Machine Design MCQs

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

square threads

acme threads

knuckle threads

buttress threads

variations in load acting on a member

variations in properties of materials in a member

abrupt change of cross-section

all of these

bolts and nuts

studs

headless taper bolts

none of these

load is in between the fulcrum and effort

effort is in between the fulcrum and load

fulcrum is in between the load and effort

none of these

d2 x τ x n

1.875 x d2 x τ x n

2 x d2 x τ x n

3 x d2x τ x n

The addendum is less than dedendum

The pitch circle diameter is equal to the product of module and number of teeth

The pitch circle is always greater than the base circle

all of the above

to reduce friction

to facilitate slipping of balls

to prevent the lubricant from flowing out

to maintain the balls at a fixed distance apart

less than 50%

more than 50%

equal to 50%

none of these

increases

decreases

does not change