Find out the amount of energy spent, Mechanical Engineering

Find out the amount of energy spent:

6 cubic metre of water is to be lifted to a height of 40 metres and delivered having velocity of 4 metres/sec. If this operation takes 12 mintues, find out

1.      the amount of energy spent

2.      H. P. utilized

3.      H. P. of water-pump whose efficiency is 80%

Solution

Work is needed to be done on water to

1.      raise its potential energy, and

2.      Develop KE of water.

 

A.      Potential Energy = W × H

                  Here,         W = Weight of water lifted in Newtons

                      One litre of water = 1 kg = 9.8 Newtons

                       ∴ 6 cu. m. of water = 6000 litres.

                       ∴ W = 6000 g  N

                         ∴ Enhance in PE of water = 6000 g × 40

                                                 = 2352 × 103 N-m.

B.      Work done to provide KE to water = W V2 /2g

                                                                      = (6000 × 42)/2

                                                                        = 48 × 103  N- m.

Whole amount of energy spent = PE + KE

                                                     = (2352 + 48) × 103  N-m.

                                                            = 2400 × 103  N-m.

H. P. utilized in (S. I. units) = (2400 × 103) / 746

                                            = 3217 units

If pump efficiency = 0.8 or 80%

H. P. required for pumps

= 3217 /0.8  = 4021 units.

Posted Date: 1/29/2013 7:07:51 AM | Location : United States







Related Discussions:- Find out the amount of energy spent, Assignment Help, Ask Question on Find out the amount of energy spent, Get Answer, Expert's Help, Find out the amount of energy spent Discussions

Write discussion on Find out the amount of energy spent
Your posts are moderated
Related Questions
Q. Inspection and testing of vessels? The Vendor shall be responsible for all inspection and testing. WorleyParsons reserves the right to inspect vessels or parts of vessels at

Find out the velocity of the bullet: A bullet of weight W 1   = 5 N is fired into a body B 2 of weight W 2   = 45 N suspended by a string of length L = 1 metres. Because of i


The open square tube is subjected to the torque T= DEF Nm as shown in Fig Q2. The tube has the length 1m and wall thickness 5mm. a)  Calculate the shear stress and angle of

Newton's law of motion. Sol.: The entire system of Dynamics is based on the three laws of motion that are basis assumptions, and were initially formulated by Newton. Fir

T w o Stroke and Four Stroke Engines: In  the two stroke engines thermodynamic cycle is completed in One revolution of crank shaft whereas in 4 stroke engines the cycle is c

(a) What is cushioning effect of a tyre? (b) What are the desired properties of a wheel?


case study for factors affecting process design decisions

Q. Piping Inspection and Test Plan? Piping Inspection and Test Plan review and Piping Materials Test Results review shall be by the Piping Materials group, or by / with assista