When we want to use a machine as a force multiplier then:

   When we want to use a machine as a speed multiplier then:

     Mechanical advantage of a machine is given by:

    For an ideal machine:

The  correct relationship between mechanical advantage (M.A) the velocity ratio(V.R) and the efficiency (η)

  A nut which can be broken by applying a force of 40 Kgf , is broken by using a nutcracker having its handle 20 cm long, by placing it at a distance 2 cm from the hinge. Calculate the minimum force needed to break the nut?

     A movable  pulley is used as:

   A single fixed pulley is used because it:

The mechanical advantage of an ideal pulley is:

A woman draws water from a well using a fixed pulley. The mas of the bucket and water together is 6 kg. The Force applied by the woman is 670 n. Calculate the mechanical advantage.

A pulley system with velocity ratio 4 is used to lift a load of 150 kgf through a vertical height of 20 m. The effort required is 50 kgf in the downward direction. Calculate the distance move by effort.

The ratio of useful work done by the machine to the work done on the machine is called as:

Which of the following is an example for simple machine?

A ___acts to change the direction of the force applied in order to lift baby objects.

   ____can be used to draw water from a well.

Mechanical advantage is denoted as:

  Which of the following is an example of simple machine?

    A single fixed pulley and a movable pulley both are separately used to lift aload of 50 gf to the same height. Compare the efforts applied.

Which of the statement is not true for a machine ?

   A lever which always has mechanical advantage less than 1 has:

The correct relationship between the effort (E) load (L) and mechanical advantage(M.A.) is:

  The correct relationship between the velocity ratio (V.R) the distance through which effort act (d) and the distance through which load moves (D):

A women draws water from a well using a fixed pulley. The mass of the bucket and water together is 6 kg. The force applied by the women is 70 N. The mechanical advantage is:

     A boy uses a single movable pulley to lift a load of 50 kgf to some height. Another boy uses a single fixed pulley to lift the same load to same height. The ratio of efforts applied by them is:

  A block and tackle system has VR = 5. Rahul exerts a pull of 150 kgf. What is the maximum load he can raise with this pulley system if its efficiency = 75%?

     A pulley system has a VR = 5. If the efficiency of the system is 80%, find its MA.

     A pulley system has MA = 4. If a load of 10 kgf is pulley by a distance of 2 m in10 s, calculate the power developed by the effort.

A fulcrum divides a crow-bar in the ratio 3 : 1. What weight will be lifted if an effort of 100 N is applied at the end of its longer arm?

   The M.A. of sugar tongs is:

A machine is driven by a 100 kg mass that falls 8 m on 4 seconds. It lifts a load of mass 500 kg. If the efficiency of the machine is 75%, what is the power output?

     The MA of a machine is 5 and its efficiency is 80%. It is used to lift a load of 200kgf to a height of 20 m. What is the effort required?

    The correct relationship between the efficiency (1), mechanical advantage (M.A.)and velocity ratio (V.R.) of an actual machine is :

A  fire tong is a lever of:

    A person standing vertically upon his toes is an example of lever of :

     A lever which always have mechanical advantage more than 1 is:

A lever which can have mechanical advantage either less than one or more than one depending upon the position of fulcrum is a lever of:

     In operating a water pump, a resistance of 480 N is overcome by an effort of 72 N. If the distance of the fulcrum from the point where the resistance act is 0.2m. Find the distance from the fulcrum where effort is applied.

A uniform plank of a see-saw is 5m long and supported at its centre. A boy weighing 40 kgf sits at a distance 1.5 m from one end of the see-saw where musta girl weighing 25 kgf sit on the other end of the see-saw so as to balance the boy ?

    An effort of 50 kgf is applied at the end of a lever of the second order, which supports a load of 750 kgf, such that the load is at a distance of 0.1 m from the hinge. Find the length of the lever. (Assume that the lever is weightless)

  A key is 5 cm long the turns the levers of a lock at a distance 1 cm. If the lock is opened by an effort of 10 N, calculate the resistance offered by the levers of the lock.