

445.

Which of the following theory is also known as maximum shear stress theory of the failure of a material at the elastic limit

A.	Haig's theory	B.	Von Mises theory
C.	Guests Tresca theory	D.	Rankines theory

446.

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

A.	Von Mises theory	B.	Haig's theory
C.	Guest's or Tresca's theory	D.	Rankines theory

447.

Total strain energy theory for the failure of a material at elastic limit is also known as

A.	Gust's or Treasca's theory	B.	Von mises theory
C.	Rankine's theory	D.	Haig's theory

448.

Shear strain energy theory of the failure of a material at elastic limit is due to

A.	Haig	B.	Rankine
C.	Von Mises	D.	St. Venant

449.

The plastic design of steel structures which is based on the statical method of plastic analysis is

A.	Safe	B.	Unsafe
C.	gegas no indication of safety	D.	independent of safety

450.

The plastic section modulus is

A.	the ratio of plastic moment capacity to the field stress	B.	the ratio of plastic moment capacity of a section to the yield moment
C.	the ratio of moment of inertia to radius of gyration	D.	area multiplied by the radius of gyration