Thermal-Engineering-I previous year question paper | 3341902 |

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Studying past papers are a valuable part of exam preparation and help keep revision focused on important themes whilst practicing exam style questions.

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Summer 2014 Thermal Engineering - I Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER IV –  • EXAMINATION – SUMMER-2014
Subject Code:3341902  Date: 04/05/2015
Subject Name: THERMAL ENGINEERING- I
Time:10:30 AM TO 01:00 PM  Total Marks: 70

Instructions:
1.  Attempt all questions.
2.  Make Suitable assumptions wherever necessary.
3.  Figures to the right indicate full marks.
4.  Use of programmable & Communication aids are strictly prohibited.
5.  Use of only simple calculator is permitted in Mathematics.
6.  English version is authentic.

***************

Q.1    Answer any seven out of ten.  14

1.  Define Dryness fraction of steam and state its value for dry and saturated steam

2.  Define Sensible heat and Latent heat

3.  State functions of feed check valve and economizer

4.  Define equivalent evaporation in context with steam boiler also state its unit.

5.  Define volumetric efficiency of air compressor

6.  Define condenser efficiency and vacuum efficiency for steam condenser

7.  List sources of Air leakage in steam condenser.

8.  List different types of calorimeter

9.  List various factors affecting convective heat transfer

10.  List mode of heat transfer and give example of each

Q.2  (a)  Give difference between Jet condenser and Surface Condenser   03

OR

(a)  Draw only neat sketch of surface type condenser and label it  03

(b)  Draw only neat sketch of Cochran boiler and show flue gas path in it  03

OR

(b)  Draw only neat sketch of Babcock and Wilcox boiler and show flue gas path in it   03

(c)  Explain water level indicator with neat sketch  04

OR

(c)  State four difference between induced draft and forced draft in context with steam boiler   04

(d)  State advantages of centrifugal compressors  04

OR

(d)  Explain in brief effect of clearance volume in reciprocating air compressor  04

Q.3  (a)  State needs for compounding of steam turbine  03

OR

(a)  Compare impulse and reaction turbine on three different basis  03

(b)  Draw velocity compounding diagram of steam turbine   03

OR

(b)  Draw Pressure compounding diagram of steam turbine  03

(c)  Steam enters nozzle with a velocity of 300 m/s with pressure of 3.5 bar with Dryness fraction 0.96 and expands isentropically to 2 bar, using Mollier chart find out change in enthalpy of steam and exit velocity of steam   04

OR

(c)  Apply steady flow energy equation (SFEE) to nozzle and derive equation of extreme velocity   04

(d)  Compare reciprocating air compressor and rotary air compressor on four different criteria.   04

OR

(d)  Explain in brief intercooling in multistage air compression with its advantages  04

Q.4  (a)  Define absorptivity, reflectivity and transmitivity in context with radiation  03

OR

(a)  A concrete wall of house is 50 cm thick and a surface area of 10 m X 5 m. The inside temperature of wall is 30◦C and outside temperature is 10◦C. The thermal conductivity of concrete is 0.8 W/m◦K. Calculate the heat loss through the wall.   03

(b)  State Fourier’s law for conduction and explain heat conducted through flat plate  04

OR

(b)  Define heat exchanger and give classificationwith brief introduction of each .  04

(c)  A boiler produces 10 kg of dry and saturated steam per kg of coal from feed water at 45◦C. The pressure of the steam is 10 bar. Find out equivalent evaporation also find boiler efficiency if calorific value of coal is 35000KJ/Kg07

Q.5  (a)  Explain concept of black body in brief  04

(b)  Draw Mollier chart and show isentropic and throttling process on it  04

(c)  Calculate enthalpy of 10 kg steam with temperature 300◦C and pressure of 14 bar03

(d)  Calculate entropy and volume of steam in above case i.e.Q.5(c) .Take Cp of steam= 2.1 KJ/KgK   03

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Winter 2014 Thermal Engineering - I Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
Diploma Engineering - SEMESTER–IV • EXAMINATION – WINTER • 2014
Subject Code: 3341902  Date: 28-11-2014
Subject Name: Thermal Engineering-I
Time: 02:30 pm - 05:00 pm  Total Marks: 70

Instructions:
1.  Attempt all questions.
2.  Make suitable assumptions wherever necessary.
3.  Figures to the right indicate full marks.
4.  English version is considered to be Authentic.

Q.1  (a)  1. Define two phase system and show on T-S diagram from 0° C water to superheated steam.  03

2. Define followings
( i ) Dryness fraction
(ii) Sensible heat
(iii) Triple point
(iv) Compressed liquid    04

(b)  Explain the process of finding dryness fraction using throttling calorimeter with neat sketch.   07

Q.2  (a)  Using steam table find entropy, enthalpy and volume of 5 kg wet steam having dryness fraction 0.86 at 20 bar pressure.  07

(b)  1. Differentiate between  fire tube and water tube boiler.  03

2. What is the difference between mounting and accessory explain water level indicator.   04

OR

(b)  During trial on a boiler following data has been recorded (i) Steam produced 2500 kg/hr  (ii) Coal used 250 kg/hr (iii) Feed water temperature 40° C (iv) Quality of steam dry and saturated (v) Calorific value of coal 30000 KJ/kg (vi) Pressure of steam boiler 12 bar.   Find 1. Actual evaporation 2. Equivalent evaporation  3. Thermal efficiency of boiler.   07

Q.3  (a)  1. Draw heat balance sheet of boiler.   03

2. Differentiate between impulse turbine and reaction turbine.   04

(b)  Why compounding of steam turbine is necessary? State three types of compounding and explain any one with diagram.   07

OR 

Q.3  (a)  1. Define prime movers, give classification of steam turbine.  03

2. Compare jet condenser with surface condenser.    04

(b)  What is cooling tower? State types of cooling tower and explain induced draft cooling tower.   07

Q.4  (a)  Draw schematic diagram of single stage reciprocating air compressor and explain its working with P-V diagram.   07

(b)  Write advantages and disadvantages of multi stage compression and intercooling.   07

OR 

Q. 4  (a)  Derive an expression for condition of maximum efficiency in case of two stage reciprocating compressor.   07

(b)  Find out minimum work required to compressed 2 kg of air in two stages from 10 N/cm2 and 30° C to 160 N/cm2 with perfect inter cooling. Take R=0.287 KJ/kg° K and Index n=1.3    07

Q.5  (a)  Explain various modes of heat transfer with examples.  05

(b) Find out rate of heat transfer from an I.C. Engine whose wall temperature is 260° C, area of surface is 0.4 m2,atmospheric temperature is 35° C and heat
transfer coefficient is 60 w/m2 k.   05

(c) Define (i) Absorptivity (ii) Overall heat transfer coefficient (iii) Black body (iv) Emissive power.   04

OR 

Q.5  (a)  State types of heat exchangers and write application of each of them.  05

(b) A boiler shell is made up of MS plate of 50 mm thick which is insulated by 10 mm lagging material inside the shell. The temperature of outside and inside of boiler are 30° C and 300° C. Considering thermal conductivity of MS plate and insulated material are 160 and 0.15 KJ/h m° K respectively.Find out overall heat transfer coefficient and heat transfer per unit area.  05

(c) State Fourier law for conduction. Why negative sign attach with temperature gradient  04

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Summer 2015 Thermal Engineering - I Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER IV –  • EXAMINATION – SUMMER-2015
Subject Code:3341902  Date: 04/05/2015
Subject Name: THERMAL ENGINEERING- I
Time:10:30 AM TO 01:00 PM  Total Marks: 70

Instructions:
1.  Attempt all questions.
2.  Make Suitable assumptions wherever necessary.
3.  Figures to the right indicate full marks.
4.  Use of programmable & Communication aids are strictly prohibited.
5.  Use of only simple calculator is permitted in Mathematics.
6.  English version is authentic.

***************

Q.1    Answer any seven out of ten.  14

1.  Define Dryness fraction of steam and state its value for dry and saturated steam

2.  Define Sensible heat and Latent heat

3.  State functions of feed check valve and economizer

4.  Define equivalent evaporation in context with steam boiler also state its unit.

5.  Define volumetric efficiency of air compressor

6.  Define condenser efficiency and vacuum efficiency for steam condenser

7.  List sources of Air leakage in steam condenser.

8.  List different types of calorimeter

9.  List various factors affecting convective heat transfer

10.  List mode of heat transfer and give example of each

Q.2  (a)  Give difference between Jet condenser and Surface Condenser   03

OR

(a)  Draw only neat sketch of surface type condenser and label it  03

(b)  Draw only neat sketch of Cochran boiler and show flue gas path in it  03

OR

(b)  Draw only neat sketch of Babcock and Wilcox boiler and show flue gas path in it   03

(c)  Explain water level indicator with neat sketch  04

OR

(c)  State four difference between induced draft and forced draft in context with steam boiler   04

(d)  State advantages of centrifugal compressors  04

OR

(d)  Explain in brief effect of clearance volume in reciprocating air compressor  04

Q.3  (a)  State needs for compounding of steam turbine  03

OR

(a)  Compare impulse and reaction turbine on three different basis  03

(b)  Draw velocity compounding diagram of steam turbine   03

OR

(b)  Draw Pressure compounding diagram of steam turbine  03

(c)  Steam enters nozzle with a velocity of 300 m/s with pressure of 3.5 bar withDryness fraction 0.96 and expands isentropically to 2 bar, using Mollier chart find out change in enthalpy of steam and exit velocity of steam   04

OR

(c)  Apply steady flow energy equation (SFEE) to nozzle and derive equation of extreme velocity   04

(d)  Compare reciprocating air compressor and rotary air compressor on four different criteria.  04

OR

(d)  Explain in brief intercooling in multistage air compression with its advantages  04

Q.4  (a)  Define absorptivity, reflectivity and transmitivity in context with radiation  03

OR

(a)  A concrete wall of house is 50 cm thick and a surface area of 10 m X 5 m. The inside temperature of wall is 3◦C and outside temperature is 10◦C. The thermal conductivity of concrete is 0.8 W/m◦K. Calculate the heat loss through the wall. 03

(b)  State Fourier’s law for conduction and explain heat conducted through flat plate   04

OR

(b)  Define heat exchanger and give classificationwith brief introduction of each .  04

(c)  A boiler produces 10 kg of dry and saturated steam per kg of coal from feed water at 45◦C. The pressure of the steam is 10 bar. Find out equivalent evaporation also find boiler efficiency if calorific value of coal is 35000KJ/Kg    07

Q.5  (a)  Explain concept of black body in brief  04

(b)  Draw Mollier chart and show isentropic and throttling process on it  04

(c)  Calculate enthalpy of 10 kg steam with temperature 300 C and pressure of 14 bar    03

(d)  Calculate entropy and volume of steam in above case i.e.Q.5(c) .Take Cp of steam= 2.1 KJ/KgK   03

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Winter 2015 Thermal Engineering - I Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – IV-EXAMINATION – WINTER 2015
Subject Code: 3341902  Date: 17/12/2015
Subject Name: Thermal Engineering-I
Time: 02:30 PM TO 5:00 PM  Total Marks: 70

Instructions:
1.  Attempt all questions.
2.  Make Suitable assumptions wherever necessary.
3.  Figures to the right indicate full marks.
4.  Use of programmable & Communication aids are strictly prohibited.
5.  Use of only simple calculator is permitted in Mathematics.
6.  English version is authentic.

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Q.1  Answer any seven out of ten.  14

1.  Explain Triple Point and Critical Point of  H2O.

2.  Define : (i) Degree of Superheat (ii) Sub- cooled liquid.

3.  Write in brief about “Indian Boiler Act”.

4.  Mention the function of Economiser and Air Pre-heater.

5.  What is Draft ? List any two important advantages of draft.

6.  Differentiate between Black body and Gray body.

7.   List any two properties of good insulating material. Give the value of thermal conductivity of Pure Copper and Glass Wool.

8.  Why small clearance is needed in Reciprocating Air Compressor ?

9.  State the methods for detection of air leakage in Condenser.

10.  State the functions of Steam Nozzle.

Q.2  (a)    Find the change in enthalpy when 4 Kg of water is evaporated from 30oC to dry saturated steam at a pressure of 17 bar. Take specific heat of water (Cpw) = 4.187 KJ/ Kg oK.  03

OR

(a)  1 Kg. of steam initially at a 5 bar absolute pressure and temperature of 200oC is isentropically expanded up to wet steam of 0.84 dryness fraction. Find change in enthalpy and final pressure with the help of Mollier Diagram only.   03

(b)  State the purpose of Super Heater in steam power plant.  03

OR

(b)  State the points for Boiler Inspection and explain any one of them.  03

(c)  Explain Throttling Expansion Process of steam by p-v, T- S and h-s diagram.  04

OR

(c)  Explain measurement of dryness fraction of steam by Combined Separating and Throttling Calorimeter with neat sketch.  04

(d)  Explain the working of Babcock and Wilcox boiler with simple figure.  04

OR

(d)  What do you understand by “Heat Balance” in a boiler ?  04

Q.3  (a)The following data was collected during a boiler trial :
(1) The pressure of steam generated = 12 bar.
(2) Condition of steam = 0.9 dry.
(3) Feed water temperature = 36oC.
(4) Average quality of steam generated = 2500 Kg/hr.
(5) Coal used = 300 Kg/hr.
(6) Calorific value of coal = 28000 KJ/Kg.
(7) Specific heat of water = 4.187 KJ/Kg K.     03

OR

(a)  A boiler producing 5000 Kg steam/hr at a 20 bar pressure. Temperature of steam is 300 o C and feed water is 50oC. Efficiency of boiler plant is 80%. If fuel consumption is 3500 Kg/hr, find out calorific value of a fuel oil. Take specific heat for steam and water as 2.1 KJ/Kg and 4.187 KJ/Kg respectively.   03

(b)  State the purpose of Cooling Tower and explain any one of them with sketch.  03

OR

(b)  State the functions of a Condenser. Draw a neat sketch of a Surface Condenser.   03

(c)  Explain pressure compounding for Impulse Turbine with sketch of general arrangement and graphical presentation of variation of pressure, velocity and specific volume.  04

OR

(c)  Define Prime Mover. Explain the working of simple steam engine with sketch.  04

(d)  Steam super heated by 80 o C and 17 bar pressure is expanded through a convergent- divergent nozzle up to 0.7 bar pressure . If the exit diameter of nozzle is 2.48 cm, then find out the flow of steam in Kg/sec.   04

OR

(d)  Assuming isentropic expansion, Calculate the exit area of nozzle , if steam  04 at a pressure of 12 bar and temperature of 250 o C is expanded in a nozzle to 2 bar . The mass flow rate of steam is 0.21 Kg/sec.

Q.4  (a)  Explain Jet condenser. State its limitations.  03

OR

(a)  What is multistage compression? State its advantages.  03

(b)  0.6 m3/min of air is compressed in a compressor from 1 bar to 10 bar pressure. Considering isothermal efficiency as 80%, determine indicated power of compressor.    04

OR

(b)  1 Kg of air at 1 bar and 27o C is compressed to 16 bar, compression index is 1.3. Assuming R = 0.287 KJ/Kg K and there is a perfect inter-cooling. Neglecting the clearance effect, calculate necessary minimum work done/Kg for compression.   04

(c)  Defferentiate between Reciprocating and Rotery Compressor.  07

Q.5  (a)  Explain Stefan-Boltzman Law of Radiative Heat Transfer. Write its equation indicating units of each symbol.  04

(b)  A boiler shell is made up of M.S. plate 50 mm thick which is insulated by 10 mm logging material. Outside and inside temperature of boiler are 30oC and 260oC respectively. If thermal conductivity of M.S. and logging material are 150 KJ/hr m K and 10 KJ/hr m K respectively, then find overall heat transfer co-efficient and heat transfer/unit area.  04

(c)  Write the basic equation of Convection and state factors which are affecting convective heat transfer.   03

(d)  Define thermal conductivity and explain Fourier , s Law of Conduction.    03

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Summer 2016 Thermal Engineering - I Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – IV • EXAMINATION – SUMMER- 2016
Subject Code: 3341902  Date: 12- 05- 2016
Subject Name: Thermal Engineering - I
Time: 10:30 AM TO 01:00 PM  Total Marks: 70

Instructions:
1.  Attempt all questions.
2.  Make Suitable assumptions wherever necessary.
3.  Figures to the right indicate full marks.
4.  Use of programmable & Communication aids are strictly prohibited.
5.  Use of only simple calculator is permitted in Mathematics.
6.  English version is authentic.

***************

Q.1 Answer any seven out of ten.  14

1.  What is two phase system? Give two examples of it.

2.  Define: (a) Pure substance (b) Evaporation

3.  List five industrialapplications of steam.

4.  Define: (a) Boiler mountings (b) Boiler accessories

5.  List five applications of steam nozzles.

6.  Why is compounding of simple steam turbine necessary?

7.  List five elements of steam condensing plant.

8.  Give four advantages of Hyperbolic cooling tower.

9.  Define “Volumetric efficiency” in context with air compressor.

10.  Define “Thermal conductivity” and give its unit.

Q.2  (a)  Draw only neat sketch of High level jet condenser and labelit.  03

OR 

(a)  List advantages and disadvantages of surface condenser.  03

(b)  Draw only neat sketch of Babcock-Wilcox boiler and label it.  03

OR   

(b)  List advantages and disadvantages of Lancashire boiler.  03

(c)  State four differences between Natural draft and Artificialdraft in context with steam boiler. 04

OR 

(c)  Explain Bourdon tube pressure gauge with neat sketch.  04

(d)  State four differences between Reciprocating and Rotary aircompressors.  04

OR 

(d)  What is intercooling in context with air compressor? List advantages of intercooling.   04

Q.3  (a)  State the function of (1) Blades (2) Casing (3) Governing system in context with steam turbine.   03

OR 

(a)  Define “Steam nozzle”. Drawneat sketches of two main typesof nozzles along with velocity and pressure distribution curves.   03

(b)  Explain working principle of Impulse steam turbine with neat sketch.  03

OR 

(b)  State advantages and disadvantages of velocity compounding.  03

(c)  Derive an equation for outlet velocity of steam through nozzle by applying steady flow energy equation.   04

OR 

(c)  Steam enters a nozzle with a velocity of 350 m/s at a pressure of 4 bar with
dryness fraction of 0.95, and expands isentropically to 2.2 bar. Using
following table, find out change in enthalpy and exit velocity of steam.

(d)  State advantages of multistage air compression.  04

OR 

(d)  With the help of p-v diagram, explain intercooling in 2 - stage air compression.   04

Q.4  (a)  State and explain in briefvarious modes of heat transfer.  03

OR 

(a)  On a substance, 54.5 KW energy is incidenting out of which the radiation absorbed is 21.6 KW and the radiation reflected is 11 KW. Calculate Reflectivity, Transmissivity and absorptivity of the substance.  03

(b)  Differentiate between Free convection and Forced convection.  04

OR 

(b)  Define “Heat exchanger”. With the help of neat sketches explain in brief the parallel flow, counter flow and cross flow heat exchangers.   04

(c)  In a boiler, 525 Kg/hr of coal is used to produce 5200 Kg/hr of steam at a pressure of 15 bar and temperatureof 250º C. The feed water temperature is 27º C and the CV of fuel is30000 KJ/Kg. Assuming Cp of water =4.2 KJ/KgK and Cp of steam = 2.1 KJ/KgK, calculate: (1) Equivalent evaporation (2) Boiler efficiency (3) Boiler power.
At 15 bar pressure, specific enthalpy of steam (gas) is 2789.9 KJ/Kg and saturation temperature of steam is 198.3º C.     07

Q.5  (a)  Explain in brief:
(1) Stefan-Boltzmann’s law of total radiation (2) Emissivity     04

(b)  Draw the Mollier chart. Show Throttling process and Critical point in it.  04

(c)  Explain in brief the working ofEconomiser with neat sketch.  03

(d)  Using following table, find out the enthalpy and entropy of5 Kg of steam at
14 bar pressure and 300º C temperature. Take Cp of steam = 2.1 KJ/KgK.
Saturation temperature at14 bar pressure is 195º C.

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Winter 2016 Thermal Engineering - I Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – IV • EXAMINATION – WINTER - 2016
Subject Code: 3341902  Date:19 -11 - 2016
Subject Name: THERMAL ENGINEERING I
Time: 02:30 PM TO 05:00 PM  Total Marks: 70
Instructions:

1.  Attempt all questions.
2.  Make Suitable assumptions wherever necessary.
3.  Figures to the right indicate full marks.
4.  Use of programmable & Communication aids are strictly prohibited.
5.  Use of only simple calculator is permitted in Mathematics.
6.  English version is authentic.

***************

Q.1 Answer any seven out of ten.  14

1.  Define 1] sensible heat 2] dryness fraction

2.  State four factors affecting the selection of a boiler.

3.  State the function of economizer and fusible plug.

4.  State concept of steam prime-movers.

5.  State the function of condenser and cooling tower in a steam power plant.

6.  Define the following terms with reference to air compressor. 1] isothermal efficiency 2] free air delivered

7.  State four applications of compressed air.

8.  Define 1] conduction 2]convection

9.  State four properties of good insulators.

10.  State the method of measurement of dryness fraction.

Q.2  (a)  What is throttling? Draw throttling process on P-V and T-S diagram.  03

OR

(a)  Explain method of determining dryness fraction by throttling calorimeter with neat sketch.  03

(b)  Find out enthalpy and entropy of steam having pressure of 20 bar and dryness fraction 0.85. Use  mollier chart and also draw sketch.  03

OR

(b)  Explain formation of steam and its various phases.   03

(c)  Explain Cochran  boiler with neat sketch.  04

OR

(c)  Differentiate between boiler mountings and accessories.  04

(d)  Differentiate between induced draft and forced draft fan with reference to boiler.   04

OR

(d)  State the main safety precautions to be taken in boiler house as per IBR.  04

Q.3  (a)  Differentiate between jet condenser and surface condenser.  03

OR

(a)  State the advantages of condensers in steam power plant.  03

(b)  Classify cooling towers and mention why they are used?   03

OR

(b)  Explain natural draught hyperbolic cooling towers with neat sketch.  03

(c)  Derive the condition of maximum discharge through steam nozzle. 04

OR

(c)  Dry and saturated steam at 12 bar pressure enters the nozzle. The pressure is reduced to 1.5 bar. If the expansion if frictionless adiabatic then find out the final velocity.   04

(d)  Differentiate between impulse and reaction turbine.  04

OR

(d)  State the necessity of compounding the steam turbine and explain velocity compounding.  04

Q.4  (a)  Differentiate between reciprocating and rotary compressor.  03

OR

(a)  Explain the need of multistage compression and state its advantages.  03

(b)  A compressor compresses the air from 1 bar to absolute to 7 bar absolute pressure. The clearance volume is 2130 cm3/sec. The compression and expansion is according to PVn= C. If the volumetric efficiency of compressor is 85%, find out the stroke volume. Take n = 1.3.   04

OR

(b)  Draw neat sketch of a single stage reciprocating compressor and explain its working.  04

(c)  Define the following terms. 1] thermal conductivity 2] absorptivity 3] reflectivity 4] emissivity 5] black body 6] emissive power 7] laminar flow  07

Q.5  (a)  A boiler is generating 10 kg of steam/kg of coal. The calorific value of the coal is 35,280 kJ/Kg. The heat content of steam is 2835 kJ/Kg and feed water temperature is 450C. Calculate 1] equivalent evaporation 2] thermal efficiency   04

(b)  State the types of rotary air compressor and explain any one type of air compressor.  04

(c)  State the types of heat exchangers. Describe any one type of heat exchanger with sketch.  03

(d)  State the applications of steam nozzles.  03

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