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
Isothermal Transformation: Austenite is not normally converted in martensite instantly but the procedure continues for some time. Various steels take various time for full tr

what is the affect of ambient temperature on the performance of GAS turbine

Use s of Carnot Cycle: 1. It helping us to appreciate what factors is desirable in the design of practical cycle; namely a maximum possible temperature range. 1 maximum p

A system consisting of 2kg of R-134a undergoes a cycle composed of the following processes: Process 1-2: constant volume from P1= 10 bar, x1=0.6 to saturated vapor. process 2-3 con

Resistance Spot Welding In this process, a spot of weld is made between overlapping sheets by means of two cylindrical copper alloy electrodes, one on top and the other at the

Please help me with this question if you are 100 % sure that you will assure me a perfect grade. Please let me know as soon as possible. I need the solution within 18 hours from no

What is the tesisting force

Q. Properties of plastic? Their great variety of physico- chemical and mechanical properties, and ease with they can be made into various articles have found plastic their wide

Question 1: There are different devices which may be used to attract the attention of the customers and persuade them to purchase merchandise. a) Make a list of at least te

GAS TUNGSTEN ARC WELDING (GTAW) Gas Tungsten Arc Welding (GTAW) is popularly known as Tungsten Inert Gas welding (TIG). In this process, an arc is struck between a non consumab