Woodruff key permits            movement b/w shaft and the hub.

Related MCQs

• 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.
• If allowable shear stress in the shaft is 70N/mm² and torsional and bending moments are M=1185000N-mm and m=330000N-mm, find the diameter of the shaft.
• If a clearance fit is present between shaft and hole, what is the tolerance on shaft or hole for a complete interchangeable approach?
• Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm².
• The strength of hollow shaft is more than the strength of solid shaft of same weight.
• The stiffness of solid shaft is more than the stiffness of hollow shaft with same weight.
• Solid shaft is costlier than hollow shaft of same weight.
• The diameter of the hub of the flywheel is usually taken
• If bending moment on point B in horizontal plate is M and in vertical plane is m, then the net bending moment at point B is? "The layout of a shaft supported on bearings at A & B is shown. Power is supplied by means of a vertical belt on pulley B which is then transmitted to pulley C carrying a horizontal belt. The angle of wrap is 180’ and coefficient of friction is 0.3. Maximum permissible tension in the rope is 3kN. The radius of pulley at B & C is 300mm and 150mm"
• Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.