Thermal efficiency and compression ratio, Mechanical Engineering

Assignment Help:

Thermal efficiency and compression ratio:

Calculate thermal efficiency and compression ratio for automobile working on otto cycle. If energy generated per cycle is thrice which of rejected during the exhaust. Consider fluid as an ideal gas with = 1.4       

Sol.: Since we have

Where

Wotto = (Q1  - Q2)/Q1

Q1 = Heat supplied

Q2 = Heat rejected

Given that     Q1 = 3Q2

otto = (3Q2  - Q2)/3Q2  = 2/3 = 66.6%                                                   ...(i)

We also have;

Qotto = 1 - 1/(r)  - 1

0.667 = 1/(r)1.4 - 1

r = (3)1/0.4  = 15.59

 


Related Discussions:- Thermal efficiency and compression ratio

Define Disadvantages of electro discharge machining, Define Disadvantages o...

Define Disadvantages of electro discharge machining? a) The wear rate on the electrode is significantly higher. b) The work piece must be electrically conductive to be machi

Computer control system in flexible manufacturing system, Computers control...

Computers control system in flexible manufacturing system

How can we use cereals, Q. How can we use Cereals? Foundry cereal is fi...

Q. How can we use Cereals? Foundry cereal is finely ground corn flour or corn starch. It (0.25-2%) increases the green and dry strengths of the moulding sand. Since the cereal

Calculate the stress at the outer edges, A column is made from a universal ...

A column is made from a universal I-section 203x 203 x 60. A load of 96kN is applied on the y-axis offset 50mm from the centroid. Calculate the stress at the outer edges of the y-a

#title., Derive and expression for force exerted by a jet of water on fixed...

Derive and expression for force exerted by a jet of water on fixed vertical plate in direction of

Projection welding, Projection Welding   This is a modified method o...

Projection Welding   This is a modified method of making single or multiple spot welds. Projection welds are made by providing an embossment or projection on one or both of

Explain the function phase of radial drilling machine, Function Phase: ...

Function Phase: Steps: 1. To identify the functions. To identify the functions regarding to the problem in radial drilling machine. Our project focus on the create an a

What are the reasons behind poor pick-up of motor cycle, (a) Why does engin...

(a) Why does engine overheat and what will happen if engine overheats? (b) Why engine does not start in wet or damp weather? (c) What may be the causes if engine dose not sta

Internal and external diameters - solid shaft, Internal and external diamet...

Internal and external diameters - solid shaft: Two shafts are of the similar material, length & weight. One is solid & of 100 mm diameter, the outer is hollow. If hollow shaft

Mr, I need rewording

I need rewording

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