In a movable pulley, the load is . The mechanical advantage, effort applied and V.R respectively, if the efficiency is percentage are:
Important Questions on Machines
Draw a diagram to show a block and tackle pulley system having a velocity ratio of marking the direction of load (L), effort (E) and tension (T).
The pulley system drawn lifts a load of when an effort of is applied. Find its mechanical advantage. Is the above pulley system an ideal machine or not?
velocity ratio,
mechanical advantage,
resistance overcome by the machine.
Draw a diagram of a block and tackle system of pulleys having a V.R. of . In your diagram, indicate clearly the points of application of load and effort.
Calculate: (i) the load arm, (ii) the effort arm, (iii) the mechanical advantage and (iv) the minimum effort required to keep the leg just off the ground.
(a) Calculate the power input to the pulley taking the force of gravity on as .
(b) the efficiency of the pulley, and the height to which the load is raised in .
The mechanical advantage,
The effort to lift a body of ,
The resistance due to the movable parts of the machine and friction.
velocity ratio,
mechanical advantage,
percentage efficiency of machine which can overcome a resistance of through a distance of , when an effort of acts through a distance of .
What force should be directly applied on the nut, so as to crack it without the help of nutcracker?
Diagram alongside shows a nutcracker with a wooden base. If the effort required to crack the nut is , find the resistance offered by the nut.
Define the following:
Velocity ratio
