Answer:
The length of the rectangular key is 0.4244 m
Explanation:
Given that,
Power = 7.46 kW
Speed = 1200 rpm
Shearing stress of shaft = 30 MPa
Mini shearing stress of key = 240 MPa
We need to calculate the torque
Using formula of power
Where, P = power
N = number of turns
Put the value into the formula
We need to calculate the distance
Width of key is one fourth of the shaft diameter
The shear stress induced in key
Hence, The length of the rectangular key is 0.4244 m