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71.

A body is subjected to two normal stresses 20 kN / m2 (tensile) and 10 kN / m2 (compressive) acting perpendicular to each other. The maximum shear stress is

A.	5 kN / m2	B.	10 kN / m2
C.	15 kN / m2	D.	20 kN / m2

72.

For biaxial stress, the planes of maximum shear are at right angles to each other and are inclined at 45? to the principal planes.

True

False

73.

The maximum shear stress is

A.	equal to	B.	one-fourth
C.	one-half	D.	twice

74.

Mohr's circle is used to determine the stresses on an oblique section of a body subjected to

A.	direct tensile strss in one plane accompanied by a shear stress	B.	direct tensile stress in two mutually perpendicular directions
C.	direct tensile stress in two mutually perpendicular directions accompanied by a simple shear stress	D.	all of the above

75.

The extremeties of any diameter on Mohr's circle represent

A.	principal stresses	B.	normal stresses on planes at 45?
C.	shear stresses on planes at 45?	D.	normal and shear stresses on a plane

76.

The maximum shear stress is equal to the radius of Mohr's circle.

Correct

Incorrect

77.

The energy stored in a body when strained within elastic limit is known as

A.	resilience	B.	proof resilience
C.	strain energy	D.	impact energy

78.

The total strain energy stored in a body is termed as

A.	resilience	B.	proof resilience
C.	impact energy	D.	modulus of resilience

79.

The proof resilience is the maximum strain energy which can be stored in a body

Yes

80.

The proof resilience per unit volume of a material is known as modulus of resilience.

True

False