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Sunday, February 26, 2017

ME6404 Thermal Engineering question Paper April/May 2016

B.E./B.Tech. Degree Examinations April/may 2016

Question Paper code : 57556

Fourth Semester

Mechanical Engineering

ME6404-THERMAL ENGINEERING
(Regulation 2013)

Answer All Questions

Part A- (10 x 2 = 20 Marks)

1. State the assumptions made in air standard cycle analysis?
2. Define Mean effective pressure. Show that on a p-v diagram.
3. Show the valve overlapping period of a typical 4-stroke petrol engine on valve timing diagram.
4. Define the phenomenon knocking in SI engines.
5. Draw the shape of a supersonic nozzle.
6. Distinguish between impulse and reaction principles.
7. Define volumetric efficiency of an air compressor.
8. State the conditions which lower the volumetric efficiency of an air compressor.
9. Show the simple vapour compression cycle on pressure-enthalpy diagram.
10. List out the basic elements of an air conditioning system.

Part-B (5 x 16 = 80 Marks)

11.(a) The compression ratio for a single-cylinder engine operating on a dual cycle is 9. The maximum pressure in the cylinder is limited to 60 bar. The pressure and temperature of the air at the beginning of the cycle are 1 bar and 30'C. heat is added during constant pressure process upto 4 percent of the stroke. Assuming the cylinder diameter and stroke length as 250 mm and 300 mm respectively. If the number of working cycle is 3 per second.

(OR)

(b) The  swept volume of a diesel engine working on a dual cycle is 0.0053 m3 and clearnce volume is 0.00035 m3. the maximum pressure is 65 bar. Fuel injection ends at 5 percent of the stroke. the temperature and pressure at the start of the compression are 80'C and 0.9 bar. determine air standard efficiency of the cycle.

12.(a) Describe with suitable sketches the following system of a modern carburetor. (i) Main metering system (ii) Idling system (iii) Economic system (iv) Acceleration pump system (v) Choke

(OR)

(b) (i) With a neat sketch, explain the principle of work of a diesel injector.
      (ii) A four stroke, four cylinder gasoline engine has a bore of 60 mm and a stroke of 100 mm. On test it develops a torque of 66.5 Nm when running at 3000 rpm. If the clearance volume in each cylinder is 60cc, the relative efficiency with respect to brake thermal efficiency is 0.5 and the calorific value of the fuel is 42 MJ/Kg, determine the fuel consumption in kg/h and the brake mean effective pressure.

13.(a) (i)Define critical pressure ratio of a nozzle and discuss why attainment of sonic velocity. Determine the maximum discharge through the nozzle.
(ii) Explain the metastable expansion of steam in a nozzle with help of h-s diagram.

(OR)

(b) A simple impulse turbine has one ring of moving blades running at 150 m/s. the absolute velocity of steam at exit from the stage is 85 m/s at an angle of 80’ from the tangential direstion. Blade velocity co-efficient is 0.82 and the rate of steam flowing through the stage is 2.5 kg/s. if the blades are equiangular, determine (i) Blade angles (ii) Nozzle angle (iii) Absolute velocity of steam issuing from the nozzle (iv) Axial thrust.

14.(a) A two stage air compressor consists of three cylinder having the same bore and stroke. The delivery pressure is 7 bar and the free air deliver is 4.3 m3/min. Air is drawn in at 1.013 bar, 150’C and an intercooler cools the air to 38’C. The index of compression is 1.3 for all three cylinders, Neglecting clearance volume. Calculate
(i) the intermediate pressure (ii) The power required to drive the compressor (iii) Isothermal efficiency.

(OR)

(b) With a neat sketch, describe the construction and working of a single-stage acting reciprocating air compressor. Also derive the equation for work done with clearance and without clearance.

15.(a) Describe the following refrigeration with layout : (i) Ammonia water system  (ii) Lithium-Bromide water system

(OR)

(b)(i) Describe the working principle of a centralized air conditioning system and enumerate the need for it.
(ii) List the loads the contribute to the overall cooling load.

ME6604 gas Dynamics and Jet propulsion question Bank

Unit-1

Basic Concepts and Isentropic Flows



PART-A
PART A


1.     Define compressible fluid and incompressible fluid.
2.     Define nozzle and diffuser.
3.     What is meant by velocity of sound?
4.     Define mach number& Crocco Number
5.     What do you meant by stagnation pressure and stagnation temperature?
6.     Define stagnation enthalpy and stagnation density.
7.     What are the various regions of flow? 
8.     Define Mach angle.
9.     What is meant by isentropic process?
10.    Define compressible fluid and incompressible fluid.
11.   What are the types of nozzles?
12.    What is meant by stagnation state?
13.      Define Mach cone and Mach wave.



PART-B

1.     Derive an expression for the effect of mach number on compressibility.

2.     Derive the expression for an energy equation.

3.     A supersonic diffuser diffuses air in an isentropic flow from a mach number of 3 to a mach number of 1.5. The static conditions of air at inlet are 70 kpa and -7 C. If the mass flow rate of air is 125 kg/s, determine the stagnation conditions, areas at throat and exit, static conditions (pressure, temperature, velocity) of air at exit.

4.     A supersonic nozzle expands air from Po = 25 bar and T0 = 1050 K to an exit pressure of 4.35 bar: the exit are of the nozzle is 100 cm2. Determine i) throat area ii) pressure and temperature at the throat iii) temperature at exit iv) Exit velocity as fraction of the maximum attainable velocity v) mass flow rate.

5.     A conical diffuser has entry and exit area of 0.11 m2 and 0.44 m2 respectively. The pressure, temperature and velocity of air at entry are 0.18 Mpa, 37 ‘C and 267 m/s respectively.  Determine i) mass flow ratw  ii) the mach number, static temperature and static pressure of the air leaving diffuser  and iii) the net thrust acting on the diffuser

6.     Air at P1=3 bar and T1=227 C is flowing with a velocity of 200 m/s in a 0.3m diameter duct. If Cp=1050 J/KgK and ν=1.38. Determine the following
(i)                Stagnation temperature and pressure
(ii)             Mass flow rate of air
(iii)           Mach number
                (Iv) Stagnation pressure. Assuming the flow is in compressible.






Tuesday, February 14, 2017

Toppers advice for JEE main

Toppers advice for JEE main

·        JEE main  toppers say systematic study play a key role in cracking the exam.And says“In order to succeed, onemust first believe that they can”. The toppers believe that a smart routine of just 4-5 hours of study a day helped them achieve that feat, sincere efforts and hard work always yield exceptional results.
·        Attempt clearly all the basic concepts and then practice questions based on it, also should take a lot of mock tests and practice from sample papers as well as previous year’s question papers. This way aspirants can recognize weakareas and converted them into strengths by focusing more on learning concepts.
·        One must study sincerely and effectively, no matter whether it's only for 2 to 3 hours daily. On an average, study for 4 to 5 hours in a day. However, a month before the JEE Main exam, study for around 8 hours daily.
·        The most important thing is not to overburden mind with preparation. Even if you are studying for 2 to 3 hours, make sure that you put in your 100 per cent.
·        Proper planning and systematic study play a key role in cracking competitive examinations. Also, remember to keep calm during the test and give best shot.
·        Though they say that there is no substitute to hard work, but hard work coupled with effective time management bring fruitful results says the toppers.
·        The champions believe that one must listen to his/her inner calling and when decided, must put every ounce of his/her being into accomplishing it.
·         Strictly follow the curriculum given by the mentor. Diligently revise whatever is taught at coaching. Apart from school and coaching, study for around 4–5 hours daily.
·        Toppers tells Coaching is not necessary to crack JEE, but it brings punctuality and discipline in aspirants. Coaching also provides guidelines to a candidate for preparation. However, joining a coaching is always a personal choice of a student.
·        Always follow the heart while preparing for the exam and do whatever is required to crack the exam.
·         Aspirants must also manage their time during their preparation in a way that they allocate equal time to all the three subjects.
·        Develop an interest and explore the beauty of the subjects, it will not be a big deal to crack the exam.
·         Along with school and coaching, make sure to keep some time for focused self-preparation.
·        It is important to keep calm during hectic preparation phase and never get tired of putting consistent efforts.
·         Don’t get demotivated by failures. Even if could not perform well at some point, always keep inspiration level high and give best next time.
·        Working hard for having conceptual clarity rather than cramming.
·        Keep on learning and practicing all concepts and topics that were being taught in school and coaching classes.
·        Aspirants can study NCERT books thoroughly as it will strengthen concepts and help in staying confident. Always keep faith in oneself.
·        Always try to remind that do not lose concentration. It is also very important to know strengths and weaknesses later always try to convert weaknesses into strengths.
·        Don’t be nervous at any stage. Think that , you will get Top Engineering colleges in India .
·        If willing to achieve, then will achieve it.
·         Focus on clearing concepts is the key to success. 
·         Follow a simple strategy of revising and do not get relaxed after writing exam. Take maximum one day gap and start preparing for the next level.
·        Revising what you have learned in the entire day.
·        Preparation gets easy when you revise what you have learned in the entire day, solve previous years, sample papers, which is important to get to know about the types of questions that are covered in the pattern.
·        The toppersemphasizes on systematic study and equal importance to all the three sections – Physics, Chemistry and Mathematics – as these were the key factors of  success in the exam. 
·        Coaching is a personal choice, whether one wants to go for it or not, for JEE Main you need to really have hold on basic concepts.  If you are clear with concepts then need not worry.
·        All aspirants not only aim for a good rank but strive to achieve the best. The best is to do is by getting your concepts right.
·         One should not get stressed while preparing for the exam. If someone wants to focus on only selected topics, they should make sure that they practice and revise those topics well.
·        Revision is necessary, it helps in clearing concepts.
·        One of the most important key to success is to understand the concepts. The concepts should be so clear that you can answer them no matter how twisted the question is.
·        Increasing speed and accuracy in solving questions.
·        Do not over-study, otherwise will get bored and depressed.
·         Never get demotivated by any failure, JEE preparation will be all about ups and downs, Maintain a positive approach and always stay self-motivated.




Sunday, February 5, 2017

ME6604 Dynamics and Gas Dynamics and Jet Propulsion Lecture Notes

Anna University Chennai
Department of Mechanical Engineering
Sixth Semester
ME6604 Gas Dynamics and Gas Dynamics and Jet Propulsion (GDJP)
Lecture Notes
(Regulation 2013)

Attachment: Click Here to Download ME6604 Gas Dynamics and Gas Dynamics and Jet Propulsion Lecture Notes in PDF

ME6401 Kinematics of Machinery Lecture Notes in PDF

Anna University Chennai
Department of Mechanical Engineering
Fourth Semester
ME6401 Kinematics of Machinery
Lecture Notes
(Regulation 2013)

Attachment: Click Here to Download ME6401 Kinematics of Machinery Lecturer Notes in PDF