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VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

A screw jack raises a load of 40 kN. The screw is square threaded having three threads per 20 mm length and 40 mm in dia. Calculate the force required at the end of a lever 400mm long measured from the axis of the screw, if the coefficient of friction between screw and nut is 0.12.

A screw jack raises a load of 40 kN. The screw is square threaded having three threads per 20 mm length and 40 mm in dia. Calculate the force required at the end of a lever 400mm long ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

A lifting machine having a velocity ratio of 28 starts raising a load of 6420 N on applying an effort of 45 N to it. If suddenly the effort is removed find whether the load comes down or not?

A lifting machine having a velocity ratio of 28 starts raising a load of 6420 N on applying an effort of 45 N to it. If suddenly the effort is removed find whether the load comes down or ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

In a lifting machine in which velocity ratio is 30, a load of 5000 N is lifted with an effort of 360 N. Determine whether it is self-locking or reversible machine. How much is the frictional resistance?

In a lifting machine in which velocity ratio is 30, a load of 5000 N is lifted with an effort of 360 N. Determine whether it is self-locking or reversible machine. How much is the frictional resistance?

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

In a lifting machine an effort of 150 N raised a load of 7700 N. What is the mechanical advantage? Find the velocity ratio if the efficiency at this load is 60%. If by the same machine, a load of 13,200 N is raised by an effort of 250 N, what is the efficiency? Calculate the maximum mechanical advantage and the maximum efficiency.

In a lifting machine an effort of 150 N raised a load of 7700 N. What is the mechanical advantage? Find the velocity ratio if the efficiency at this load is 60%. If by the same machine, a ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

In a simple machine, whose velocity ratio is 30, a load of 2400 N is lifted by an effort of 150 N and a load of 3000 N is lifted by an effort of 180 N. Find the law of machine and calculate the load that could be lifted by a force of 200 N. Calculate also: a. The amount of effort wasted in overcoming the friction, b. Mechanical advantage, and c. The efficiency.

In a simple machine, whose velocity ratio is 30, a load of 2400 N is lifted by an effort of 150 N and a load of 3000 N is lifted by an effort of 180 N. Find the ...Read more