6. Which of the following are functions of bearings? (a) Ensure free rotation of shaft with minimum friction (b) Holding shaft in a correct position (c) Transmit the force of the shaft to the frame (d) All of the listed 7. In a fully operational hydrodynamic lubricated journal bearing (a) there is a film of lubricant between the journal and the bearing and the load is carried by both the lubricant and the surfaces (b) there is a film of lubricant between the journal and the bearing and the load is carried by only the lubricant (c) there is no lubricant between the journal and the bearing and the load is carried by the surfaces (d) there is a film of lubricant between the journal and the bearing and the load is carried by the lubricant and results in deformation of material 8. When two helical extension springs of equal lengths are arranged in parallel, then (a) the load carried by each spring will be the same (b) the displacement in each spring will be the same (c) the total displacement will be the sum of the individual displacements (d) all of the above 9. Which is the correct statement about bolts? (a) When an external load is placed on a bolt and a material, the material carries more of the load (b) When an external load is placed on a bolt and a material, the bolt carries more of the load (c) When an external load is placed on a bolt and a material, the material deflects the most (d) When an external load is placed on a bolt and a material, the bolt deflects the least 10. Tapered roller bearings can support (a) thrust load only (b) radial load only (c) both radial and thrust loads (d) neither radial and thrust loads 11. Failure of a key is typically due to what type of stresses? (a) Axial and bending (b) Axial and direct shear (c) Direct shear and bending (d) Bending and torsion