variations in load acting on a member

variations in properties of materials in a member

abrupt change of cross-section

all of these

elastic limit

Young's modulus

ultimate tensile strength

endurance limit

enhance the load carrying capacity of the jack

reduce the effort needed for lifting the working load

prevent the rotation of load being lifted

reduce the value of frictional torque

shaft B is better than shaft A

shaft A is better than shaft B

both the shafts are equally good

none of these

The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts

The V-belt drive is used with large centre distance

The V-belt may be operated in either direction with tight side of the belt at the top or bottom

The ratio of driving tensions in V-belt drive is more than flat belt drives