155/2015

Maximum : 100 marks

Time : 1 hour and 15 minutes

The maximum twisting moment a shaft can resist, is the product of the permissible shear
stress and :
(A) Moment of inertia (B) Polar moment of inertia

(C) Polar modulus (D) Modulus of rigidly

A beam of length L is pinned at both ends and is subjected to a concentrated bending couple
of moment M at its centre. The maximum bending moment in the beam is :

(A) ML/2 மு M
( 115 1) 102

In plastic analysis, the shape factor for a triangular section, is :
(A) 15 (B) 1.34
(0) 2.34 (D) 25

A single rolling load 8 kN rolls along a girder of 15 m span. The absolute maximum bending
moment will be :

(A) 8kN-m ൯ 15kN-m

(0) 380kN-m (@) 60kN-m

A rectangular beam 250 mm wide, 310 mm effective depth has 3 bars of 12 mm diameter
HYSD grade Fe 415 steel bars. Concrete grade is M20. The ultimate moment of resistance of
the beam 18 :

(A) 35kN-m (B) 40kN-m

(©) 45kN-m (0) 55 kN-m

A cantilever steel beam of 3m span carries a udl of 10 kN/m inclusive of self weight. The
beam comprises of ISMB200@198N/m. Web thickness = 5.4 mm, I,, = 1696.6 cm‘ and

I, = 115 ८01, The maximum bending stress and average shear stresses in Mpa are

respectively :
(A) 66.3 and 55 (B) 265 and 27.78
(C) 390.8 and 54 (D) 132.5 and 27.78

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