A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at θ with horizontal.
Explanation: F=PSinθ and width=h/(Sinθ+Cosθ).
Maximum shear stress in transverse fillet weld of leg h and length l is
Explanation: τ= PSinθ(Sinθ+Cosθ)/hl, by maximising it θ=67.5’ and hence find corresponding τ.
A sunk key fits in the keyway of the _____ only.
Explanation: Sunk key fits halfway in the hub and halfway in the shaft.
Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.
Explanation: The resistance to slip in case of flat key is more.
Saddle key is more suitable than sunk key for heavy duty applications.
Explanation: In sunk key, relative motion is also prevented by shear resistance of sunk key and hence sunk key is recommended.
The main advantage of sunk key is that it is a _____ drive.
Explanation: Sunk key is a positive drive and no slip occurs.
Woodruff key permits _____ movement b/w shaft and the hub.
Explanation: Woodruff key is a sunk key and doesn’t permit axial moment.
Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.
Splines are keys.
Explanation: Splines are keys made with shafts.
Involute splines have stub teeth with a pressure angle of ___
Explannation: Pressure angle is 30’ and not 60’.