B

B3B071 Total Pages:3
a) Find the fixing torques set up at the ends of the shaft. (4)
b) If the shaft is of 50 mm diameter, find the maximum shear stresses in the two
portions. (4)
c) Find the angle of twist for the section where the torque is applied. (2)

Take © = 10° N/mm”.

PART B
Answer any three questions

Draw SFD and BMD for the overhanging beam shown in Fig. 2. Locate the points of

contraflexure. Also determine the maximum bending moment. (10)
10kN
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2m 3m 4m 2m 2m
பபப பபப பபப 9H 70d»
Fig. 2

a) Derive the relation between intensity of loading, shear force and bending moment at a

section of a uniformly loaded beam. (4)

b) A simply supported beam of length 4m carries a uniformly distributed load of 3kKN/m
over the central 2m length and two point loads 2101 and 3kN at distances 0.5m and 3.5m
from the left support. Draw SFD and BMD. Locate the point of maximum bending

moment and find out the maximum bending moment. (6)
a) What is pure bending? Explain with example. (4)

b) A wooden beam 3m long is simply supported at its ends and has a cross section
200mm x 400mm. It carries a uniformly distributed load of 40kN/m over the entire
span. Calculate the bending stress at a point 100mm above the bottom and 1൬൩ from the

left support. (6)
a) Explain how beams of uniform section can be designed in practice (4)

b) At the critical section of a I-beam, the value of vertical shear force is 40kN and the
sectional dimensions are:- Flange width — 200mm, flange thickness - 30mm, web
thickness - 40 mm and total depth - 300mm. Draw the shear stress distribution across

the depth of the section. (6)

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