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31.

A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will                        


A. increase definitely B. decrease definitely
C. be difficult to predict D. increase or decrease depending upon the radius of the segmental arch




32.

According to Eddy's theorem, the vertical intercept between the linear arch and the centre line of actual arch at any point represents to some scale                        


A. bending moment B. shear force
C. normal thrust D. deflection




33.

According to Rankine's hypothesis, the criterion of failure of a brittle material is                        


A. maximum principal stress B. maximum shear stress
C. maximum strain energy D. maximum shear strain energy




34.

According to Unwin's formula, the diaŽmeter of rivet in mm to suit the t mm thickness of plate is given by                        


A. 6t B. 6Vt
C. 1.9-y/t D. 1.5 t+ 4




35.

At a point in a steel member, the major principal stress is 2000 kg/cm2 and the minor principal stress is compressive. If the uni-axial tensile yield stress is 2500 kg/cm2, then the magnitude of the minor principal stress at which yielding will commence, according to the maximum shearing stress theory, is                        


A. 1000 kg/cm2 B. 2000 kg/cm2
C. 2500 kg/cm2 D. 500 kg/cm2




36.

At a point in a strained body carrying two unequal unlike principal stresses pi and p2 (Pi > P2X the maximum shear stress is given by                        


A. p,/2 B. p2/2
C. (p,-p2)/2 D. (p, + p2)/2




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