Download Previous year Diploma Paper of Strength of Material SOM 4th Sem/5309/May 2017 Diploma Paper

Strength of Material SOM 4th Sem/5309/May 2017 Diploma Paper

SECTION-A

Q1. Do as directed. 10×1.5=15

a. Hoop stress in a thin cylindrical shell is ____________ b. Sudden load is ___________ the gradual load. c. The polar moment of area of a circular section of diameter d is __________. d. At the neutral axis, bending stress is ___________. e. For the same area of cross –section, ___________ is the most strongest of all section in bending. f. Euler’s buckling load is ______________. g. The torsional shear stress is __________ at the centre of shaft. h. The minimum load at which the column tends to buckle is called _______. i. The strength of a column depends upon the ________ and its end conditions. j. Close coil helical springs are used for __________ load only. State True / False: – k. Longitudinal stress in a thin cylindrical shell is double the circumferential stress. ( True / False) l. Bending stress is maximum at the outermost fibres. ( True / False) m. Torque in a shaft is produced due to a couple acting on it. ( True / False) n. A live load is one which varies continuously. ( True / False) o. While testing a ductile material in tension necking start at upper yield points. ( True / False

SECTION-B

Q2. Attempt any five questions. 5×6=30

i. Draw stress-strain curve for mild steel & explain in short. ii. Define strain energy, proof resilience & modules of resilience. iii. Classify beam with diagram & define point of contraflexure. iv. State the assumptions in the theory of simple bending. v. Classify columns & state factors on which strength of column depends. vi. State the function of springs & Name different types of springs.. vii. A solid shaft is to transmit a torque of 50K-N. If the shear stress is not exceed 56 N/mm2.Find the minimum diameter of the shaft. viii. Define moment of inertia, section modulus &radius of gyration.

SECTION-C

Q3. Attempt any three questions. 3×10=30

1. A rigid bar is suspended from two wires of equal lengths 1.75m.One wire is 1mm in diameter and made of steel, other wire of 2mm in diameter is made of brass. A load of 100 N is placed on the rigid bar such that the bar remains horizontal. If the horizontal distance between wires is 200mm, Determine i. Stresses developed in steel and brass wires. ii. Distance of the load from the steel wires. Take Es= 2×105 N/mm2 & Eb = 1×105 N/mm2 2. A cantilever 1.5 m long carries a u.d.l of 2kN/m over a length of 1.25 m from the free end. It also carries a point load of 3KN at a distance of 0.5 m from the free end. Draw the S.F &B.M diagrams for the given beam. 3. A closed coil helical springh whose spring index is 8, absorbs 50 N-m of energy when compressed for 50 mm. If the numbers of coil are 10, then calculate. i. Diameter of springs ii. Wire diameter N iii. Maximum shear stress induced Take G=84 GPa

Strength of Material SOM 4th Sem/5309
/May 2017 Diploma Paper

Moment of inertia, section modulus &radius of gyration.

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Strength of Material SOM 4th Sem/5309
/May 2017 Diploma Paper

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Rigid bar is suspended from two wires of equal lengths 1.75m.One wire is 1mm in diameter and made of steel, other wire of 2mm in diameter is made of brass. A load of 100 N is placed on the rigid bar such that the bar remains horizontal. If the horizontal distance between wires is 200mm, Determine i. Stresses developed in steel and brass wires.

Cantilever 1.5 m long carries a u.d.l of 2kN/m over a length of 1.25 m from the free end. It also carries a point load of 3KN at a distance of 0.5 m from the free end. Draw the S.F &B.M diagrams for the given beam.

Closed coil helical springh whose spring index is 8, absorbs 50 N-m of energy when compressed for 50 mm. If the numbers of coil are 10, then calculate. i. Diameter of springs ii. Wire diameter N iii. Maximum shear stress induced Take G=84 GPa

Laminated spring 600mm long is made up of plates each being 60mm wide and 8mm thick. Fing the number of plates required to enable the spring to carry a central point load of 4000N if the permissible bending stress is 120N/mm2. Also find deflection if E=200KN/mm2.

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