Question

A steel shaft has to transmit a mean power of 100 kw at 250 rpm. The allowable shear stress is 75 mpa and the maximum power transmitted exceeds the mean power by 30%. Determine

Answer 1

Answer:

Find the power transmitted by a shaft of 25mm diameter running at 400 rpm. Take Allowable shear stress for shaft material as 65 Mpa.

{Ans:P=8.35 Kw}

Prob 2. A solid shaft of diameter 60 mm is running at 150 rpm. Find the power that can be transmitted by the shaft if permissible shear stress is 80 N/mm2 , Maximum torque is likely to exceed 30% more than mean torque. {i.e. Tmax=1.30 T avg}

{ Ans:P=40.84 Kw}

Prob 3. Find the power that can be transmitted by a hollow shaft having external diameter 200mm and internal diameter 120 mm. The shaft is running at 110 rpm. Allowable shear stress for the material is 63 Mpa. Maximum torque is likely to exceed 20% more than mean torque.

{ Ans:826.78 Kw}

Prob 4.A hollow shaft of external and internal diameters as 100mm and 40mm is transmitting power at 120 rpm. Find the power it can transmit if the shearing stress is not to exceed 50mpa.

{ Ans:120.13 KW}

Prob 5. Find the Power that a solid shaft of 100 mm diameter running at 500 rpm can transmit ,if angle of twist is 1.5 degrees in a length of 2m. Take G=70 GPa.

{ Ans:471 KW}

Prob 6.A hollow shaft of external and internal diameters as 80mm and 40mm is required to transmit torque from one pulley to another. What is the value of torque transmitted, if the angle of twist is not to exceed 3 degrees in a length of 2 meters. Take modulus of rigidity as 80 Gpa.

{ Ans:T=}

Prob 7. What is the torque induced in a solid circular shaft of diameter 50 mm rotating at 100 rpm , if the permissible shear stress is not to exceed 75 Mpa.

{ Ans: }

Prob 8. A solid circular shaft of 30 mm diameter is subjected to a torque of 250 N-M causing an angle of twist 3.74 degrees in a length of 2m. Determine the modulus of rigidity of the material of the shaft.

{ Ans: }

9. A solid circular shaft of 100mm diameter transmits 120KW at 200 rpm. Find the maximum shear stress and angle of twist for a length of 6m.Take G=80 GPa.

{Ans : Stress= Mpa,Angle= deg}

Explanation: