Find out the effort required to run this machine, Mechanical Engineering

Assignment Help:

Find out the effort required to run this machine:

The efficiency of a machine is 75% while an effort of 20 N is required to lift a load of 160 N. Compute the velocity ratio and frictional force of the machine in terms of effort and load. What is the law of machine if frictional resistance of the machine is constant? Find out the effort required to run this machine at a load of 200 N.

Solution

Given :

Efficiency (η) = 75% Effort (P) = 20 N

Load lifted (W) = 160 N

Mechanical Advantage (M A) = 160 /20 = 8

Velocity Ratio (V R) = MA/ η = 8.0/ 0.75

                                                   = 10.67         Ans.

Frictional force in terms of load (FW) = P × V R - W

or         FW = 20 × 10.67 - 160

                         = 53.4 N

Frictional force in terms  of effort (F P ) = P -  (W/ V R)

or         FP  = 20 - (160 /10.67) = 5 N

 The effort needed to overcome friction is 5 N, which is constant. In the law of machine, the factor C is constant which is equal to effort required when load lifted is zero.

Therefore,       C = FP = 5 N

Therefore, law of the machine can be written as :

                    P = m W + 5

For       P = 20 N and W = 160 N

20 = 160 m + 5

or         m = (20 - 5) /160=15/160 =  3 /32

Substituting for m, the law of machine is given by :

P =  (3/32) W + 5                         Ans.

For load           W = 200 N

P =  (3 /32) × 200 + 5 = 23.75 N            Ans.


Related Discussions:- Find out the effort required to run this machine

Electric discharge phenomenon, ELECTRIC DISCHARGE PHENOMENON The flow of ...

ELECTRIC DISCHARGE PHENOMENON The flow of electricity through metallic solids, or through liquid metals is called Conduction. The electricity  flow through ionic solutions

Systematic layout planning, What are the primary benefits of using computer...

What are the primary benefits of using computerized layout procedures vs. Systematic Layout Planning (SLP) procedures done by hand?

Frames, Introduction and conclusion on frames

Introduction and conclusion on frames

Standard factory formed insulation on flanges and valves, Q. Standard facto...

Q. Standard factory formed insulation on Flanges and Valves? All fittings are to be insulated with standard factory formed insulation. All joints shall be buttered and sealed.

Authoe, can i ask who the author of this website is?

can i ask who the author of this website is?

What is the maximum load the spring may carry, What is the maximum load the...

What is the maximum load the spring may carry: Any close coiled helical spring has mean diameter of 80 mm, has spring constant of 100 kN/m. It contains 10 coils. The maximum s

Electrodes- stainless steel electrodes, Stainless Steel Electrodes A vari...

Stainless Steel Electrodes A variety of stainless steel electrodes are now being manufactured to produce weld metal similar to composition of most base metals. However, the analy

Determine the angle of jet, A jet of water moving at 8 m/sec. impinges on a...

A jet of water moving at 8 m/sec. impinges on a concave-shaped vane to deflect the jet through 120 o when stationary. If the vane is moving at 5 m/sec., determine the angle of jet

Determine the maximum stress developed in the beam, Determine the maximum s...

Determine the maximum stress developed in the beam: An I section in Figure is utilized as a beam. The beam is subjected to a bending moment of 2.5 kN m at its neutral axis. De

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd