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Strength of Material Important Questions

UNIT - 1 SIMPLE STRESSES & STRAIN 1.A load of 5 KN is to be raised with the help of a steel wire. Find the diameter of steel wire, if the maximum stress is not to exceed 100 MN/m2.[ 7.28 mm] 2.A circular rod of diameter 20 m and 500 m long is subjected to tensile force of 45kN. The modulus of elasticity for steel may be taken as 200 KN/m2. Find stress, strain and elongation of bar due to applied load.[ 143.24 N/m2, 0.000716, 0.36] 3.Find the minimum diameter of the steel wire, which is used to raise a load of 4000N if the stress in the rod is not to exceed 95 MN/m2 . [d=7.32 mm] 4. Find the young modulus of a brass rod of diameter 25mm and of length 250mm which is subjected to a tensile load of 50kN when the extension of the rod is equal to 0.3mm. [E = 84.88 X 109N/m2] 5.A hollow cast-iron cylinder 4 m long, 300 mm outer diameter, and thickness of metal 50 mm is subjected to a central load on the top when standing straight. The stress produced is 75000 kN/m2. Assume Young's modulus …

Question on Machine Design (8 Sem)

UNIT – I Q.1) List & discuss briefly the factors that control the power transmission capacity of a belt. Q.2) Discuss various important parameters necessary for the selection of a particular drive for power transmission. Q.3) Under what circumstances a fiber rope & a wire rope is used ? What are the advantages of a wire rope over fiber rope ? Q.4) What do you understand by simple duplex & triplex chains ? Q.5) Write the design procedure for a chain drive.

UNIT – II Q.1) State the two most important reasons for adopting involute wire for a gear tooth profile. Q.2) How the shaft and arms for spur gear are designed? Q.3) What condition must be satisfied in order that a pair of spur gear may have a constant V.R.? Q.4) Define formative or virtual number of teeth on a helical gear. Q.5) What are the various forces acting on a bevel gear?
UNIT – III Q.1) Explain the various types of cylinder liners. Q.2) Explain the various stresses induced in the connecting rod. Q.3) Why the area of…


1.Define turbo machines and explain the different types of turbo machines.     2.“The energy transfer as work per unit mass flow numerically equal to change in stagnation enthalpy of the fluid between the turbo machine inlet and outlet”. Discuss the above in the light of laws of thermodynamics for turbo machine. 3.What are the applications of first laws and second of thermodynamics. 4.Define degree of reaction and derive a general expression for the degree of reaction.              5.At a stage of an impulse turbine, the mean blade diameter is 75 cm, rotational speed 3500 r. p. m. The absolute velocity of fluid discharging from nozzle inclined at 200 to the plane of wheel is 275 m/sec. if the utilization factor is 0.9 and the relative velocity at the rotor exit is 0.9 times that at inlet, find the inlet and exit rotor angles. Also find the power output from the stage for a mass flow rate of 2 kg/s and axial thrust on the shaft.