SARASWATI COLLEGE OF ENGINEERING, KHARGHAR… · SARASWATI COLLEGE OF ENGINEERING, KHARGHAR,NAVI MUMBAI-410210, Mechanical Engineering Department Applied Thermodynamics Assignment-3

SARASWATI COLLEGE OF ENGINEERING,

KHARGHAR,NAVI MUMBAI-410210,

Mechanical Engineering Department

Applied Thermodynamics

Assignment-1

Q.1) 0.25 kg of air at a pressure of 1 bar occupies the volume of 0.3m3. If this air expands

isothermally to a volume of 0.09m3. Find the initial air temperature and final temperature,

external work done, heat observed by the air, change in internal energy.

Q.2) A 1 kg of ideal gas of molecular weight 30 and specific heat ratio 1.4 is compressed according

to law of PV1.25 = C from 1bar absolute and 270C to pressure of 16bar Absolute. Calculate the

temperature at the end of compression, heat rejected, work done on the gas during the

process, change in enthalpy

Q.3) A turbine operates under steady flow condition receives steam at the following state pressure =

1.2Mpa, Temperature =1880C, Enthalpy = 2785 kJ/kg, velocity = 33.3m/sec and elevation =

3m. The steam leaves the turbine at the following state: pressure = 20Kpa, Enthalpy = 2512 kJ/kg, velocity = 100m/sec and elevation = 0m. Heat is lost to the surrounding at the rate of

0.29kJ/sec. If the rate steam flow to the turbine is 0.42kg/sec what is the power output of the

turbine in KW

Q.4) A gas of mass 1.5kg undergoes a Quasi-Static expansion which follows a relationship

p=a+bV, where ‘a’ and ‘b’ are constants. The initial and final pressures are 1000 & 200Kpa and the corresponding volumes are 0.2 & 1.2m3. The specific internal energy of the gas is

given by the relation u = 1.5pV-85 kJ/kg where p is Kpa and V is in m3. Calculate the net heat

transfer and the maximum internal energy of the gas attain during expansion.

Q.5) Air flows steadily at the rate of 0.5kg/sec through an air compressor, entering at 7m/sec

velocity, 100 kPa pressure and 0.95 m3/kg, volume leaving at 5m/sec, 700kPa and 0.19 m3/kg.

The internal energy of the rate leaving is 90kJ/kg greater than that of the air entering. Cooling water in compressor jackets absorbs heat from the air at the rate of 58kW (a) Compute the rate

of shaft work input to air in kW. (b) Find the ratio of the inlet pipe diameter to the outlet pipe

diameter.


KHARGHAR, NAVI MUMBAI-410210,



Assignment-2

Q.1) An inventor claims to have developed a refrigerating unit which maintains the refrigerated space at -6 ˚C while operating in a room where temperature is 27

˚C and has COP 8.5. Find out

whether his claim is correct or not?

Q.2) A Carnot engine takes heat from an infinite reservoir at 550 ˚C and rejects it to a sink 275 ˚C. Half of the work delivered by the engine is used to run generator and the other half is used to

run heat pump which takes heat at 275 ˚C and rejects it at 440 ˚C. Express the heat rejected at

440 ˚C by the heat pump as % of heat supplied to the engine at 550 ˚C. If the operation of the generator is 500W, Find the heat rejected/hour by the heat pump at 440 ˚C?

Q.3) 0.2kg of air at 1.5bar and 270C is compressed to a pressure of 15bar according to the law of

PV 1.25 =C. Determine work done on or by air, heat flow to or from the air, increase or decrease in entropy?

Q.4)(i) 1 kg of ice melts at constant atmospheric pressure and at 0 ˚C to form liquid water. If the

latent heat of fusion of ice is 333.3kJ/kg, Calculate the entropy change during process?

(ii) 5kg of air at 2bar and 30 ˚C is compressed to 24bar pressure according to the law of

PV 1.2 = C. After compression air is cooled at constant volume to 30 ˚C. Determine the volume

and temperature at the end of compression, Change in entropy during

Q.5) Give the expression to find change in entropy during constant pressure?

A domestic food freezer maintains a temperature of -15 ˚C. The ambient air is 30 ˚C. If the leaks into freezer at a continuous rate of 1.75kg/sec, What is the least power necessary to pump the

heat out continuously?





Assignment-3

Q.1) In a steam power plant operating on an ideal reheat Rankine’s cycle, the steam enters the high

pressure turbine at 3Mpa and 400 ˚C. After expansion to 0.6Mpa, the steam is reheated to 400 ˚C and then expanded the low pressure turbine to the condenser pressure of 10kPa.

Determine the thermal efficiency of the cycle and the quality of the steam at the outlet of low

pressure turbine?

Q.2) Explain process of reheating with help of T-s diagram in the Rankine’s cycle? Why it is used?

A steam power plant uses steam at boiler pressure of 150bar and temperature 500 ˚C at

condenser pressure of 0.1bar.find the quality of steam at turbine exhaust, cycle efficiency and

steam rate?

Q.3) In a single regenerative cycle the steam enters the turbine at 30bar and 400 ˚C and the exhaust

pressure is 0.1bar. The condensate is heated in a direct contact type heater which operates at 5bar. Find the efficiency and the steam rate of the cycle and the increase in mean temperature

of heat addition, efficiency and steam rate as compared to the rankine’s cycle. Neglect the pump

work?

Q.4) With help of T-s diagram explain the various process of ideal Rankine’s cycle and derive the

efficiency in terms of enthalpy? Why the Rankine’s cycle used as a standard reference for the

steam power cycle rather than Carnot cycle?

Q.5) (i) Prove the difference in specific heat capacities equal to Cp-Cv=R and Cp-Cv=TVβ 2 / kT

(ii) Deduce the Maxwell relations from thermodynamic property relations?





Assignment-4

Q.1) Prove thermal efficiency of Otto, Diesel and Dual cycle?

Q.2) In an air standard diesel cycle the stroke is 30 cm and dia is 25 cm. Pressure and

temperature at the start of compression is 100 kPa and 27˚C the cut off takes place at 6%

of the stroke and the compression ratio is 14. Find pressure and temperature at all points

i) Heat added, Heat rejected and net work done

ii) Mean effective pressure

Q.3) Derive condition for maximum work done in otto cycle interms of compression ratio and .

Q.4) Derive expression for mean effective pressure in Otto and Diesel Cycle.

Q.5) The peak pressure in an Otto Cycle is 21 bar and the minimum pressure is 1 bar with thermal

efficiency of 47.5% find-

i) Compression ratio

ii) Mean effective Pressure


KHARGHAR, NAVI MUMBAI-410210,



Assignment-5

Q.1) 0.45kg of CO and 1kg of air is contained in a vessel of volume 0.4m3 at 15˚C. Air has 23.3% of O2 and 76.7% of N2 by mass. Calculate the partial pressure of each constituents and total

pressure in the vessel. Molar volume of CO, CO2 and N2 are 28, 32 and 28kg/kmol.

Q.2) Methane at 1.013bar and 30˚ C enters an insulated mixing chamber at rate of 5kg/sec. It is mixed with air at 1bar in an air/methane mass ratio of 18. The flow is stead and kinetic energy

changes are negligible. Ambient pressure and temperature are 1.013bar and 30˚ C, determine

(a) the temperature of the mixing /kg of methane. Take Cv and Cp of methane as 1.7354kJ/kg/k

and 2.2537 kJ/kg/k respectively.

Q.3) What is effect of variation in back pressure on C-D nozzle performance.

Q.4) Explain how the normal shock wave is developed

Q.5) Derive with usual notations the relation for one dimensional isentropic flow of gas

)1( 2MV

dV

A

dA

SARASWATI COLLEGE OF ENGINEERING

MECHANICAL DEPARTMENT

SEM – III

CAMD ASSIGNMENTS

ASSIGNMENT – I

Q.1 A vertical square prism of side of base 50 mm, axis height 90 mm has its faces equally inclined with VP. A cylinder of diameter 50 mm, axis height 100 mm intersects the prism horizontally such that it’s axis is perpendicular bisector to axis vertical square prism. The plane containing both the axes is parallel to VP. Draw the projection of solid showing intersection of curve,

Q.2 A vertical cone with base diameter 100 mm, axis height 90 mm is penetrated by horizontal cylinder with bas diameter 50 mm and its axis parallel to VP. The axis of cylinder intersects the axis of cone at 30 mm above the base of cone. Draw the projection of solids showing curves of intersection.

Q.3 Figure shows FV and partial TV of an object. Draw using 1:1 scale, given FV and

i) Complete TV

ii) Auxiliary TV as seen in the direction of arrow A

iii) Right hand side view

Q.4 Figure shows incomplete FV, TV and Auxiliary FV of an object. Draw using 1:1 scale the following

i) Complete FV

ii) LHSV

ASSIGNMENT – II

Q.1 Define various parts of screw thread.

Q.2 Explain different types of threads. Also give conventional representation & designation of standard component & assembly of threaded parts in external and sectional views.

Q.3 Explain limits, fits & tolerances. Also dimensioning with tolerances indicating various types of fits in detail.

Q.4 Explain types of assembly drawings, part drawing, drawing for catalogues and instruction manuals, patent drawing.

Q.5 Explain steps involved in preparing assembly drawing & vice versa, sequence in assembly.

ASSIGNMENT – III

Q.1 Joints – Cotter, Knuckle

Q.2 Explain Keys – Parallel, sunk, woodruff, saddle, feather

Q.3 Explain Couplings – Muff, flanged

Q.4 Explain solid and bushed bearing.

Q.5 Classification of pulleys.

ASSIGNMENT-IV

Q.1 Explain different types of pipe joints

i) Flange joint

ii) Socket & Spigot joint

iii) Gland & stuffing box

iv) Expansion joint

Q.2 Explain different types of valves

i) Blow off cock

ii) Steam stop valve

iii) Gate valve

iv) Globe valve

v) Non-return valve

ASSIGNMENT – V

Q.1 Explain different parts of IC Engine in details.

i) Piston v) Carburetor

ii) Connecting rod vi) Fuel pump

iii) Cross head vii) Injector

iv) Crank shaft viii) Spark plug

Q.2 Explain jigs and fixtures

i) Drill jig

ii) Plate type Jig iii) Box type jig

iv) Milling fixture v) Turning fixture

Prof. Gaikwad L.M. 1 | P a g e


AY: 2013-14

Subject: Production Process: I Class: S.E. – III

Div. - C

Assignment: 1

Q. 1. Classify Production Processes in detail with applications.

Q. 2. What is Pattern? Explain different types of Pattern.

Q. 3. Explain different types of casting defects in detail.

Q.4. Explain in detail the Pressure die casting process.

Q.5. Write a short note on:

a) Shell mould casting

b) Investment Casting

c) Centrifugal casting

Assignment: 2

Q.1 Explain Rolling Parameters: Draught, spread, elongation, roll pressure, torque, work and

power in rolling.

Q.2.What is forging? Explain its basic principle.

Q.3. Explain the process of wire drawing.

Q.4. Explain in detail types of roll mills.

Q.5. Write Short Notes on:

a) Thread rolling

b) Seamless Tube Manufacturing by Rolling

c) Rolling Defects

Prof. Gaikwad L.M. 2 | P a g e

Assignment: 3

Q.1.What is weldability? Discuss various welding defects with their remedies.

Q.2. Explain Types of Weld Joint & Edge preparation.

Q.3. State difference between TIG & MIG welding.

Q.4. Explain in detail Submerged arc welding.

Q.5.Write Short Notes on:

a) Thermit welding

b) CO2 welding

c) Friction welding

Assignment: 4

Q. 1. What is Powder Metallurgy? Why gears are manufactured by powder metallurgy? List

advantages, disadvantages & applications.

Q. 2. What is Sintering? Explain its Mechanism.

Q. 3. Discuss the important steps of making powder in Powder Metallurgy.

Q. 4. What is NDT? Explain ultrasonic testing method.

Q. 5. Write a note on Radiographic non-destructive testing.

Assignment: 5

Q.1. Explain Injection Molding with Application.

Q.2. Explain Blow Molding of Polymers and Ceramics.

Q. 3. Explain extrusion of glass and Polymer.

Q. 4. Explain rotational molding process in detail.

Q.5. Write short note on:

a) Thermoforming

b) Compression molding

S.E MECHANICAL ENGINEERING (DIVISIONS : A& B)

SUB : PRODUCTION PROCESS – I

ASSIGNMENT NO : 01

1) Explain the classification of production process with examples.

2) Explain the different types of patterns with neat sketch.

3) What do you mean by allowance? Explain different types of

allowances and state their needs.

4) Explain any two types of casting process & State their advantages.

5) Explain defects in casting with suitable reasons.



ASSIGNMENT NO : 02

1) State the principle involved in forming process & process

characteristics.

2) Explain different types of rolling with neat sketch .

3) Write a short on roll pass design.

4) Explain the basic principle of forging & it’s types .

5) Explain with neat sketch Extrusion & Wire drawing.



ASSIGNMENT NO : 03

1) Classify welding process & name the equipments used in welding

process.

2) Explain with neat diagram Gas welding & Inert gas welding .

3) Name the different weld joints with neat diagram.

4) Write a short on welding defects .

5) Explain principle of powder metallurgy , it’s process & mention

their applications.



ASSIGNMENT NO : 04

1) Explain the process of powder making & Mechanism of sintering .

2) Explain Injection molding , Compression molding with neat sketch.

3) Mention the applications of plastic in engineering field.

4) Explain blow molding & extrusion of glass.

5) Explain about non- destructive techniques.



ASSIGNMENT NO : 05

1) Explain dye penetrant non – destructive techniques.

2) Explain with neat diagram Magnet & Electrical non-destructive

testing.

3) Explain Ultrasonic & Radiographic non-destructive method.

4) Advantages & limitations of non-destructive testing techniques.

5) Explain the sintering process in powder metallurgy.

SARASWATI COLLEGE OF ENGINEERING, KHARGHAR

MECHANICAL ENGINEERING DEPARTMENT

ACADEMIC YEAR 2013-2014

Subject: Strength of Material (SOM) Sem: III

ASSIGNMENT 1

Q-1) A tube of aluminum 40 mm external diameter & 20 mm internal diameter is fitted on a steel rod of 20 mm diameter. The composite bar is loaded in compression by an axial load P. Find the stress in aluminum, when the load is such that stresses in steel is 70 N/mm2 . Also find the value of P.

Take Es = 2 X 105 N/mm2 & Eal = 7 X 104 N/mm2 .

Q-2) Define Bulk Modulus. Derive an expression for Young’s Modulus, in term of Bulk Modulus & Poisson’s ratio.

Q-3) A weight of 200 kN is supported at three short pillars, each 500 mm2 in section. The central pillar is of steel & outer ones are of copper. The pillars are so adjucted that at temp. of 15 C , carries a equal load

ASSIGNMENT 2

Q-1) Establish the relationship between shear force, bending moment & rate of loading in beam.

Q-2) Draw a shear force and bending moment diagram for a simply supported beam of length L. suspended to a clockwise couple M at the centre of beam.

Q-7) List the assumption made in the theory of pure bending & hence derive the formula :

M = σ = E I y R

ASSIGNMENT 5

Q-1) A load of 500 N falls freely through a height of 150 mm on to a collar attached to the end of a vertical rod of 50 mm diameter & 2 meter long, the upper end of the rod being fixed to the ceiling. Calculate the maximum instantaneous extension of the bar. Also calculate the maximum stress in the bar. Assume E= 2X105 N/mm2.

Q-2) List the assumption made for a circular shaft & derive the torsional formula:

T = τ = C.θ

J R L

Q-3) Two shafts of the same material & same length are subjected to the same torque. If the first shaft is solid circular section & the second is of a hollow circular section, whose internal diameter is 2/3 of the outside diameter & the maximum shear stress developed in each shaft is same, compare the weight of the two shafts.

Q-4) Determine the diameter of the solid shaft which will transmit 300 kW at 250 rpm. The maximum shear stress should not exceed 30 N/mm2 & twist should not be more than 1ᴼ on a shaft length of 2 m. Take C=1 x 106 N/mm2

Q-5) Two elastic bars of same material & length, one of circular section of diameter 200 mm & the other of square section of side 200 mm, absorb the same amount of strain energy delivered by axial loads. Compare the ratio of stresses in two cases.

Q-6) For a rectangular section, show that the maximum shear stress is 1.5 times the average shear stress.

Documents

SARASWATI COLLEGE OF ENGINEERING, KHARGHAR… · SARASWATI COLLEGE OF ENGINEERING, KHARGHAR,NAVI MUMBAI-410210, Mechanical Engineering Department Applied Thermodynamics Assignment-3