Showing posts with label Anna university questions. Show all posts
Showing posts with label Anna university questions. Show all posts

Monday, 16 November 2015

Computer Aided Design University Questions

ANNA UNIVERSITY-CHENNAI
REGULATION 2013
ME6501-COMPUTER AIDED DESIGN
TWO MARKS QUESTIONS WITH ANSWERS 

UNIT-3

1.What is the need of visualization?
Visualization in geometric modeling is helpful in finding connection in the design applications. By shading the parts with various shadows, colors and transparency, the designer can recognize undesired unknown interferences. In the design of complex surfaces shading with different texture characteristics can use to find any undesired quick modifications in surface changes.

2.What is hidden solid removal?
The hidden solid removal problem involves the view of solid models with hidden line or surface eliminated. Available hidden line algorithm and hidden surface algorithms are useable to hidden solid elimination of B-rep models.

3.What is powder shading?
Powder shading is a sketching shading method. In this style, the stumping powder and paper stumps are used to draw a picture. This can be in color. The stumping powder is smooth and doesn't have any shiny particles. The poster created with powder shading looks more beautiful than the original. The paper to be used should have small grains on it so that the powder remains on the paper.

4.Mention the advantages and limitations of ray tracking algorithm.
Advantages of Ray tracing:
1. A realistic simulation of lighting over other rendering.
2. An effect such as reflections and shadows is easy and effective.
3. Simple to implement yet yielding impressive visual results.
 Limitation of ray tracing:
Scan line algorithms use data consistency to divide computations between pixels, while ray
tracing normally begins the process a new, treating every eye ray separately.

5.What is hidden line removal?
Hidden line removal (HLR) is the method of computing which edges are not hidden by the faces of parts for a specified view and the display of parts in the projection of a model into a 2D plane.

6.What is hidden solid removal?
The hidden solid removal problem involves the view of solid models with hidden line or surface eliminated. Available hidden line algorithm and hidden surface algorithms are use able to hidden solid elimination of B-rep models.

7.List out the various visualization approaches.
Parallel projections
Perspective projection.
Hidden line removal
 Hidden surface removal
 Hidden solid removal
 Shaded models

8.Mention any two surface removal algorithm.
1. Z - buffer algorithm
2. Painters algorithm


Click here Unit I 2 marks and Answers

 Click here Unit II 2 marks and Answers


Click here Unit IV 2 marks and Answers

 Click here Unit V 2 marks and Answers

 For all units of CAD and other mechanical engineering subjects study materials is uploaded see right side of the page you can download whatever materials you need to study or copy and paste the following link :annaunivstudymaterials.blogspot.com



Posted by at No comments:
Labels: , , , ,

Saturday, 14 November 2015

ME6503 Design of machine elements important questions

ANNA UNIVERSITY CHENNAI
REGULATION 2013
ME6503-DESIGN OF MACHINE ELEMENTS
       UNIVERSITY QUESTIONS  
UNIT-IV
PART-A


1. Define surge in a spring?

2. What is nipping of a leaf spring?

3. Define the term fluctuation of energy with reference to flywheels.

4. What is meant by semi elliptical leaf springs?

5. A helical spring of rate 12N/mm is mounted on the top of another spring of rate 8 N/mm. find

the force required to give a deflection of 50mm.

6. What is the purpose of flywheel that is used in an IC engine?

7. What is constant width and constant strength springs?

8. Define spring index.

9. What is Wahl factor and why is it required?

10. What is the objective of the nipping of the leaf spring?

11. Write the advantage of Belleville spring.

12. Write the formula for natural frequency of spring.

13. How does the function of flywheel differ from that of governor?

14. In what respect the flywheel differs from the governor.

15. What type of external forces act on connecting rod?

Part – B

1. A safety valve, 50mm in diameter, is to blow off at a pressure of 1.5 MPa. It is held on its seat by means of a helical compression spring, with an initial compression spring, with an initial compression of 25mm. the maximum lift of valve is 10mm. the spring index can be taken as 6.   The spring is made of patented and cold drawn steel wire with ultimate strength of 1500N/mm²and modulus of rigidity of 81370N/mm². The permissible shear stress for thespring wire should be taken as 30% of the ultimate strength. Design the spring and calculate :

(i) Wire diameter;

(ii) Mean coil diameter;

(iii) Number of active turns;

(iv) Total number of turns;

(v) Solid length of spring;

(vi) Free length of spring;

(vii) Pitch of the coil.     

2. A helical compression spring is used to absorb the shock. The initial compression of the spring is 30mm and it is further compressed by 50mm while absorbing the shock. The spring is to absorb 250J of energy during the process. The spring index can be taken as 6. The spring is made up of patented and cold drawn steel wore with an ultimate tensile strength of 1500N/mm² and modulus of rigidity of 81 kN/mm². The permissible shear stress for the spring wire should be taken us 30% of the ultimate strength. Design the spring and calculate :

(i) Wire diameter

(ii) Mean coil diameter

(iii) Number of active turns

(iv) Free length &


3. Design a helical spring for a spring loaded safety valve (Ramsbottom safety valve) for the following conditions: Diameter of valve seat = 65mm; Operating pressure = 0.7 N/mm²; Maximum pressure when the valve blows off freely = 0.75 N/mm²; Maximum lift of the valve when the pressure rise from 0.7 to o.75 N/mm² =3.5 mm; Maximum allowable stress= 550MPa; Modulus of rigidity = 84 kN/mm²; Spring index = 6.

4. Design a cast iron flywheel used for a four stroke.  I.C engine developing 180 kW at 240r.p.m. The hoop or centrifugal stress developed in the flywheel is 5.2 MPa, the total fluctuation of speed is to be limited to 3% of the mean speed. The work done during the power stroke is 1/3 more than the average work done during the whole cycle. The maximum torque on the shaft is twice the mean torque. The density of cast iron is 7220 kg/m³.

5. A Spring loaded safety valve for a boiler is required to blow off at a pressure 1.5N/mm².The diameter of the valve is 60 mm. Design a suitable compression spring for the safety valve, assuming spring index to be 6 and 25 mm initial compression. The maximum lift of the valve is 15 mm. The shear stress in the spring material is to be limited to 450 Mpa. Take G=0.84 Mpa.

6. A Multi cylinder engine is to run at a constant load of 600 rpm. On drawing the crank effort diagram to scale of 1 mm=250 N-m and 1 mm ,the areas in square mm above and below the mean torque line were measured and found to be in order +160,-172,+168,-191,+197,and -162.The speed is to be kept within ±1% of the mean speed of the engine. Determine the moment of inertia of the flywheel.

7. A Closed coil helical compression spring has plain ends and is to fit over a 25 mm diameter rod. When a compressive force of 100 N is applied to the spring it compressed by 50 mm. If the spring has a perfect wire diameter of 4mm, and the spring material has a maximum allowable shear stress of 180 MN/ and a modulus of rigidity81GN/m2.Determine,                                                                                                                                                  a) the mean coil diameter of the spring. (b)The diametrical clearance between the spring and the rod. c) The number of coil in the spring. (d)The solid length of the spring.

8. The areas of the turning moment diagram for one revolution of a multi cylinder engine with reference to the mean turning moment, below and above the line are -32,+408,-267,+333,-310,+226,-374,±260 and -244.The scale for abscissa ordinate are:1mm= and 1mm=650 N-m respectively.The mean speed is 300 rpm with a percentage speed fluctuation of ±1.5%.If the hoop stress in the material of the is not to exceed 5.6 Mpa, determine the suitable diameter and cross section for the flywheel, assuming that the width is equal to 4 times the thickness. The density of the material may be taken as 7200 Kg/.Neglect the effect of the boss and arms.

9. Design a closed coiled helical compression spring for a load range varying from 2.25 KN to 2.75 KN and corresponding axial deflection of 6mm.Spring index is 5.Permissible shear stress is 400 N/ and modulus of rigidity is 80 KN/.

10. The turning moment diagram of an engine has areas above and below the mean torque line of +530,-330, +380,-470,+180,-360,+350 and -280 sq.mm. The scales of the diagram are:Turning moment 1mm=1000 N-m, Crank angle=1mm=.The mean speed is 150 rpm and the total fluctuation of speed is not to exceed 3% of the mean speed. Design a suitable flywheel.

11. A Helical compression spring made of oil tempered carbon steel is subjected to a load which varies from 400 N to 1000N.The spring index is 6 and the design factor of safety is 1.25.If the yield stress in shear is 770 MPa and endurance stress in shear is 350 MPa, find (a) Size of the spring wire, (b) Diameter of the spring, (c) Number of turns of the spring, (d) Free length of the spring. The compression of the spring at the maximum load is 30 mm. The modulus of rigidity for the spring material may be taken as 80 KN/.

12. A Single cylinder double acting steam engine delivers 185 kW at 100 rpm. The maximum fluctuation of energy per revolution is 15% of the energy developed per revolution. The speed variation is limited to 1% either way from the mean. The mean diameters of rim are 2.4m.Design and draw two views of flywheel.

13. Determine the dimensions of an I section connecting rod for a petrol engine from the following data: Diameter of piston=110mm, Mass of reciprocating parts=2Kg, Length of the connecting rod from centre to centre = 325 mm,Stroke length=150mm,R.P.M=1500 with possible over speed of 2500, Compression ratio=4:1, Maximum explosion pressure=2.5 N.

14. The turning moment diagram of a multi – cylinder engine is drawn with a scale of (1mm= 1˚) on the abscissa and (1mm = 250 N-m) on the ordinate. The intercepted areas between the torque developed by the engine and the mean resisting torque of the machine, taken in order from one end are -350, +800, +600, +900, -550, +450 and -650mm². The engine is running at a mean speed of 750rpm and the coefficient of speed fluctuations is limited to 0.02. A rimmed flywheel made of grey cast iron FG 200(p= 7100 kg/m³) is provided. The spokes, hub and shaft are assumed to contribute 10% of the required moment inertia. The rim has rectangular cross section and ratio of width to thickness is 1.5. Determine the dimensions of rim.

15. Design a suitable connection rod for a petrol engine for the following details. Diameter of the piston =100 mm; Weight of reciprocating parts per cylinder =20 N; Connecting rod length =300 mm; Compression ratio =7:1; Maximum explosive pressure = 3N/mm²; Stroke = 140mm; Speed of the engine = 2000 r.p.m.

16. The following data is given for a rimmed flywheel made of grey cast iron FG 200:

 Mean radius of the rim = 1.5 m

 Thickness of rim          = 200 mm

 Width of rim  = 300 mm

 Number of spokes            = 6

 Cross sectional area of the each spoke = 10000 mm²

Speed of rotation               = 720 rpm

Calculate:

(i) The tensile stress in rim at = 30˚ and  = 0˚

(ii) The axial stress in each spoke

(iii) The mass density of cast iron FG 200 is 7100 kg/m³

For all the units of DME and other mechanical engineering subjects study materials is uploaded see right side of the page you can download whatever materials you need to study or copy and paste the following link :annaunivstudymaterials.blogspot.com
Posted by at No comments:
Labels: , , ,

ME6503-DESIGN OF MACHINE ELEMENTS ANNA UNIVERSITY QUESTIONS

ANNA UNIVERSITY CHENNAI
REGULATION 2013
ME6503-DESIGN OF MACHINE ELEMENTS
       UNIVERSITY QUESTIONS  

                                            UNIT-III
Click: DME Unit 5 Question Bank

 PART-A

1. What are the different stresses setups in a bolt due to initial tightening?

2. Why reinforcement is normally required in welded joints?

3. How is a bolt designated?

4. Why are welded joints preferred over riveted joints?

5. Differentiate with a neat sketch the fillet welds subjected to parallel loading and

transverse loading?

6. What are different types of cotter joints?

7. State the two types of eccentric welded connections.

8. What is a gib? Why is it provided in a cotter joint?

PART-B

9. The cylinder head of a steam engine is subjected to a steam pressure of 0.7 N/mm². It is held in position by means of 12 bolts. A soft copper gasket is used to make the joint leak-proof. The effective diameter of cylinder is 300 mm. Find the size of the bolts so that the stress in the bolts is not exceed 100MPa.

10. A plate of 200mm width is welded to a vertical plate by fillet welding on three sides to form a cantilever with an overlap of 150mm and overhang of 400mm. A vertical downward load of 35kN is applied at free end for a weld stress of 75 N/mm². Determine the size of the weld.

11. A steam engine cylinder has an effective diameter of 350mm and the maximum steam pressure acting on the cylinder cover is 1.25 N/mm². Calculate the number and size of studs required to fix the cylinder cover. Assume the permissible stress in the studs to be 70 N/mm².

12. A bracket is welded to the vertical plate by mean of two fillet welds as shown in figure. Determine the size of the welds, if the permissible shear stress is limited to 70 N/mm².

13. A cast iron cylinder head is fastened to a cylinder of 500 mm bore with 8stud bolts. The maximum pressure inside the cylinder is 2MPa. The stiffness of part is thrice the stiffness of the bolt. What should be the initial tightening load so that the point is leak proof at maximum pressure? Also choose a suitable bolt for the above application.

14. (i) What is an eccentric loaded welded joint? Discuss the procedure for designing such a joint.

(ii) A 50mm diameter solid shaft is welded to a flat plate as shown in figure. If the size of the weld is 15mm, find the maximum normal and shear stress in the weld.

15. For supporting the traveling crane in a workshop the brackets are fixed on steel columns as shown in figure. The maximum load that comes on the bracket is 12 kN acting vertically at a distance of 400 mm from the face of the column. The vertical face of the bracket is secure dto a column by four bolts in two rows (two in each row) at a distance of 50 mm from the lower edge of the bracket. Determine the size of the bolt material is 84 Mpa. Also find the cross section of the arm of the bracket which is rectangular. 
16. Find the maximum shear stress induced in the weld of 6 mm size when a channel as shown in figure , is welded to a plate and loaded with 20 kN force at a distance of 200 mm.

For all units of DME and other mechanical engineering subjects study materials is uploaded see right side of the page you can download whatever materials you need to study or copy and paste the following link :annaunivstudymaterials.blogspot.com
Posted by at No comments:
Labels: , , , ,

ME6503-DESIGN OF MACHINE ELEMENTS PREVIOUS QUESTIONS

ANNA UNIVERSITY CHENNAI
REGULATION 2013
ME6503-DESIGN OF MACHINE ELEMENTS
                                 UNIVERSITY QUESTIONS 
                                                                                                                                                                                                                                    Click: DME Unit 1 Question Bank
Click: DME Unit 5 Question Bank

 UNIT-2                                                                                                                                                       TWO MARKS
1. On what basis are shafts designed?

2. What are the effects of introducing keyways in shafts?

3. What is the use of register in a flange coupling?

4. How is the strength of a shaft affected by the Keyway?

5. What are the various stresses induced in the shafts?

6. Name any two of the rigid coupling.

7. A shaft of 70mm long is subjected to shear of 40 MPa and has an angle of twist equal to 0.017 radian.Determine the diameter of the shaft. Take G = 80 GPa.

8. What is the main use of woodruff keys?

9. Why a hollow shaft has greater strength and stiffness than solid shaft of equal weight?

10. Under what circumstances flexible couplings are used?

11. What are the various stresses induced in the shafts?

12. Name the two of the rigid coupling.

13. What is the difference between rigid and flexible coupling?

14. Classify keys with its applications.

15. Write the advantages of the knuckle joints.

16. State Castiglione's theorem.

Click: DME Unit 5 Question Bank

 16 MARKS

1. A hollow transmission shaft having inside diameter 0.6times the outside diameter is made of plain carbon steel 40C8 and the factor of safety is 3. A belt pulley, 1000mm in diameter, is mounted on the shaft which overhangs the left hand bearing by 250mm.The belts are vertical and transmit power to the machine shaft below is 3kN and 1 kN respectively, while the weight of the pulley is 500N. The angle of wrap of the belt on the pulley is 180o. Calculate the outside and inside diameter of the shaft.

2. The layout of a shaft carrying two pulleys 1 and 2, and supported on two bearings A and B is shown in figure. The shaft transmits 7.5 k W power at 360 rpm from pulley 1 to pulley 2. The diameters of pulley 1 and 2 are 250 mm and 500 mm respectively. The masses of pulley 1 and 2 are 10 and 30 kg respectively. The belt tensions act vertically downward and ratio of belt tensions on the tight side to slack side for each pulley are 2.5:1. The shaft is made of plain carbon steel 40 C8 (Syt) = 380 N / mm2) and the factor of safety is 3. Estimate suitable diameter of shaft. If the permissible angel of twist is 0.5° per meter length, calculate the shaft diameter on the basis of tensional rigidity. Assume G = 79300 N / mm2

3. A steel solid shaft transmitting 15 kW at 200 rpm is supported on two bearings 750 mm apart and has two gears keyed to it. The pinion having 30 teethes of 5mm module is located 100mm to the left of the right hand bearings and delivers power horizontally to the right. The gear having 100 teeths of 5 mm module is located 150 mm to the right of the left hand bearing and receives power in a vertical direction from below. Using an allowable stress of 54 MPa in shear. Determine the diameter of the shaft.

4. A steel solid shaft transmitting 15 kW at 200 rpm is supported on two bearings 750 mm apart and has two gears keyed to it. The pinion having 30 teeths of 5mm module is located 100mm to the left of the right hand bearings and delivers power horizontally to the right. The gear having 100 teeths of 5 mm module is located 150 mm to the right of the left hand bearing and receives power in a vertical direction from below. Using an allowable stress of 54 MPa in shear. Determine the diameter of the shaft.

5. A horizontal nickel steel shaft rests on two bearings, A at the left and B at the right end and carrier two gears C and D located at distance of 250 mm and 400 mm respectively from the centre line of the left and right bearings. The pitch diameter of the gear C is 600 mm and that of gear D is 200 mm. The distance between the centre line of the bearing is 2400 mm. The shaft transmits 20kW at 120 rpm. The power is delivered to the shaft at  gear C and is taken out at gear D in such a manner that the tooth pressure Ftc of the gear C and Ftd of the gear D act vertically downwards.
6. Find the diameter of the shaft, if the working stress is 100MPa in tension and 56 MPa in shear. The gear C and D weights 950 N and 350 N respectively. The combined shock and fatigue factors for bending and torsion maybe taken as 1.5 and 1.2 respectively.

7. A hollow shaft for a rotary compressor is to be designed to transmit a maximum torque of 3500 N-m. The shear stress in the shaft is limited to 50Mpa.Determine inside and outside diameter of the shaft, if the ratio of inside and outside diameter is 0.4.

8. A hoisting drum 0.5 m in diameter is keyed to a shaft which is supported in two bearings and driven through a 12:1 reduction ratio by an electric motor. Determine the power of the driving motor, if the maximum load of 8 kN is hoisted at a speed of 50 m/min and the efficiency of the drive is 80%. Also determine the torque on the drum shaft and the speed of the motor in rpm. Determine also the diameter of the shaft made of machinery steel, the working stresses of which are 155 MPa in tension and 50 MPa in shear. The drive gear whose diameter is 450 mm is mounted at the end of the shaft such that it overhangs the nearest bearing by 150 mm . The combined shock and fatigue for bending and torsion may be taken as 2 and 1.5 respectively

9. A rigid type of coupling is used to connect two shafts transmitting 15kW at 200 rpm. The shaft keys and bolts are made of C45 steel and the coupling is cast iron. Design the coupling.

10. A turbine shaft transmits 500kw at 900 rpm. The permissible shear stress is 80 N/mm^2 while twist is limited to 0.5 degree in a length of 2.5 m. calculate the diameter of the shaft. take G=0.8 *105 N/mm2. if the shaft chosen as hollow with d3/d03 = 0.6. Calculate the percentage of saving in material.

11. Determine the dimension of flange coupling that connects a motor and a pump shaft. The power to be transmitted a 2 kW at a shaft speed of 960 rpm. Select suitable materials for the parts of the coupling and list the dimensions.

12. Design a muff coupling to connect two steel shafts transmitting 25 kW power at 360 rpm. The shafts and key are made of plain carbon steel 30C8.The sleeve is made of grey cast iron FG 200.The factor of safety is the shaft and key is 4.Foe example the sleeve ,the factor of safety is 6 based ultimate strength.

13. Determine the dimension of flange coupling that connects a motor and the pump shaft. The power to be transmitted a 2kW at a shaft speed 960 rpm. Select suitable materials for the parts of the coupling and the dimensions.

14. A hoisting drum 0.5 m in diameter is keyed to a shaft which is supported in two bearings and driven through a 12:1 reduction ratio by an electric motor. Determine the power of the driving motor, if the maximum load of 8 kN is hoisted at a speed of 50 m/min and the efficiency of the drive is 80%. Also determine the torque on the drum shaft and the speed of the motor in rpm. Determine also the diameter of the shaft made of machinery steel, the working stresses of which are 155 MPa in tension and 50 MPa in shear. The drive gear whose diameter is 450 mm is mounted at the end of the shaft such that it overhangs the nearest bearing by 150 mm. The combined shock and fatigue for bending and torsion may be taken as 2 and 1.5 respectively

15. Design a bushed-pin type of flexible coupling to connect a pump shaft to a motor shaft transmitting 32kW at 960 rpm. The overall torque is 20% more than mean torque. The material properties are as follows:
(i) The allowable shear and crushing stress for shaft and key material is 40 MPa and 8-MPa respectively.(ii) The allowable shear stress for cast iron is 15 MPa(iii) The allowable bearing pressure for rubber is 0.8 N/mm2(iv) The material of the pin is same as that of shafts and key.Draw neat sketch of the coupling.

16. Design a protective type flange coupling to connect two shafts to transmit 15kW at 600 rpm.
Posted by at No comments:
Labels: , , , ,

Friday, 6 November 2015

ME6502 Heat and Mass Transfer question bank



                                                 
Here Part-A (2 marks) important questions repetedly asking from the anna university chennai, which is given for 2 units namely conduction and convection. If you study well these mentionaed questions surely you can get 6-8 marks in university examinations. Make it for your reference and use for any subject study materials in this website.
Anna University, Chennai
Regulation 2013
Department of Mechanical Engineering


     Click: Unit II Convection 2 Marks with Answers

Click:Unit III Phase change Heat Transfer and Heat exchangers 2 Marks with Answers   

 Click: Unit IV Radiation 2 Marks with Answers

Click: Unit V Mass Transfer 2 Marks with Answers
   
                                           PART-A

                                     UNIT- 1   CONDUCTION

1. State Fourier's law of heat conduction.
2. What is lumped heat analysis? When is it used?
3. Define fin efficiency and fin effectiveness?
4. What do you understand by  critical radius of insulation and give it's expression.
5. Write down the three dimensional steady state equation for cartesian and Polar coordintes.
6. Write down the equation for heat transfer through composite pipes or cylinder.
7. Define overall heat transfer coefficient.
8. State the applications of fins and give it's types.
9. Define Biot number. And give it's significance.
10. What are Heisler charts?
11. Define thermal conductivity and What are the factors affecting it?
12. What is fourier number and give it's significance. 
Click: Unit I Conduction 2 Marks with Answers


                                        UNIT- 2  CONVECTION

1. What are hydro dynamic and thermal boundary layer thickness?
2. What is meant by natural and forced convection?
3. State Newton' s law of convection.
4. What are the dimensionless parameters used in forced convection?
5. Define boundary layer thickness.
6. Indicate the concepts or significance of boundary layer.
7. Define convection and write it's types.
8. Draw the velocity and temperature profiles for free convection on a hot vertical plate.
9. Define Prandl number and Grashoff number with its significance.
10. Define Reynolds number and Nusselt number with its significance.
11. Differentiate laminar and turbulent flow.
12. In which mode of heat transfer is the convection heat transfer coefficient usually higher. Why? 

Click: DME previous 5 years Anna University Questions


Click: Unit II Convection 2 Marks with Answers

Click:Unit III Phase change Heat Transfer and Heat exchangers 2 Marks with Answers

Click: Unit IV Radiation 2 Marks with Answers

For all the units of heat and mass transfer and other mechanical engineering subjects study materials such as university questions with answers, question bank, lecture notes in PPT, PDF and previous years anna university questions were uploaded in this website. See the right page of this page you can download more for your reference or go to annaunivstudymaterials.blogspot.com
Posted by at No comments:
Labels: , , , , ,

Thursday, 5 November 2015

Thermodynamics important questions bank

 This post help you for the mechanical engineering student who is going to write thermodynamics exam.Here important repeated 2 marks and 16 marks of unit 1 is given. 
Anna University Chennai
Regulation 2013
                                     Thermodynamics                 

                                               UNIT-5   Part - A

                                      Answer all the questions             

 1. Define degree of saturation. 

 2. Differentiate absolute humidity and relative humidity.

 3. Define dew point depression.

 4. What is meant by adiabatic saturation temperature?

 5. What is psychrometer? 

 6.What is humidification and dehumidification?

 7. Define sensible heat and latent heat.

 8. What are the important psychrometric processes?

 9. State Helmholtz function.

 10. What are the assumptions made in Vanderwaal’s equation of state? 
                                                  Part - B                 

1. 30 m3/ min of moist air at 15 C DBT and 13 C WBT are mixed with 12m3/min of moist air at 25 C DBT and 18 C WBT. Determine DBT and WBT of the mixture assuming the barometric pressure is one atmosphere. 

2.For the atmospheric air at room temperature of 30 C and relative humidity of 60% Determine partial pressure of air, humidity ratio, dew point temperature, density and enthalpy of mixture.


3. Atmospheric air at 1.0132 bar has a DBT of 32◦C and a WBT of 26◦C. Find (i) the partial pressure of water vapour (ii)the specific humidity (iii) the dew point temperature (iv) the relative humidity (v) the degree of saturation (vi)the density of the air in the mixture (vii) the density of the vapour in the mixture (viii) the enthalpy of the mixture. 


4. One kg of ice at -5 C is exposed to atmosphere which is at 20 C. The ice melts and comes into contact into thermal equilibrium with the atmosphere. (i)  Determine the entropy increase of the universe. (ii) What is the minimum amount of work necessary to convert the water back into ice at -5 C? Cp of ice is 2.093 kJ / kg K and the latent heat of fusion of ice.


5.A sample of moist air at 1 atm and 25 C has a moisture content of 0.01% by volume. Determine  the  humidity  ratio,  the  partial  pressure  of  water  vapour,  the  degree  of saturation, the relative humidity and the dew point temperature.


6. Air at 20 C, 40% R.H is mixed with air at 40 C, 40% R.H in the ratio of (former) 1:2 (later) on dry basis. Determine the final condition of air.


7. One kg of air at 40 C dry bulb temperature and 50% relative humidity is mixed with 2 kg of air at 20 C dry bulb temperature and 20 C dew point temperature. Calculate the temperature and specific humidity of the mixture. 


8.  Determine the rate of power loss due to irreversibility in a heat engine operating between temperatures of 1800 K and 300 K. Engine delivers 2 MW of power when heat is added at the rate of 5 MW. 


9. An air-water vapour mixture enters an air- conditioning unit at a pressure of 1.0 bar, 38 C DBT, and a relative humidity of 75%. The mass of dry air entering is 1 kg/s. The air- vapour mixture leaves the air-conditioning unit at 1.0 bar, 18 C, 85% relative humidity. The moisture condensed leaves at 18 C. Determine the heat transfer rate for the process. 


10. Atmospheric air at 1.0132 bar has 20 C DBT and 65% RH. Find the humidity ratio, wet bulb temperature, dew point temperature, degree of saturation, enthalpy of the mixture, and density of air and density of vapour in the mixture. 


11. In a laboratory test, a sling psychrometer recorded dry bulb and wet bulb temperatures as 303 K and 298 K respectively. Calculate (i) vapour pressure (ii) relative humidity (iii) specific humidity (iv)Degree of saturation (v) dew point temperature (vi) enthalpy of the mixture. 


12.1 kg of air at 40 C DBT and 50% relative humidity is mixed with 2 kg of air at 20 C DBT and 20 C dew point temperature. Calculate the specific humidity, enthalpy and the dry bulb temperature of the mixture.


Posted by at No comments:
Labels: , , , , ,

Sunday, 1 November 2015

GE6152 Engineering Graphics university questions

This post covers the repeated questions of Engineeering Graphics asking from the Anna University, Chennai. If you draw the following questions surely you will get good marks in university exams.


All subjects question banks, Lecture notes, PPT, university questions, Question bank, unit wise 2 marks and 16 marks can be downloaded from the link : 

Copy and paste the following site:   annaunivstudymaterials.blogspot.com





Semester & Branch: I & ALL BRANCH 

Subject Name          : ENGINEERING GRAPHICS  

Subject Code          : GE 6152 



1 (a). A regular pentagon of 30 mm side is resting on one of it’s edges on H.P, which is   inclined at 30º to H.P. It’s surface is inclined at 45º to VP. Draw its projections.    


2. A circular lamina of 60 mm diameter is resting on VP on one of its circumference point such that the surface is 40º inclined to V.P. Draw the projections of the lamina if  the diagonal passing through the point on which it is resting is making 50º with H.P. 


3.A pentagonal prism, side of base 25 mm side and axis 55 mm long, rests with one of its shorter edges on HP such that the base containing that edge makes an angle of 30° to HP and its axis is parallel to VP. Draw its projections. 


4. A cylinder of base diameter 60 mm and height 80 mm is resting on HP in one of its generators with its axis inclined at 50° to VP. Draw its projections.  



5.A hexagonal pyramid of base 25 mm and axis 60 mm long is freely suspended from a corner of the base. Draw the projections. 


6.A cone of 50 mm diameter and 70 mm height rests on the ground on one of its base circle point such that the apex is 20 mm and the nearest base circle point is 50 mm infront of VP and the base is perpendicular to HP. Draw the projections.


7.Mark the projection of the following points on a common reference line, keeping the projectors 35mm apart.

i)   A, 35mm above HP and 25mm in front of VP

ii)  B, 40mm below HP and 15mm behind VP

iii) C, 50mm above HP and 25mm behind VP

iv) D, 45mm below HP and 25mm behind VP

v)  E, 30mm behind VP and on HP                                                  

                            

8.Construct an involute of circle of diameter 30mm. Draw the tangent and normal to the curve
                                                                                                                                                                                                                                                            

9.Draw the locus of a curve traced by a point, when the distance of the focus from the directrix is equal to 35mm and eccentricity is 1. Also draw the tangent and normal to the curve at any point on the curve.                                                                        

10. A circle of 50mm diameter rolls along a line. A point on the circumference of the circle is in contact with the line in the beginning and the after one complete revolution. Draw the path traced by a point on the circumference of the circle. Also draw a tangent and normal to the generated curve.

                                                                                                                                                                            

12. The top view of a 75 mm long line AB measures 65 mm, while the length of its front view is 50 mm. It’s one end A is in the HP & 12 mm in front of VP. Draw the projections of the line & determine its inclinations with HP & VP.



13.A square lamina ABCD 40 mm side rests on one of its corner on ground. The plane is inclined at an angle of 30° to the ground and diagonal DB, in plan inclined at 45° to the VP and parallel to the HP. Draw its projections.   
                                             

14. A regular pentagon of 30 mm side is resting on one of it’s edges on H.P, which is inclined at 30º to H.P. It’s surface is inclined at 45º to VP. Draw its projections.  

15.   A cone of 50 mm diameter and 70 mm height rests on the ground on one of its base circle point such that the apex is 20 mm and the nearest base circle point is 50 mm in front of VP and the base is perpendicular to HP. Draw the projections.


16. A cylinder of base diameter 60 mm and height 80 mm is resting on HP in one of its generators with its axis inclined at 50° to VP. Draw its projections. 

17. A hexagonal pyramid of base 25 mm and axis 60 mm long is freely suspended from a corner of the base. Draw the projections. 

18. A pentagonal prism, side of base 25 mm side and axis 55 mm long, rests with one of its shorter edges on HP such that the base containing that edge makes an angle of 30° to HP and its axis is parallel to VP. Draw its projections 







All subjects question banks, hand written notes, PPT, university questions can be downloaded from the link : 

Copy and paste the following site:   annaunivstudymaterials.blogspot.com









Posted by at No comments:
Labels: , , , ,
Subscribe to: Posts (Atom)