57.

58.

59.

60.

61.

62.

099/23

State of plane stress at a point is given as : o, = Oy = 100 MPa and Ty = 0. The
radius of Mohr’s circle will be

A) 50 units B) 0 C) 100 units D) None

Acantilever beam of diameter D, length L, cross-section A is subjected to a uniformly
distributed load W and a concentrated load W, at a distance L, from free end will
have maximum bending moment of

WL 2
2) കടു ‏ص۷۰۵ گلا رع‎
2 2
: WiL-L,) , WL +L,)
9 ‏0ط‎ ஒட்டு dD)

Consider the following statements regarding point of contraflexure :
1. Shear force is zero at the point of contraflexure.

2. Bending moment is zero at the point of contraflexure.

3. Bending moment changes its sign at the point of contraflexure.
4. Shear force changes its sign at the point of contraflexure.
Which of the following statements is/are correct ?

A) 1 and 3 only B) 1 and 4 only

C) 2and3 only D) 2 and 4 only

In terms of theoretical stress concentration factor (k,) and the notch sensitivity ‘q’,
the fatigue stress concentration factor (k,), is expressed as

A) k,= 14 q (k, +1) 8) k,=1+q (k,- 1)
C) k, = a/(k, — 1) D) k, = (k, — 1)/q

The state of stress at a point is given as :
6, = 100 Nimm?, o, = 40 N/mm? and T,, = 40 N/mm?

If the yield strength S, of the material is 300 MPa, the factor of safety using maximum
shear stress theory will be

A) 3 B) 2.5 C) 7.5 D) 1.25

The S-N curve for steel becomes asymptotic nearly at
A) 10° cycles B) 10° cycles
C) 10° cycles D) 10° cycles

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