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%


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. What do you mean by Velocity - Area Method? Out of the above four categories, velocity area method is most widely used and provides more accurate results. Requirements of a

(a) Comment on the require to idealise a body as a particles, a rigid body or a continuum. (b) What do you mean by an inertial reference ? (c) Define quantitatively a force 1

(a ) What are the demerits and merits of sliding mesh gear box? (b) Show a four speed gear box, including reverse speed for a passenger car and illustrate how the speed ratio is

Arc Spot Welding In this process, coalescence at the overlapping surfaces is produced in one spot by heating with an electric arc between an electrode and the work. The weld i

Beam: Sol.: A beam can be defined as a structural element which has one dimension (length) considerable larger As compared to the other two direction, which is breadth an

(a) Show that for an adiabatic process Pv r = C, holds good. (b) One Kg of a contain gas is at 0.11 KPa and 15 o C. It is compressed until its volume a 0.1m 3 . if the compress

with the aid of a diagram explain electrochemical grinding

consider the following LPP max z=9x1+8x2+5x3 subject to 2x1+3x2+x3 5x1+4x2+3x3 x1,x2,x3>_0 (a)solve using simlex method (b)hence using the sesitivity analysis,find the new optimal

Types of Gas Welding Process Gas welding includes all those welding processes in which gas flame is used as a heat source for melting metals. It is further divided into three m