machine design -ii - solutiongeek.in filebmel314 . g. h. raisoni college of engineering, nagpur (an...

BMEL314 G H Raisoni College of Engineering Nagpur

(An Autonomous Institute) Sixth Semester B E (Mechanical Engineering)

Vacation Examination Summer - 2017

Machine Design -II Time 3 hrs] [Max Marks 60 Instructions to Candidate

1) [CO-lICO-2CO-3 ] at the beginning of questionsub-question indicates the course outcome related to the question

2) All questions carry marks as indicated 3) Assume suitable data wherever necessary 4) Use of design data book is permitted

1 (a) [CO-I] Define flywheel amp give the various application of it 2

(b) [CO-2] Give the classification of bearing 2

(c) [CO-3] Explain in briefcharacteristic of belt drives 2

(d) [CO-4] Give the classification of gears 2

(e) [CO-5] Define the following terms used in worm gearing 2 i) Lead angle ii) Helix angle

(f) [CO-6] Discuss selection of motors for various applications 2

2 [CO-I] A flange coupling connects two 50 mm diameter length of commercial shafting The 10 shafts are made of SAE 1030 steel as also the bolts The flanges are made of cast iron Design the flange coupling for the same torque capacity as of the shaft

3 [CO-2] Select a single row deep groove ball bearing for a radial load of 4000 N and an axial 8 load of 5000 N operating at a speed of 1600 rpm for an average life of 5 years at 10 hours per day Assume uniform and steady load

4 [CO-3] A centrifugal pump is to be drive at 1500 rpm by four stroke diesel engine of75 kWat 10 1000 rpm through a leather belt The flywheel of the engine is to be used as the driving pulley The center line of the belt drive make an angle of 50deg with horizontal Suggest suitable size of belt and center distance of the drive

5 [CO-6] An electric hoist is being designed for lifting capacity of 30 kN at 80 mmin The rope IO drum diameter will be 600 mm and it will be driven by an electric motor running at 1440 rpm through the spur gears Suggest suitable no of stages for reduction drive and the velocity ratio in each stage Design the gears for continuous duty Design first stage gears only

6 (a) [CO-4] Helical gear speed reducer is to be used with an 1800 rpm electric motor and a 450 rpm 10 load which involves a moderate amount of shock The 24 tooth pinion has a normal module of 3 mm The face width of 40 mm The normal pressure angle of 20deg and helix angle of 23deg (App haulness 262 Bhn) both gears are made on SAE 2320 steel with case hardening Estimate the power that can be transmitted by the reducer for continuous duty Will the heat treatment be sufficient from wear point of view

OR (b) [CO-51 Design a pair of straight teeth cast iron bevel gears to transmit 90 kw from a shaft 10

running at 235 rpm to another running at 75 rpm Check for continuous operation Assume steady load



Vacation Examination Summer-2017

Energy Conversion-II Time 3 hrs] [Max Marks 60 Instruction to Candidates

1) [CO-IICO-2CO-3 ] at the beginning of questionsub-question indicates the course outcome related to the question

2) All questions carry marks as indicated 3) Assume suitable data wherever necessary 4) Due credit will be given to neatness and adequate dimensions 5) Illustrate your answer wherever necessary with the help of neat sketches 6) Use of non-programmable calculator is permitted

1 (a) [CO-2] Draw the neat sketch ofa va~e type compressor 2

(b) [CO-3] How IC engines are classified 2

(c) [C0-3] How pre-ignition and detonation is defined in context with SI engines 2

(d) [CO-5] State difference between open cycle and closed cycle gas turbine 2

(e) [CO-6] What is moist and saturated air 2

(f) [CO-6] Define I tonne of refrigeration 2

2 [CO-l] A singe acting two stage compressor with complete inter-cooling deliver 6 8 kgmin of air at 16 bar Assuming an intake at I bar and 15degC and compression and expansion with the law pvl3= C determine [i] power if N= 420 rpm [ii] isothermal efficiency [iii] FAD per second [iv] if clearance ratio for LP and HP cylinder are 004 and 006 Calculate volumetric efficiency and swept volume for each cylinder [v] net heat transfer in LP and HP cylinder during compression and in the intercooler R= 0287 kJkg-K Cv =071 kJkg-K

3 (a) [CO-I] Discuss the following term in relation to reciprocating compressor 4 i Free air delivered

ii Volumetric efficiency

(b) [CO-2] Describe with neat sketch the working of a roots blower 4

4 (a) [CO-3] Explain carburetion and fuel injection process in detail 4

(b) [CO-3] [CO-3]

) State the necessity of cooling of an IC engine ii State the difference between Sl and CI engine

4

5 [CO-4] The power output of 6 cylinder four stroke engine is observed by a water brake 8 dynamometer for which the law of brake power = WN2000 k W Where W=load in Newton and N is speed of engine in rpm The air consumption is measured by air box method equipped with a sharp edge orifice system The following readings were obtained Orifice diameter- 30 mm Cylinder bore = 100 mm Cylinder stroke = 120 mm Brake load = 560 N Atmospheric pressure= 1 bar Carbon hydrogen percentage by mass =83 17 Pressure drop across orifice = 145 cm ofHg

----------------

-------

~bull

bull

6 [CO-5]

Coefficient ofdischarge oforifice 06 Ambient air temperature 27degC Fuel density 831kglm3

Time taken for 100 cc fuel consumption =20 sec Speed of engine 2400 rpm Determine I Brake power 2brake specific fuel consumption 3percentage of excess air supplied

The compressor and turbine unit of a small gas turbine plant have an isentropic 8 efficiency of 85 The inlet air temperature to the compressor is 15QC and the maximum temperature during the cycle is limited to 700degC and pressure ratio is 4 Determine the specific output and overall thermal efficiency of a cycle Neglect all losses Assume Cpa =Cps == 1005 kjkg-k

Ratio ofspecific heat ofair and gas =14

7 (a) [CO-6]

(b) [CO-6]

Discuss the following terms 4 1 Specific humidity

ii Wet bulb depression

A standard vapor compression refrigerator using R-12 as the refrigerant operates 4 between the condenser pressure of lObar and evaporator pressure of 15 bar The evaporator absorbs 75 kJmin of energy as heat and the vapor is dry saturated at exit from the compressor Calculate

i Flow rate of refrigerant ii COP of the cycle

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wbull wbull

= ~-


(An Autonomous Institute) Fourth Term Sixth Semester B E (Mechanical Engineering)


Industrial Engineering Time 3 hrS] [Max Marks 60 Instruction to Candidates

1) [CO-lICO-2CO-3 ] at the beginning of questionlsub-question indicates the course outcome related to the question

2) All questions carry marks as indicated 3) Assume suitable data wherever necessary 4) Due credit will be given to neatness and adequate dimensions 5) Illustrate your answer wherever necessary with the help of neat sketches

1 (a) [CO-2] The lunch time of the worker will be considered as allowance in work -- shymeasurement

2

(b) (CO-2] Enumerate two examples of the contingency allowance 2

(c) [CO-3] In ___ organization the line heads are assisted by specialist staff 2

(d) [CO-4] An anthropometric data related to standing posture will be required to design the benches of students in class True I False

2

(e) [CO-5] Time period considered for Short term sales forecasting method is less than 2

(f) [CO-6] As per JIT manufacturing Is Overproduction considered as one of the seven walttes YesJNo

2

2 (a) [CO-I] Clarify the difference between Production and Productivity 2

(b) [CO-I] Sketch the operation process chart for drilling two holes of different diameters in a square MS Plate In the chart specify the details of the drilling process that you have assumed

6

3 [CO-2] Mis Sun Welding Shop has following elements recorded during welding cycle The stop watch data (minutes) is continuous as given below Assuming the rest allowance as 13 and contingency allowance of 2 Calculate the rest allowance contingency allowance and standard time for this welding cycle

8

Element Description Observations Rating

()I 2 3 4 5

1 Pick and place

On mlc amp welding rod approach

030 248 679 1074 1311

1326

90

2 045 264 696 1089 110

3 Welding 195

203

424

431

836

845

1259

1267

1466

1473

110

4 Withdraw rod stop mlc 110

5 Release weld rod and place 220 449 864 1282 1489 95 Note ElementS Observation No2 Foreign element 449 to 669 ElementS Observation No3 Foreign element 864 to 1084

--=

4 [CO-3J Enumerate various organization structures amp explain anyone in detail 8 -5 [CO-4J As per Ergonomics discuss important aspects of man-machine systems with neat

sketches where necessary shy8

l1li 6 (a) [C0-5] Discuss Gantt Chart in detail with example and specify its limitations 8

OR (b) [CO-5] MIs Konark company manufacturing washing machines establishes a fact that there is 8

a relationship between sale of washing machines and popUlation ofthe city The mk hd aJhtUfar et researc came out reve s teo ow1Og 10 ormatIon

l1li Fit a linear regression equation and estimate the demand for washing machines for a city with a population of45 million

7 [CO-6] Specify the difference between Value Analysis and Value Engineering Construct the 8 FAST (FWlction Analysis Systems Technique) Diagram for a pen =

= = I = -~ -bull r

~ ~

~

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--

Population (million) 5 7 15 22 27 36 No ofwashing machines demanded in thousands) 28 40 65 80 96 130

=


(An Autonomous Institution) Fourth Term Sixth Semester B E (Mechanical Engineering)


Heat Transfer Time 3 hrs] [Max Marks 60 Instructions to Candidate

I) [CO-lCO-2CO-3 Jat the beginning of questionsub-question indicates the course outcome related to the question

2) All questions carry marks as indicated 3) Assume suitable data wherever necessary 4) Due credit will be given to neatness and adequate dimensions 5) Use Heat Transfer Data Book is allowed

1 (a) [CO-I] In which ofthe following cases molecular transmission ofheat is smallest 2 i) Solids ii) Alloys

iii) Gases iii) Liquids

(b) [CO-2] A metal ball of diameter 60 mm is initially at 220degC The ball is suddenly Cooled by an 2 air jet of 20degC The heat transfer coefficient is 200 Wm2K The specific heat thermal conductivity and density of the metal ball are 400 JkgK 400 WmK and 9000 m3kg respectively The ball temperature (in 0c) after 90 seconds will be ___

(c) [CO-3] A dimensionless number which is a ratio of kinematic viscosity to thermal diffusivity is 2 known as number

(d) [C0-4] The free convection heat transfer is~ignificantly affected by shyi) Reynolds number ii) Grashoff number iii) PrandIt number iv) Stanton number

(e) [CO-5] The emmisive power of a black body is P If its absolute temperature is doubled The 2 emmisive power becomes __ times P

(t) [CO-6] In a counter flow heat exchanger water is heated at a rate of 15 kgs from 40degC to 80degC 2 by oil entering at 120degC and leaving at 60degC The logarithmic mean temperature difference ---- shy

2 (a) [CO-I] Calculate the rate of heat flow per unit area through a furnace wall consisting of200 mm 6 thick inner layer of chrome brick a center layer of kaolin brick 100 mm thick and an outer layer of masonary brick 100 mm thick The unit surface conductance at the inner surface is 74 Wm2K and the outer surface temperature is 70degC The temperature of the gases inside the furnace is 1670 DC Also calculate the temperatures along both surfaces of the central layer Take thennal conductivities of chrome kaolin and masonary brick as 125 0074 and 0555 WmK respectively

OR

(b) [CO-I] A steam pipe of 170 mm OD and 160 mm LD is covered with two layers of insulation 6 The thickness of the ftrst layer is 30 rom and that of second layer is 50 mm The thermal conductivivties of the pipe and insulating layers are 58 0175 and 0093 Wmk respectively The temperatures of steam and inner surface of steam p~e are 350degC The surface coefficients for inside and outside surfaces are 230 Wm K and 7 WmlK respectively Calculate the heat loss per metre length of steam pipe and layer contact temperatures Ambient temperature is 30degC

(c) [CO-I] What is critical radius of insulation 2

--

1 (a) [CO-2] Aluminium square fins 1 cm long are provided on the surface of an electronic device to 4 -= carry 1 W of energy generated by the device The temperature at the surface of the device should not exceed 80degC The temperature of the surrounding medium is 40DC If thermal conductivity of aluminium is 200 WmK and heat transfer coefficient on the surface of the fins is 15 WIm2K find the number of fins required to carry out the abovemiddot duty The cross-section of the fins is 05 mm x 05 mm The heat loss from the end of = the fins may be neglected -(b) [CO-2] Explain the Newtonian law of heating I cooling Discuss the lumped heat capacity 4

analysis -shy4 (a) [C0-3] Explain the physical significance of the following dimensionless numbers (i) Prandlt 3 shy

Number (ii) Nusselt Number (iii) GrashoffNumber -(b) [CO-3] When 05 kg of water per minute is passed through a tube of20 mm diameter it is found 5

to be heated from 20DC to 50degC The heating is accomplished by condensing steam on the surface of tube The surface temperature of tube is maintained at 85degC Determine = the length of tube required for fully developed flow

S (a) [CO-4] A nuclear reactor with its core constructed of parallel vertical plates 22 m high and 14 5 = m wide has been designed on free convection heating of liquid bismuth The maximum

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temperature of the plate surface is limited to 960degC while the lowest allowable -temperature of bismuth is 340DC Calculate the maximum possible heat dissipation from both sides ofeach plate shy

(b) [CO-4] Explain with neat sketch the temperature and velocity profiles in free convection on a 3 -shyvertical wall when the wall is at a higher temperature than surrounding

6 (a) [C0-5] Explain the term radiation shield with applications 4 = (b) [CO-51 Assuming the sun (diameter =14 x 109 m) as a black body having a surface temperature 4 -shy

of 5750 K and at a mean distance of 15 x 1010 m from the earth (diameter = 128 x 106m) estimate the following (i) total-energy emitted by sun -(ii)The emmision received per m2 outside the earths atmosphere (iii)The total energy received by the earth if no radiation is blocked by the atmosphere of -earth -

7 (a) [C0-6] A counter flow tube in tube heat exchanger is used to cool the engine lubricating oil for 6 a large industrial gas turbine engine The flow rate of cooling water through the inner shyshytube (di =20 mm)ismiddot018 kgIs while the flow rate of oil through the outer annulus (do = 40 mm) is 012 kgls the inlet and outlet temperatures of oil are 95degC and 65degC ~

-

respectively The water enters at 30degC to the exchanger Neglecting the tube wall thermal ~ resistance fouling factors and heat loss to surroundings calculate the length oftube

(b) [C0-6] Explain the term number of transfer units State its advantages over LMTD method 2 -shy-~ ---E

--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-

Which type ofwater turbine can develop maximum power from a single unit Justify your answer

2

The brake thermal efficiency ofa diesel engine is 2636The calorific value ofthe fuel is 45100 kJkg The brake specific fuel consumption will be ---------shy(a)0251 kglkWh (b) 03027 kglkWh (c)05 kglkWh (d) 23 kglkWh

2

Which one ofthe following equipment prevents the boiler against excessive pressure Justify (a) Pressure gauge (b) Steam stop valve (c) Fusible plug (d) Safety valve

2

Why as the load factor decrease the cost ofelectricity per kwh (a) decreases (b) increases (c) remains the same (d) does not depend on load factor

2

In measurement of oxygen using paramagnetic analyser which gas has very high magnetic permanence and why (a)Helium (b) Hydrogen (c) oxygen (d) Carbon dioxide

2

Why there is a need of absorbing some neutrons in reactor 2

Give the functions and materials for the following (i)Reflector (ii) Control rods (iii) Biological shield

6

Give the construction and working of a Gas cooled reactor State its advantages and disadvantages

4

Discuss a unit hydrograph and its limitation 4

At a particular site ofa river the mean monthly discharge for 12 months is tabulated below

6

Discharge (millions of Month Month Discharge (millions I m3 per month) of m3 per month)

April 300 1500Oct May 120 Nov 790 June 780 Dec 790 July 1300 Jan 580 Aug 1700 Feb 450I

1400I Sep Mar I 350

(i) Draw hydro graph for the given discharges and find the average monthly flow

(ii) Also draw the flow duration curve

(iii) The power available at mean flow of water if available head is 90 meters at the site and overall efficiency of the generation is 84 Take 30 days in a month

BMEL307

G H Raisoni College of Engineering Nagpur (An Autonomous Institute)

Sixth Semester B E (Mechanical Engineering) Vacation Examination Summer - 2017

POWER PLANT ENGINEERING (ELECTIVE-I)

Time 3 hrs] [Max Marks 60 Instruction to Candidates


2) All questions carry marks as indicated

~ -r-- shy

4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]

Which parameters limit the power output and efficiency of diesel plant Justify

Make a layout of a modem diesel power plant showing the following system (i) Cooling system (ii) Air intake system (iii) Fuel supply system (iv) Exhaust system (v) Lubrication system

Classified the stokers How spreader stoker is worked

Classified the pulverized fuel burners Draw a neat sketch of Long flame burner and explain briefly

Describe with the help of a neat sketch dionic water purity meter

The maximum demand of a power station is 96 MW and daily load curve is described as follows

14-18 18-22 22-24 88 98 47

(i) Determine the load factor ofpower station (ii) What is the load factor of stand by equipment rated at 30MW that takes up all load in

excess of75 MW Also calculate its use factor

OR

It is proposed to supply a load with a maximum demand of 150 MW and a load factor of 05 Choice is to be made from nuclear hydro and steam power plants Calculate overall cost per kWh in each scheme

bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----

6 ---Cost Nuclear Power Plant

Hydro-power plant

Steam power plant

ClPital per kW installed Rs7500 Rs4520 Rs2360 Intrest 10 10 12 Depriciation 10 8 12 Operating costper kWh 13 paise 8paise 22 paise Transmisssion and distribution cost kWh

034 paise 086 paise 034 paise

-

--bullbullw

bullw w w -bull -----E

--------

--



Vacation Examination Summer 2017

Advance I C Engines (Elective-I) Time 3 hrs] [Max Marks 60 Instruction to Candidates

I) All questions carry marks as indicated 2) Assume suitable data wherever necessary 3) Illustrate your answer wherever necessary with the help of neat sketches

1 (a) In a four stroke cycle petrol engine the inlet valve (i) open at top dead centre and closes at bottom dead centre (ii) opens at 20deg before top dead centre and closes at 40deg after bottom dead centre (iii) open at 20deg after top dead centre and closes at 20deg before bottom dead centre

(iv) may open or close anywhere

(b) If petrol is used in a diesel engine then (i) low power will be produced

(iii) higher knocking will occur (ii) efficiency will be low (iv) black smoke will be produced

(c) A petrol engine has compression ratio from (i) 6 to 10 (ii) 10 to 15 (iii) 15 to 25 (iv) 25 to 40

(d) In a coil ignition system of petrol engines a condenser is connected across the contact breaker in order to (i) Prevent sparking across the gap between the points (ii) Cause more rapid break ofthe primary current giving a higher voltage in the Secondary circuit (iii) Both (i) and Oi) (iv) none of the above

(e) The function ofadistributor in a coil ignition system ofLe engine is (i) to distribute spark (ii) to distributes current

(iii) to generate spark (iv) to time the spark

(f) The purpose oftesting an internal combustion engine is (i) To determine the information which cannot be obtained by calculations (ii) To conform the data used in design the validity of which may be doubtful (iii) To satisfy the customer regarding the performance of the engine

(g) The firing order in an Ie engine depends upon (i) Arrangement of the cylinders

(iii) Number ofcylinders Oi) design of crankshaft

(iv) all of the above

(h) Violent sound pulsations within the cylinder of an internal combustion engine are due to (i) Detonation (ii) turbulence

(iii) pre-igniton (iv) all of the above

1

(i) Differentiate between octane and cetane number 2

(J) Differentiate between knocking and detonation 2

2 (a) The bore and stroke of a four cylinder four stroke engine are 90 mm and 100 mm respectively and 5 torque measured is 120 N-m Calculate the brake mean effective pressure

(b) Explain supercharging ofSI engine and its limitations 3

3 Attempt Any Two of the following

(a) Explain the phenomenon of detonation in CI engine 4

(b) List the methods to find out FHP Explain the Morse test 4

(c) Explain with neat sketch 4 i) Time loss factor ii) Exhaust blow down factor


(a) A 825 cm x 115 cm four cylinder four stroke cycle SI engine is to have a maximum speed of 4 3000 rpm with volumetric efficiency is 80Ifthe maximum venturi depression is to be 150 cm of water What must be the size of the venturi Also find the size of fuel orifice if A-F ratio of 141 is desired Take coefficient of discharge for air and fuel 084 and 070 and the densities for air and

bullbullbullbullbullbullbullbullbullbullbullfuel are 129 Kgm3 and 700 Kgm3

bull -(b) Explain the ther~osYPhOnic cooling system used in SI engine 4 bull (c) Differentiate between MPFI with conventional system with neat sketch 4 shy

5 (a) Explain with neat sketch the working of simple carburetor 4 shy-(b) What is combustion Explain with neat sketch the combustion stages in SI engine 4 W

6 (a) Give a brief note on how catalytic convertors help in reducing HC CO and NOx emission 4 wi (b) Explain merits and demerits of various alternative fuels used in engine 4 bull

7 (a) Explain anyone method of fuel injection system 4 shy(b) A two stroke engine CI engine develops a brake power of 368 KW while 736 KW is used to 4 bull

overcome the frictional losses It consumes 180 Kghr of fuel at an air fuel ratio 20 I The heating value of fuel is 42000 KJlkg Calculate i) Indicated power ii) Mechanical efficiency iii) Air consumption -iv) Indicated thermal efficiency v) Brake thermal efficiency shy-

BMEL318


Sixth Semester B E (Mechanical Engineering) Vacation Examination Summer 2017

Renewable Energy Sources (Elective-I) Time 3 hrs] [Max Marks 60 Instruction to Candidates I) [CO-ICO-2CO-3 ] at the beginning of questionsub-question indicates the course outcome related to the question 2) All questions carry marks as indicated 3) Due credit will be given to neatness and adequate dimensions 4) lIIustrate your answer wherever necessary with the help of neat sketches 5) Use of non-programmable calculator is permitted

1 (a) [CO-I] Define Zenith angle 2

(b) [CO-2] Explain the principle ofconversion of solar energy into heat 2

(c) [CO-3] Explain the prospects of geothermal energy in context to India 2

(d) [CO-4] What are advantages and limitation of wave energy Conversion 2

(e) [CO-5] What is difference between fuel cell and battery 2

(f) [CO-6] What will be future amount of uniform payment of Rs 600 deposited at the end of each 2 year with an interest rate of 625 per annum at the end of 5 year

2 (a) [CO-I] Calculate the angle made by the beam radiation with the normal to a flat collector 4 pointing due south located in New Delhi (280 38 N 770 17E) at 900 hour solar time on December I The collector is tilted at angle of 360 with the horizontal

(b) [CO-I] Explain solar pond with neat and labelled diagram 4

3 (a) [CO-2] Enlist different type of focussing collector Explain anyone of them 4 OR 4

(b) [CO-2] How flat plate collector can be used for water heating purpose with neat sketch 4

(c) [CO-2] Explain utilization of photon energy in solar cell Why the full spectrum of light is not 4 used in solar cell

4 (a) [CO-3] Describe horizontal axis type aerogenerator 4

(b) [CO-3] Explain momentum theory in wind power generation and also derive expression for 4 maximum power generation

5 (a) [CO-4] Find the net power and conversion efficiency of MHD generator from following data if 4 specific resistance is 01 Om Magnetic field= 6Wbm2 electrode area=12 m2 gas velocity=600ms and distance between electrode is 1m

(b) [CO-4] Explain why Deenbandhu biogas plants are now apparently more popular than Janta 4 type biogas plant in India

OR (c) [CO-4] What are techniques suggested for maintaining the biogas production Explain 4

6 (a) [CO-5] Describe closed cycle OTEC system with its advantage over open system 4

(b) [CO-5] A single basin type tidal power plant has basin area of 4 KM2 The tide has an average 4 rangemiddot of 13m Power is generated only during ebb cycle The turbine stops operating when the head on it falls below 3m Calculate power generated by plant in single emptying process of basin if turbine generated efficiency is 07Estimate annul generating of the plant

7 (a) [CO-6] What is inflation How is the effect of inflation on annual cash flow is taken care 4

(b) [CO-6] A 100 LPD domestic solar water heater saves consumption of electricity in an electric 4 geyser on 100 days of the year by heating 100 litres of water from 150 C to 60degC The estimate useful life of heater is 10 years Determine the present worth of saving through the use of solar water heater if the efficiency of electric geyser is 90 and cost of electricity is Rs 4 per KWh Assume interest rate as 12



Vacation Examination Summer-2017

Energy Conversion-II Time 3 hrs] [Max Marks 60 Instruction to Candidates


2) All questions carry marks as indicated 3) Assume suitable data wherever necessary 4) Due credit will be given to neatness and adequate dimensions 5) Illustrate your answer wherever necessary with the help of neat sketches 6) Use of non-programmable calculator is permitted

1 (a) [CO-2] Draw the neat sketch ofa va~e type compressor 2

(b) [CO-3] How IC engines are classified 2

(c) [C0-3] How pre-ignition and detonation is defined in context with SI engines 2

(d) [CO-5] State difference between open cycle and closed cycle gas turbine 2

(e) [CO-6] What is moist and saturated air 2

(f) [CO-6] Define I tonne of refrigeration 2

2 [CO-l] A singe acting two stage compressor with complete inter-cooling deliver 6 8 kgmin of air at 16 bar Assuming an intake at I bar and 15degC and compression and expansion with the law pvl3= C determine [i] power if N= 420 rpm [ii] isothermal efficiency [iii] FAD per second [iv] if clearance ratio for LP and HP cylinder are 004 and 006 Calculate volumetric efficiency and swept volume for each cylinder [v] net heat transfer in LP and HP cylinder during compression and in the intercooler R= 0287 kJkg-K Cv =071 kJkg-K

3 (a) [CO-I] Discuss the following term in relation to reciprocating compressor 4 i Free air delivered

ii Volumetric efficiency

(b) [CO-2] Describe with neat sketch the working of a roots blower 4

4 (a) [CO-3] Explain carburetion and fuel injection process in detail 4

(b) [CO-3] [CO-3]

) State the necessity of cooling of an IC engine ii State the difference between Sl and CI engine

4

5 [CO-4] The power output of 6 cylinder four stroke engine is observed by a water brake 8 dynamometer for which the law of brake power = WN2000 k W Where W=load in Newton and N is speed of engine in rpm The air consumption is measured by air box method equipped with a sharp edge orifice system The following readings were obtained Orifice diameter- 30 mm Cylinder bore = 100 mm Cylinder stroke = 120 mm Brake load = 560 N Atmospheric pressure= 1 bar Carbon hydrogen percentage by mass =83 17 Pressure drop across orifice = 145 cm ofHg

----------------

-------

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bull

6 [CO-5]





7 (a) [CO-6]

(b) [CO-6]





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wbull wbull

= ~-








2




2



2



6


8


()I 2 3 4 5

1 Pick and place


030 248 679 1074 1311

1326

90

2 045 264 696 1089 110

3 Welding 195

203

424

431

836

845

1259

1267

1466

1473

110



--=








= = I = -~ -bull r

~ ~

~

~

--


=















OR



--






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-



--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-


2


2


2


2


2



6


4



6



1400I Sep Mar I 350




BMEL307







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4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


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4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



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--------

--




















1

















BMEL318
























----------------

-------

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bull

6 [CO-5]





7 (a) [CO-6]

(b) [CO-6]





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wbull wbull

= ~-








2




2



2



6


8


()I 2 3 4 5

1 Pick and place


030 248 679 1074 1311

1326

90

2 045 264 696 1089 110

3 Welding 195

203

424

431

836

845

1259

1267

1466

1473

110



--=








= = I = -~ -bull r

~ ~

~

~

--


=















OR



--






IIgt






-



--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-


2


2


2


2


2



6


4



6



1400I Sep Mar I 350




BMEL307







~ -r-- shy

4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



-

--bullbullw


--------

--




















1

















BMEL318































2




2



2



6


8


()I 2 3 4 5

1 Pick and place


030 248 679 1074 1311

1326

90

2 045 264 696 1089 110

3 Welding 195

203

424

431

836

845

1259

1267

1466

1473

110



--=








= = I = -~ -bull r

~ ~

~

~

--


=















OR



--






IIgt






-



--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-


2


2


2


2


2



6


4



6



1400I Sep Mar I 350




BMEL307







~ -r-- shy

4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



-

--bullbullw


--------

--




















1

















BMEL318
























--=








= = I = -~ -bull r

~ ~

~

~

--


=















OR



--






IIgt






-



--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-


2


2


2


2


2



6


4



6



1400I Sep Mar I 350




BMEL307







~ -r-- shy

4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



-

--bullbullw


--------

--




















1

















BMEL318






































OR



--






IIgt






-



--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-


2


2


2


2


2



6


4



6



1400I Sep Mar I 350




BMEL307







~ -r-- shy

4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



-

--bullbullw


--------

--




















1

















BMEL318
























--






IIgt






-



--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-


2


2


2


2


2



6


4



6



1400I Sep Mar I 350




BMEL307







~ -r-- shy

4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



-

--bullbullw


--------

--




















1

















BMEL318
























--

1 (a) [CO-2]

(b) [CO-4]

(c) [CO-3]

(d) [CO-6]

(e) [CO-5]

(f) [CO-I]

2 (a) [CO-I]

(b) [CO-I]

3 (a) [CO-2]

(b) [CO-2]

---~

-~

-


2


2


2


2


2



6


4



6



1400I Sep Mar I 350




BMEL307







~ -r-- shy

4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



-

--bullbullw


--------

--




















1

















BMEL318
























4 (a)

(b)

5 (a)

(b)

6 (a)

(b)

(b)

[CO-4]

[CO-4]

[CO-3]

[CO-3]

[CO-5]

[CO-6]

[CO-6]







14-18 18-22 22-24 88 98 47



OR


bull4 -

4

6

bull--shybull

4

4

6 shybullbull -----


Hydro-power plant

Steam power plant



-

--bullbullw


--------

--




















1

















BMEL318
























--




















1

















BMEL318






































BMEL318
























machine design -ii - solutiongeek.in filebmel314 . g. h. raisoni college of engineering, nagpur (an...

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