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Mechanical Dept., SCOE P.P.-II S.E.- IV

Prof. Gaikwad L.M.

Saraswati Education Society

Saraswati College of Engineering SECTOR 05, KHARGHAR NAVI MUMBAI

Mechanical Engineering Department

ASSIGNMENTS

CLASS: S.E.-IV SUB: PRODUCTION PROCESS-II

1. CLASSIFICATION, SELECTION AND APPLICATION OF MACHINE TOOLS

Q.1 Explain classification, selection and application of following machine tools:

a. Lathe machine b. Milling machine c. Drilling machine

Q.2 Distinguish between gear hobbing and gear shaping

Q.3 Write a short note on:

a. Gear Milling b. Gear Shaving

2. CNC MACHINES

Q.1 Define CNC. State functions, advantages, disadvantages and applications of it.

Q.2 Differentiate between Open loop and Closed loop systems.


a. CMM

b. G and M Codes

c. Machining Centers

3. METAL CUTTING AND TOOL ENGINEERING

Q.1 Clearly stating the assumption derive the relationship 2ϕ+β-γ=π/2 in Merchant’s original

theory.

Q.2 following data was recorded in orthogonal cutting operation machine with carbide tipped

tool. Cutting speed 120 m/min, feed 0.2mm/rev, depth of cut 2mm, chip thickness 0.45mm,

cutting force 185kgf, feed force 75kgf, rake angle 100 Calculate: 1. Chip thickness ratio 2.

Resultant force 3. Shear angle 4. Length of shear plane 5. Frictional force 6. Frictional angle

7. Normal compressive force 8. Coeff. of friction 9. Shear force 10. Shear velocity

Q.3 Explain the effect of various parameters on cutting forces.


Prof. Gaikwad L.M.

Q.4 The following data refer to an orthogonal cutting operation on a steel tube with a H.S.S.

tool:

Cutting velocity = 0.45 m/s, Velocity of chip flow = 0.30 m/s, Coeff. of friction = 1.82

Shear angle = 41.80, Friction force = 940 N Find rake angle and the components of cutting

forces.

4. MEASUREMENT OF TOOL FORCES AND ECONOMICS OF METAL CUTTING

Q.1 What do you mean by tool life? Explain the effect of speed, feed, depth of cut, tool

material and geometry on tool life.

Q.2 List out and explain the various types of tool wear mechanism.

Q.3 Discuss the effect of cutting speed on various cost of machining. Derive an expression

for optimum cutting speed and tool life for minimum cost.


(i) Tool dynamometer

(ii) Cutting tool material

(iii) Cutting fluid

5. SURFACE FINISH, CUTTING TOOL MATERIALS, COOLANTS

Q.1. Explain the Effect of various parameters on surface finish.

Q.2 How will you select the grinding wheel? Explain dressing and truing of grinding wheel.

Q.3 Write a note on:

a. Function of coolant

b. Tool life and surface finish

c. Types of coolants

6. DESIGN OF CUTTING TOOLS OR TOOL DESIGN

Q.1 Explain with neat sketch the orthogonal rake system (ORS) of describing a single point

cutting tool geometry.

Q.2 Explain various steps involved in the design of circular pull type broach with neat sketch.


Prof. Gaikwad L.M.

Q.3 Draw a twist drill. Explain all the elements and angles of it. Also explain the effect of

these on force and power.

Q.4 Design & draw a circular form tool for forming the work piece for the shape given in fig. 1, the

bar is 50mm diameter steel bar. Assume rake & clearance angle 100 & 80 respectively. The form tool

is H.S.S.

Ø50Ø30

10

5

5

5

Ø40

Figure 1.

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Mechanical Engineering Department Class: S.E. (Mech) ASSIGNMENTS 2013-14 Sem: IV (A, B & C) Sub: FM Sub Incharge- Ganesh Jadhav ************************************************************************************

ASSIGNMENT NO. 1

1. A cylindrical tank of cross sectional area 600 �� and 2.6 m height is filled with water upto a

height of 1.5 m and remaining with oil of specific gravity 0.78. the vessel is open to atmospheric

pressure. Calculate;

a) Intensity of pressure at the interface

b) Absolute and gauge pressures on the base of the tank in terms of water head, oil

head and N/��.

2. A circular plate 1.5 m diameter is submerged in water, with its greatest and least depths below

the surface being 2m and 0.75m respectively. Determine;

a) The total pressure on one face of the plate, and

b) The position of the centre of pressure.

3. A buoy having a diameter of 2.4 m and length 1.95 m is floating with its axis vertical in sea water

(specific weight = 10 KN/��). Its weight is 16.5 KN and a load of 1.65 KN is placed centrally at its

top. If the buoy is to remain in stable equilibrium, find the maximum permissible height of the

centre of gravity of the load above the top of the buoy.

4. Explain pressure inside a water Droplet, Soap bubble and a Liquid jet.

5. Derive expression for Pascal’s law.

ASSIGNMENT NO. 2

1. Explain various types of fluid flow and types of flow lines.

2. Derive an expression for 3 dimensional continuity equations.

3. Explain stream functions for two dimensional incompressible flows.

4. Equation for source and sink.

5. Given that � = −4��(�� − 3��)

� = 4��(3�� − ��)

Examine whether these velocity components represent a physically possible two dimensional

flow; if so whether the flow is rotational or irrotational ?



Mechanical Engineering Department Class: S.E. (Mech) ASSIGNMENTS 2013-14 Sem: IV (A, B & C) Sub: FM Sub Incharge- Ganesh Jadhav

ASSIGNMENT NO. 3

1. Derive an expression for Euler’s equation of motion and then derive Bernoulli’s equation.

2. Derive flow of viscous fluid between two parallel plates (coquette flow).

3. A crude oil of viscosity 0.9 poise and relative density 0.9 is flowing through a horizontal circular

pipe of diameter 120mm and length 12 m. calculate the difference of pressure at the two ends

of pipe, if 785 N of the oil is collected in a tank in 25 seconds.

4. A 300mm × 150mm venturimeter is provided in a vertical pipeline carrying oil of specific gravity

0.9 flows being upward. The difference in elevation of the throat section and entrance section of

the venturimeter is 300mm. the differential U-tube mercury manometer shows a gauge

deflection of 250mm. calculate;

a) The discharge of oil, and

b) The pressure difference between the entrance section and the throat

section.

Take the co-efficient of meter as 0.98 and specific gravity of mercury as 13.6.

5. Explain kinetic energy and momentum correction factors

ASSIGNMENT NO. 4

1. Derive flow of viscous fluid in circular pipes- Hagen poiseuille law.

2. Derive universal velocity distribution equation

3. Water flows through a pipe of diameter 300 mm with a velocity of 5 m/s. if the coefficient of

friction is given by � = 0.015 + �.��

��.� where Re is the Reynolds number, find the head loss due

to friction for a length of 10 m. take kinematic viscosity of water as 0.01 stoke.

4. Derive common equation for velocity distribution for both smooth and rough pipes.

5. A farmer wishes to connect two pipes of different lengths and diameters to a common header

supplied with 8 × 10�� /sec of water from pump. One pipe is 100 m long and 5 cm in

diameter. The other pipe is 800 m long. Determine the diameter of the second pipe such that

both pipes have the same flow rate. Assume the pipes to be laid on level ground and friction co-

efficient for both pipes as 0.02. Also determines the head loss in meters of water in the pipes.



Mechanical Engineering Department Class: S.E. (Mech) ASSIGNMENTS 2013-14 Sem: IV (A,B & C) Sub: FM Sub Incharge- Ganesh Jadhav ************************************************************************************

ASSIGNMENT NO. 5

1. Explain the boundary layer separation and its control.

2. Explain the boundary layer thickness: A] displacement thickness

B] Momentum thickness

C] Energy thickness

3. On a plate of 2 m(length) x 1 m(width), experiments were conducted in a wind tunnel with a

wind speed of 50 km/hr. the plate is kept at such an angle that the co-efficient of drag and lift at

0.18 and 0.9 respectively. Determine:

A] Drag force

B] Lift force

C] Resultant force

D] Power exerted by the air stream on the plate takes density of air 1.15

. Kg/meter cube

4. Explain the Von-Karman momentum integral equation for the boundary layers.

5. Explain concept of drag and lift and concept of stream lined body and bluff bodies.



Mechanical Engineering Department Sem: IV (Rev) Sub: MATERIAL TECHNOLGY

S.E. (Mech) 2013-14

Assignments

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ASSIGNMENT NO 01

1) Briefly explain the classification of materials with examples. 2) Explain point defects in detail with neat diagrams. 3) Discuss FCC Unit Cell. Determine A.P.F. For FCC Unit Cell. 4) Differentiate Between – 1. Edge Dislocation & Screw Dislocation 2. Single Crystal & Poly Crystal 5) With the help of stress-strain diagram explain elastic & plastic deformation.

ASSIGNMENT NO 02

1) Define fracture & explain types of fracture.

2) Explain the phenomenon of “fatigue”.

3) Explain the effect of temperature and creep on mechanical behavior of materials.

4) What Are The Characteristics Of Brittle Fracture?

Discuss Griffith’s Theory and Derive Griffith’s Equation.

5) Write a short note on creep resistance materials.

]

ASSIGNMENT NO 03

1) Define “alloy”. What is the use of alloys in engineering field?

2) Explain different types of phase diagrams. 3) Write a short note on important of iron as engineering materials.

4) Explain in detail iron- carbon diagram. 5) Explain TTT diagram.

ASSIGNMENT NO 04

1) Classify heat treatment process and explain annealing in detail.

2) Explain surface hardening methods & state their significance and applications.

3) Explain the signification of alloying elements.

4) Explain the effect of alloying elements on phase transformation.

5) Classify the tools steels and list their properties.

ASSIGNMENT NO 05

1) Explain how composite materials are better than applications.

2) Explain polymer matrix composites.

3) Explain the properties of Nano - materials and their applications.

4) Explain different types of polymerization with examples. 5) Explain the processing of composites.

SARASWATI COLLEGE OF ENGINEERING

KHARGHAR , NAVI MUMBAI

MECHANICAL ENGINEERING DEPARTMENT

ASSIGNMENT NO 1

1) Write a note on types of constrained motions.

2) Explain classification of kinematic pairs.

3) Explain types of joints.

4) Explain inversions of Four Bar Chain.


ASSIGNMENT NO 2

1)Explain Peaucellier’s mechanism with neat sketch.

2) Explain Hart's mechanism with neat sketch.

3)Explian Tchebicheff’s mechanism with neat sketch & prove for the ratios of links.

4)Explian Grasshopper's mechanism with neat sketch.

5)Explain Ackerman steering gear mechanism with neat sketch & derive equation for it.




ASSIGNMENT NO 3

1) Explain types of instantaneous center of rotation.

2) Explain Kennedy's Theorem.

3) A mechanism, as shown in Figure has the following dimensions:

OA = 200 mm; AB = 1.5 m; BC = 600 mm; CD = 500 mm and BE = 400 mm. Locate all the

instantaneous centres. If crank OA rotates uniformly at 120 r.p.m. clockwise, find 1. the velocity of

B,C and D, 2. the angular velocity of the links AB, BC and CD.

4) In the mechanism, as shown in Figure, the crank OA rotates at 20 r.p.m. anticlockwise and gives

motion to the sliding blocks B and D. The dimensions of the various links are OA = 300 mm; AB =

1200 mm; BC = 450 mm and CD = 450 mm




ASSIGNMENT NO 4

1) Explain Cam and its Classifications.

2) Explain Followers and its Classification.

3) Define Pressure angle and method to control pressure angle

4) A cam is to give the following motion to a knife-edged follower :

1. Outstroke during 60° of cam rotation ; 2. Dwell for the next 30° of cam rotation ;

3. Return stroke during next 60° of cam rotation, and 4. Dwell for the remaining 210° of cam

rotation.

The stroke of the follower is 40 mm and the minimum radius of the cam is 50 mm. The

follower moves with uniform velocity during both the outstroke and return strokes. Draw the pro-

file of the cam when (a) the axis of the follower passes through the axis of the cam shaft, and

(b) the axis of the follower is offset by 20 mm from the axis of the cam shaft

Draw cam profile & displacement,Velocity, Acceleration & jerk diagrams.




ASSIGNMENT NO 5

1) Explain types of belts.

2) Derive an equation for length of belt for open & cross system

3) Explain velocity ratio,slip & creep.

4) Explain centrifugal tension, initial tension & derive condition of maximum power transmission

5) Explain types of chains chordal action & derive Length of chain.




ASSIGNMENT NO 6

1) Explain Law of gearing.

2) Explian with neat sketch involute and Cycloid gear tooth profile, Construction of Involute profile.

3) Derive an equation for length of Path of contact& arc of contact.

4) Derive an equation for numbers of teeth for interference.

5) A pinion having 30 teeth drives a gear having 80 teeth. The profile of the gears is involute

with 20° pressure angle, 12 mm module and 10 mm addendum. Find the length of path of contact,

arc of contact and the contact ratio.




Sem: VI (Rev) Sub: MECHANICAL VBIBRATIONS T.E. (Mech) 2013-14

Assignments

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Assignment No.1

1) State the equation of motion for various damped system for single degree freedom system.

Plot the displacement versus time curve for each system and discus its Significance.

2) Prove that for finding the natural frequency of spring mass system, the mass of the spring

can be taken in to account by adding one third of its mass to main mass.

3) A vehicle of mass 1200 kg. the suspension has a spring constant 400 KN/m, Damping ratio

0.5. If the vehicle speed is 100 Km/hr determine displacement amplitude of vehicle. The

road surface varies sinusoidaly with amplitude of 0.05 m and wavelength of 6 m.

4) A roller of mass m and radius r rolls without sleeping in curved path of radius R then

determine natural frequency of system

5) What is response for single degree freedom under damped system.

Assignment No.2

1) Answer the following

1) Define the logarithmic decrement and derive the necessary relation interms of

damping ratio.

2) Draw and explain frequency response curve for motion transmissibility.

2) Determine natural frequency, damped natural frequency, damping ratio, Logarithmic

Decrement for the system as shown

3) Use LaGrange’s Method to derive the differential equations governing the motion of the

system using θ1,θ2, X as generalized coordinates.

4) Determine Meq and Keq for system as shown use ‘X’ as generalized coordinate measured

from equilibrium position.

5) Determine the frequency equation for a spring mass system as shown in fig.

Assignment No.3

1) Explain what do you mean by eigen values and eigen Vectors

2) What is response for single degree freedom underdamped system

3) Using Holzer method, determine natural frequency for torsional vibration for 4-degree of

freedom system in range of 0 to 1 rad/sec. Draw mode shapes for frequency you have

found Kt= 1 Nm/rad, J = 1 kg-m2

4) Find the lowest frequency of transverse vibration of system as shown by Releigh’s Method

5) Use LaGrange’s Equation to derive differential equations governing the equations of

motion as shown in fig.Use X1 and X2 as generalized coordinate, assume disc rolls

without slip

Assignment No.4

1) A machine of mass 1000 kg is acted upon by an external force of 3000 N at 1800 rpm. To

reduce the effect of vibration, isolators having static deflection of 2mm under machine

weight and damping factor of 0.2 are used Determine,

a) Amplitude of Vibration of Machine

b) Force transmitted to Foundation

c) Phase Lag

d) Phase angle between transmitted force and exited force

2) A Seismic instrument is mounted on machine at 1000 rpm the natural frequency of Seismic

instrument is 20 rad/Sec. The instruments record relative amplitude of 0.5mm. Compute

displacement, velocity and acceleration of machine. Damping of Seismic instrument is

neglected.

3) Explain principal of accelerometer with sketch and frequency response curve

4) Write a short note on cam dynamics and explain follower jump phenomenon in cam

5) An under damped shock absorber is to be design for a motor cycle of mass 250 kg such that

the damped period of vibration 3 sec and the amplitude of vibration reduced to one tenth in

one cycle, find

1) Stiffness of spring

2) Damping Coe. Of Shock absorber

3)

Assignment No.5

1) Derive the expression for critical speed of shaft,

2) Five pulleys P,Q,R,S,T are equally spaced on shaft, If mass of pulleys P,R and S are 10,8 and

16 kg resp. and angular distance between P and R is 90˚, between R and S is 135˚ find mass

of pulleys Q and T. Also find angular position of pulleys Q and T.

3) A vertical steel shaft 15 mm dia. Is held in long bearings 1 metre apart and carries a disc of

mass 15 kg at centr. The eccentricity of disc mass is 0.30 mm. The modulus of elasticity for

the shaft material is 200 GPa and permissible stress is 70 MPa. Neglect the mass of the shaft

and find

1) Critical speed of shaft

2) Unsafe range of speed of shaft

4) Discuss the balancing of V-engine and find resultant primary and secondary force.

5) A six cylinder four stroke in line engine has a firing order 1-4-5-2-3-6. Firing order take place

with equal angular interval. The mass of reciprocating parts per cylinder is 2 kg. stroke of 100

mm and connecting rod of length 200 mm. the cylinder lines are spaced 300 mm apart. The

crankshaft speed is 300 rpm examine system for balance of primary and secondary forces and

couples. If not completely balanced then determine unbalance of forces and couples




Sem: VI (Rev) Sub: E-Commerce & Industrial Financing T.E. (Mech) 2013-14

Assignments

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Assignment I

1) What is Information Technology Act 2000?

2) Explain briefly emergence of Internet?

3) Differentiate between physical Commerce and E-Commerce? What are the advantages

and disadvantages of Ecommerce?

4) Explain in Brief Internet Service Providers?

5) Comment on Transition to E-commerce in India with suitable example?

Assignment II

1) What are E-Marketing, Describe different types of E-payment Systems?

2) Explain major trends in E-SCM

3) Explain with neat sketch how E-CRM is used to enhance the business?

4) Explain E-branding and E-advertisement?

5) List and Explain the security requirement for safe E-Payment?

Assignment III

1) Write short note on following

1) RBI

2) SEBI

2) Explain Functions of RBI

3) How new securities are issued

4) Explain functions of Stock Exchange

5) What do you mean by exchange rate? What is different exchange rate? List

factors affecting it?

Assignment IV

1) Discuss different types of financial Markets?

2) What do you mean by Cash Conversion Cycle? Explain it’s significance in

working capital management?

3) What do you mean by overtrading? What are the ways to tackle problem of

Overtrading

4) Distinguish between micro finance vs macro finance

5) Explain in brief Software agents

Assignment V

1) Discuss the various functions of finance manager

2) Explain term structure and risk structure of interest rate

3) Discuss the role of firewall? Explain in detail fire wall component and list

the benefits internet fire wall

4) Explain the different investment appraisal techniques which the financial

manager depends for their investment decision making

5) Explain the strategic and tactical issues of Take-Over activity and also list

advantages of on-line Marketing

6) Make a comparison of the NPV and IRR methods based on the following

aspects

i) Non conventional cash flow

ii) Mutually exclusive Projects




Sem: VI (Rev) Sub: HYDRAULIC MACHINERY T.E. (Mech) 2013-14

Assignments

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Assignment No.1

Q.1 What are the limitations of pelton wheel turbine?

Q.2 Differentiate between – Inward flow and Outward flow reaction turbine. - Impulse and Reaction Turbine. Q.3 What are the advantages of hydropower plant? Q.4 A single jet pelton turbine is required to generate 2000KW. The total head from the reservoir to entry of nozzle is 250 m. The blade angle at outlet is 15° and the reduction in the relative velocity while passing over the blade is 5%. The coefficient of velocity is 0.98, speed ratio 0.46 and mechanical efficiency 95%. The head loss in penstock is 10 m. Determine – 1) the overall efficiency

2) velocity triangle at inlet and outlet 3) force exerted by the jet on bucket 4) energy lost due to the jet at bucket exit 5) jet diameter. Q.5 The water available for pelton wheel is 4 m3/s and the total head from reservoir to the nozzle is 250 m. The turbine has two runners with two jets per runner. All the four jets have same diameters. The pipe is 3 km long. The efficiency of transmission through the pipeline and the nozzle is 91% and efficiency of each runner is 90%. The velocity coefficient of each nozzle is 0.975 and coefficient of friction '4f' for the pipe is 0.0045. Determine – 1) the power developed by turbine

2) the diameter of the jet 3) the diameter of the pipeline. Q.6 Data given below refers to twin jet pelton wheel – power = 6000 KW, gross head = 250 m, head lost in penstocks = 10m, speed = 360 rpm, velocity coefficient of nozzle = 0.98, overall efficiency = 85%, blade deflection angle = 165°, ratio of wheel velocity to jet velocity = 0.46, percentage of loss in relative velocity due to friction in blades = 10. Determine 1) dia. Of jet and wheel 2) Hydraulic efficiency 3) W.D. Per kg of water. 4) Power not utilized and going as waste with the discharge. Q.7 A single jet Pelton Wheel turbine is required to drive a generator to develop 10000 KW. The available head at the nozzle is 760 m. Assume the following: Electric generator efficiency 95%, Pelton wheel efficiency 87%, coefficient of velocity for nozzle 0.97, mean bucket velocity 0.46 of jet velocity, outlet of angle of buckets 15º and relative velocity of the water leaving the buckets 0.85 of that at inlet, Find – 1) diameter of the jet 2) flow in m3/s 3) force exerted by jets on buckets.

Assignment No.2

Q.1 With neat sketch explain difference between inward and outward flow reaction turbine. Q.2 Explain function and types of draft tube. Q.3 Write a short note on degree of reaction of turbine. Q.4 A Francis turbine with overall efficiency of 75% is required to produce 148.25KW

power. It is working under a head of 7.62 m. The peripheral velocity = 0.26√2gH and radial velocity of flow at inlet is 0.96√2gH. The wheel runs at 150rpm and hydraulic

losses in the turbine are 22% of the available energy. Assuming radial discharge, determine 1) guide blade angle 2)vane inlet angle 3) dia of wheel at inlet 4) width of the wheel at inlet. Q.5 A Kaplan turbine working under head of 20m develops 11772KW S.P. The outer diameter of the runner is 3.5m and hub diameter is 1.75 m.the guide blade at extreme edge is 35°. the hydraulic and overall efficiency of the turbine are 88% and 84%

respectively. If the velocity of the whirl is zero at outlet determine 1) runner vane angle at inlet and outlet 2) speed of the turbine. Q.6 A reaction turbine runner has inlet dia 3.5 m, exit dia 2.1 m, width 0.5m both at inlet and exit and vane angles with the direction of motion 60° and 150° respectively. If

the guide blade angle is 15° and rate of flow of water is 15 m3/s. Calculate the required speed of the runner for the smooth flow at inlet, power , energy extracted per unit weight of water and pressure drop through the runner. Q.7 A Kaplan turbine is fitted with 5 aerofoil blades and has a speed of 120 rpm. The

mean radius of the blade circle is 1.5 m and the blade length in radial direction is 0.5 m. The inlet and outlet blade angles are 113° and 63° respectively and the chord

length is 2.5 m. the values of CL and CL are 0.7 and 0.04 respectively. The turbine is supplied with water under the head of 10 m. If the flow rate is 0.357 determine 1) overall efficiency 2) Drag.

Assignment No.3

Q.1 Define – specific Speed, unit speed and unit power as applied to turbine. Q.2 What are the causes of cavitation? How will you prevent in hydraulic turbines? Q.3 Explain different criterias used for selecting turbines and their significance.

Q.4

Q.5

Assignment No.4

Q.1 What is indicator diagram? What is its importance in reciprocating pumps ? Q.2 Classify the reciprocating pumps and define slip, percentage slip and negative slip. Q.3 What is air vessel? Explain its function with neat diagram. Q.4 Explain working of gear pump with neat sketch Q.5

Q.6 A single acting reciprocating pump has a plunger of 80 mm diameter and a stoke length of 150 mm. It takes it supply of water from a sump 3m below the pump through a ipe 4.5 m long and 30 mm diameter. It delivers water to a tank 12 m above the pump through a ipe 25 mm diameter and 15 m long. If separation occurs at 78.48 kn/m2 below the atmospheric pressure, find the maximum speed at which the pump may be operated without separation. Assume the plunger to have simple harmonic motion.

Assignment No.5

Q.1What is priming in centrifugal pump? Why is it necessary? Q.2 Explain the methods to balance axial and radial thrust in centrifugal pumps? Q.3 Explain the different troubles in centrifugal pumps and its causes? Q.4

Q.5

Q.6

Assignment No.6

Q.1 Explain the following with neat sketch – 1. Pump characteristics

2. System characteristics

3. Operating points.

Q.2 Explain NPSHavailable and NPSHrequired with neat sketch. Q.3 Write a short note on application of CFD in turbines. Q.4

Q.5



Mechanical Engineering Department Sem: VI (Rev) Sub: INTERNAL COMBUSTION ENGINE T.E. (Mech) 2013-14

Assignments

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ASSISGNMENT NO.-01

1) Distinguish between : I) SI & CI engine ii) 2-s & 4-s engine

2) State the assumptions made in Ideal cycle, Air standard cycle, Fuel-Air cycle & Actual

cycle. Also compare them.

3) Define scavenging and its types.

4) Draw & explain actual valve timing diagram for 4-s SI engine. Also explain factors

affecting it.

5) What is the effect of percentage change in the efficiency of Otto cycle having a

compression ratio of 8, if the specific heat at constant volume increases by 2.1%?

ASSISGNMENT NO.-02

1) With help of neat diagram explain the combustion stages in SI engine. Also explain the

variables affecting flame propagation.

2) Explain detonation and factor affecting it.

3) Explain in brief working of Battery ignition system and Magneto ignition system.

4) Explain with neat diagram the working of Simple carburetor & its accessories.

5) A 15cm*20cm four cylinder, 4-s engine running at 2500 rpm has a carburetor venturi

with a 3.5 cm throat. Determine the suction at the throat assuming volumetric efficiency

of the engine to be 75%. Assume density of air to be 1.2 kg/m3 & co-efficient of air flow

as 0.79.

ASSISGNMENT NO.-03

1) Explain the different stages of combustion in CI engine.

2) Explain knocking with help of P-Ɵ & P-V diagram & factors affecting it.

3) Explain different types of solid injection system.

4) Determine the diameter of a fuel orifice for a 4-s engine developing 20KW/cylinder

at 2100 rpm using 0.282 Kg/KWhr of fuel of 31o API. The duration of injection is 31o

of crank travel. The fuel injection pressure is 135 bars & combustion chamber

pressure is 40 bars. Take velocity co-efficient as 0.9 & � = 141.5/(131.5 + °��).

5) Explain different types of combustion chamber used in CI engine.

ASSIGNMENT NO.-04

1) What is meant by supercharging? What is its effect on engine performance?

2) A 4-cylinder, 4-s petrol engine has a compression ratio of 6. A test on this engine

gave the following results:

Net brake load = 20 Kg; Effective brake arm = 0.5 m; IMEP = 6*105 N/m2; N =

2400 rpm; Fuel consumption = 10 Kg/h; calorific value of fuel = 44000 KJ/Kg;

Cylinder bore = 86 mm; stroke = 100 mm.

Calculate : i) mechanical efficiency ii) brake thermal efficiency iii) relative

efficiency assuming engine works on constant volume cycle & that ϒ= 1.4 for air

iv) bmep.

3) In a full load test on an oil engine the following results were obtained:

i.p = 30, b.p = 24 , fuel consumption = 7.7 Kg/h , cylinder circulating water at 5.9

Kg/min with inlet & outlet temperature of 15.5 oC & 65 oC resp.; exhaust gas

calorimeter circulating water at 9.9 Kg/min with inlet & outlet temperature of

15.5 oC & 65.5 oC resp ; temperature of exhaust gas leaving calorimeter 87.8oC ;

mean specific heat capacity of exhaust gas = 1.05 ; engine room temperature =

18.4oC ; air –fuel ratio = 20 ; calorific value = 45200 KJ/Kg ; specific heat of

water = 4.2 KJ/Kg oC . Determine mechanical & indicated thermal efficiencies &

draw up the heat balance sheet on KJ/min basis.

4) During a trial on 1-cylinder, 4-s diesel engines the following observation were

recorded : bore = 340 mm ; stroke = 440 mm ; N = 4000 rpm ; Area of indicator

diagram = 465 mm2 ; Length of diagram = 60 mm ; Spring constant = 0.5 bar/mm

; Load on hydraulic dynamometer = 950 N; Dynamometer constant = 7460 ; fuel

used = 10.6 Kg/h ; calorific value = 49500 KJ/Kg ; cooling water circulated = 25

Kg/min ; increase in temperature of cooling water = 25 oC ;

Mass analysis of fuel is: C = 84 %; H2 = 15 %; Incombustibles = 1%.

Volumetric analysis of exhaust gases is: CO2 = 9 %; O2 = 10 %; N2 = 81 %.

Temperature of exhaust gases = 400 oC; specific heat of exhaust gases = 1.05

KJ/Kg oC; ambient temperature = 25 oC; partial pressure of steam in exhaust

gases = 0.030 bar; specific heat of supersaturated steam = 2.1 KJ/Kg oC . Draw

the heat balance sheet on minute basis.

ASSIGNMENT NO.-05

1) “A good CI engine fuel is a bad SI engine fuel & vice-versa”. Discuss the validity

of this statement in the light of eight factors to reduce knocking.

2) Discuss briefly the following with regard to SI engine:

i) Crankcase emission

ii) Evaporative emission

iii) Exhaust emission

3) What is diesel odour? Explain the effect of different factors on formation of diesel

odour in CI engine.

4) Distinguish between Octane no. & Cetane no. What is their significance in rating

of fuels for SI & CI engine?

5) ‘While the volatility of the fuel is determining factor in the selection of fuels for

SI engines, ignition quality of the fuel is primary deciding factor for CI engines’.

Discuss briefly the statement.

6) Write short notes on:

i) EGR

ii) Catalytic converter

iii) EURO & bharat stage norms.

ASSISGNMENT NO. -06

1) Where is dry sump lubrication preferred & why?

2) Enumerate lubrication systems & explain wet sump lubrication system with help of neat

sketch.

3) Explain briefly the following methods of water cooling:

I) Pressurized water cooling

II) Thermo-system cooling

III) Cooling with thermostatic regulator

4) Differentiate between air cooling & water cooling. Why is cooling necessary for i.c.

engines

5) Write short notes on:

I) Wankel engine

II) Stratified charge engine

III) Mist lubrication system

IV) Classification of lubricating oils.\

6) How smoke density can be measured? Describe with sketch the principle of Bosch or

Hart ridge smoke meter.



Mechanical Engineering Department Sem: VI (Rev) Sub: MACHINE DESIGN-I T.E. (Mech) 2013-14

Assignments

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ASSIGNMENT NO.1

1) What is factor of safety? Discuss various factors to be considered while selecting the factor of safety. 2) write a short note on 'Aesthetic considerations in design'. 3) Explain different modes of failure of mechanical components. 4) What are the design considerations in casting? 5) Write short note on preferred series and numbers

ASSIGNMENT NO.2

1) Design a spigot and socket type cotter joint to transmit reversible load of 50 kN. Select suitable materials and design stresses for various parts of the joint. 2) Design a turnbuckle to connect two tie rods. The pull in tie rod is 50 kN. Select suitable materials and design the turnbuckle. 3) Design a knuckle joint for a static load of 30 kN. Draw the failure diagrams. 4) Design Screw and Nut for screw press for load of 120 kN and 400 mm height adjustment. 5) A Screw Press is to be designed to exert an axial force of 30kN. a) Select suitable material and design the nut and screw. Assume the height of the screw press is to be 250 mm. b) Design the horizontal section of the frame if the axis of screw is at a distance of 250 mm from the inner end of the frame.

ASSIGNMENT NO.3

1) Write a note on Soderberg and Goodman design criteria. 2) Write on factors affecting selection of materials. 3) Discuss on various fatigue cycles. 4) Explain Fatigue Stress Concentration factor. 5). How Endurance Limit is estimated?

ASSIGNMENT NO.4

1) What are various types of keys? Explain design procedure for key.

2) A solid shaft is transmitting 40 kW at 960 rpm is supported on two bearings in apart and has two spur gears keyed on it. The pinion is having 200 mm PCD and is located 150 mm to the left of RH bearing and tangential force acts horizontally on it. The gear is having 500 mm PCD and is located 250 mm to right of LH bearing, and the tangential force acts vertically downwards on it. Select suitable material and find diameter from maximum shear stress theory and normal stress theory. 3) Write a note on Classification of coupling 4) Design a Flexible type Bush Pin coupling for the shaft transmitting 20 KW at 1440 rpm. Assume suitable material and stresses for various parts.

ASSIGNMENT NO.5 1) A semielliptical laminated spring has to carry a central load of 4000 N and consists of six leaves, two of the leaves extending to full length. The spring is having 900 mm length and central band is 80 mm wide. Select suitable material and find

(Take b/t = 4):— (i) Thickness (t) and width (b) of leaves (ii) Camber of spring (iii) Length of leaves (iv) Radius of leaves in free condition.

2) The leaf spring has 12 nos. of leave, two of which are full length. Spring support are 1.05 m apart and the central band is 85 mm wide. The central load is 5.4 kN with permissible stress of 280 MPa. The ratio of total depth to the total width is 3.

Determine – (i) Thickness and width of leaves (ii) Recommend Camber of the spring. 3) What is nipping in leaf spring? Explain with neat sketches. 4) What are the different types of springs? What are their different materials? 5) What is nipping in leaf spring? Explain with neat sketches.

ASSIGNMENT NO.6

1) What are the different stresses induced in a flat belt, derive equations for the same

2) Design Flat Belt drive with shafts and pulleys, to transmit 20 kW at 1440 rpm. The centre distance is 2.5 m and velocity ratio = 2. Select suitable materials 3) Design flat belt drive to transmit 20 kW at 960 rpm for centre distance of 2.5 m and velocity ratio 2. Permissible tensile stress for belt material is 2.4 MPa. Design both the shafts considering overhang pulleys. Decide all dimensions of C.I. Pulleys. 4) What are different stresses induce in flat belt. Derive the equation for the same.




Sem: VI (Rev) Sub: Mechatronics T.E. (Mech) 2013-14

Assignments

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Assignment No.1 : Introduction to Mechatronics

Q.1 What are Servo Mechanisms? Explain giving one example. Q.2 Home & Business applications of mechatronics system Q.3 State Advantages and Disadvantages of mechatronics. Q.4 With the help of block diagram illustrate the components of typical mechatronics system. Q.5 Define mechatronics. What are the advantages of mechatronics design over electro-mechanical design Q.6 List the paameters to be considered for designing an intelligent Mechatronics system.

Assignment No.2 : Overview of Micro Processor & Micro Controller

Q.1 Explain 8051 with functional block diagram Q.2 Explain the architecture of 8081 microprocessor with neat sketches. Q.3 How does a micro controller differ from a microprocessor? Q.4 Explain with neat sktech pin of 8051. Q.5 Explain following instruction in detail: (a) Data transfer (b) Arithmetic (c) Logical (d) Program Control Q.6 Explain microprocessor compatible D/A converter.

Assignment No.3 : Pneumatic & Hydraulic Actuation system / PLC in Automation

Q.1 Explain with neat sketches directional control valves in detail. Q.2 Draw pressure control valves: (a) Relief valve (b) Sequence valve. (c) Pressure reducing valve. (d) Pressure regulator valve. Q.3 Draw valve actuation symbols. Q.4 Draw an Electro-pneumatic control circuit for actuation of two air cylinder A and B for one movement: A+, B+, delay (10sec), B-, A- While designing the circuit suitable solenoid valve can be selected as final control valves. Q.5 Explain with neat diagram working of double acting cylinder and 5/2 pilot valve. Q.6 Explain programmable logic control in brief. Q.7 With neat diagrams explain logic functions. Q.8 Explain with neat sketches following terms: (a) Latching. (b) Sequencing. (c) Mnemonics. Q.9 Two hydraulic cylinders (Double acting) A and B, are selected for hydraulic automation. The motion sequence is as follows: A+, B+ (rapid approach), B+ (slow feed0, (AB)- Draw hydraulic circuit diagram. Q.10 Draw programmable logic diagram for the following sequence of operation: A+, Delay A-

Assignment No.4 : Control system and Its Basic Concept

Q.1 What is Mathematical Modelling? Stage advantages and limitations of Mathematical Models. Q.2 Define Stepper Motor and explain three forms of stepper motor. Q.3 Draw general block diagram of open loop and closed loop systems. Q.4 Explain feedback and feed forward system. Q.5 Define transfer function. State advantages and disadvantages of transfer function. Q.6 Describe P-I-D control.

Assignment No.5 : Transient response of a Control system

Assignment No. 6: Root Locus & Frequency Response Analysis

NCES



Mechanical Engineering Department Sem: VIII (Rev) Sub: : NCES

B.E. (Mech) 2013-14

Assignments

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Assignment 1

Q-1) List various classification of energy sources. Q-2) Explain in details limitations of conventional & non-conventional sources of energy. Q-3) Explain the existing & predicted trend of energy demand Globally & in India. Q-4) Specify the energy status of India & Maharashtra and what is the role of non-conventional energy

Assignment 2

Q-1) Define the terms a) Solar altitude angle b) Latitude c) Hour angle d) Day length e) Declination f) Solar constant Q-2) Determine the average value of solar radiation on a horizontal surface for June 22, at the latitude

of 100N, if constants a and b are given as equal to 0.30 and 0.51 respectively, and the ñ/N = 0.55

Q-3) Data for a flat plate collector used for heating the building are given below:

Factor specification Location and latitude Baroda, 220 N Day and time January 1, 11:30 – 12:30(IST) Annual average intensity of solar radiation 350 W/m2 Collectors tilt latitude + 150 No. of glass covers 2 Heat removal factor for collector 0.810 Transmittance of the glass 0.88 Absorptance of the glass 0.90 Top loss coefficient for collector 7.88 W/m2 0C

NCES

Collector fluid temperature 600C Ambient temperature 150C Calculate: (i) Solar altitude angle (ii) Incident angle (iii) Collector efficiency Q-4) what is the difference between Pyrheliometer and a pyranometer? Describe the principle of Angstrom type pyrheliometer. Q-5) what is the significance of 22nd June and 22nd December with reference to solar rays and angle of declination? Q-6) Calculate Sunshine hour angle, max. day length and monthly average of daily global solar radiations on a horizontal surface located in Ahmadabad,( 220 00’ N, 730 10’ E) for the month of April 15. Average Solar day hours are 10 hrs. Angstrom's constant for Ahmadabad a = 0.27, b = 0.49.

Assignment 3

Q-1) what are different concentrating collectors? Explain with schematic diagram Heliostats with central receiver. Q-2) Write a short note on (a) Solar photo-voltaics (b) Solar furnaces (c) Solar pond power plant (d) Solar Simulator (e) Future scope of solar energy Q-3) Explain principal of hydro power & prospects of small hydropower. Write short note on mini & micro hydel plants. Q-4) Derive an expression for maximum output fraction from wind power. A wind turbine has rotor diameter of 15m. The wing speed is 7 m/s. Assume Normal temperature and pressure of air. Energy utilization factor is 0.72; efficiency of WTG unit is 33%. Calculate the electrical power delivered. Q-5) Discuss the advantages and disadvantages of horizontal and vertical axis wind turbine.

Assignment 4 & 5

Q-1) Describe various disadvantages and operational problem associated with geothermal energy. Q-2) Explain the schematic and thermodynamic cycle of liquid dominated single flashed system geothermal power plant. Q-3) Write a brief note on prospects of Tidal energy in India. Q-4) Explain with neat sketch Tidal power plant with Double Basin arrangement. Q-5) a tidal power plant of the simple single basin type, has a basin area of 30 x106 m2. The tide has a range of 12 m. The turbine, however, stops operating when the head on it falls below 3 m. Calculate the energy generated in one filling (or emptying) process, in kilowatt hours if the turbine generator efficiency is 0.73. Q-6) Explain with neat sketch the closed or Anderson OTEC cycle.

NCES

Assignment 6

Q-1) what are the various phases of anerobic digestion in a biogas plant? Discuss them in brief. Q-2) Explain the effect of following parameters on Biogas generation: (i) Carbon – Nitrogen ratio (ii) Hydrogen Ion concentration (iii) Loading rate (IV) Retention time Q-3) what are the factors to be considered for selecting a site for a bio-gas plant? Q-4) what are principal constituent of bio-gas? What is its source? Discuss in detail the various factors affecting the biogas generation. Q-5) Describe principle of working of fuel cell. Compare advantage & disadvantages of different types of fuel cells.



Mechanical Engineering Department Sem : VIII (Rev) Sub: Automobile Engineering B.E. (Mech) 2013-14

Assignments

Assignment No. 1 Module 1: Introduction, Clutches and Transmissions Q.1 With neat sketch explain the construction, working, advantages and disadvantages of multi plate dry friction clutch. Q.2 With neat sketch explain in detail single plate dry friction clutch. Q.3 Explain Cone clutch. Q.4 Explain in detail Gear Boxes. Q.5 Write short note on non-slip differential. Assignment No. 2 Module 2: Steering and front axles, brakes Q.1 Define the following terms w.r.t. steering geometry.

i) Caster ii) Camber iii) Toe iv) King pin inclination v) Combined angle

Q.2 Explain the construction and working of Vacuum Servo Brakes. Q.3 With reference to brake shoe arrangements in drum brakes explain the following i) One leading and one trailing shoe type of arrangement. ii) Two leading shoe type of arrangement Gear box. Q.4 Draw a neat sketch and describe in detail the working of master cylinder used in Hydraulic brakes. . Q.5 What are the requirements of steering? Explain re-circulating ball type steering?

Assignment No. 3 Module 3: Suspension, Wheels and Tyres Q.1 Write short note on: i) Wishbone Suspension ii) Radial ply Tyres Q.2 What are objects of suspension? Describe Telescopic type of shock absorbor. Q.3 Why wheel alignment is necessary in automobile ? Q.4 What are the basic suspension movements ? Q.5 Explain the types of tyres. What is the importance of ignition pressure ?

Assignment No. 4 Module 4: Electrical System Q.1 Explain the principle and types of Electrical Ignition System. Q.2 Explain: The Bendix drive Q.3 Describe : Distributerless Ignition System Q.4 Explain the circuit diagram of combined current & voltage regulator . Describe its working in detail. Q.5 Explain in detail : Dynamo – (principle of operation, construction & working) .

Assignment No. 5 Module 5 : Body Engineering Q.1 Write short notes on Materials for body construction. Q.2 Explain : The load acting on chassis. Q.3 What are the types chassis. Q.4 Write short notes on overall criteria for vehicle comparison. Q.5 Write notes on layout of passengers cars, bus and trucks bodies.

Assignment No. 6 Module 6 : Recent trends in Automobile Q.1 Describe : Oxygen sensor. Q.2 Describe : i) Pressure sensor ii) Knock sensor. Q.3 Write short note on : i) Methanol sensor ii) Light sensor. Q.4 Explain : i) Manifold absolute pressure (MAP) ii) Lambda sensor. Q.5 Explain the working of engine control module.



Mechanical Engineering Department Sem: VIII (Rev) Sub: INDUSTRIAL ENGINEERING AND ERP B.E. (Mech) 2013-14

Assignments

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Assignment 1

1. Define Industrial Engineering. Briefly describe history of industrial engineering

2. Give an account of Industrial engineering approach. What is system approach to I.E.

3. Define Productivity. How productivity is measured.

4. What are all the factors related to productivity. How productivity can be improved?

5. Enlist various techniques of Industrial engineering. Give a brief description of one I.E technique.

Assignment 2.

1. Define Work study and specify the objectives and describe the steps involved in work study.

2. What is method study? Enlist various steps for conducting method study.

3. What is Work measurement and Time study? Explain in detail the time study, equipments used

and the outcome of time study.

4. What are the objectives of Ergonomics? Explain how productivity can be improved by applying

the principles of ergonomics.

5. What is performance rating and standard time? What are micro motion studies?

Assignment 3

1. Define Value Engineering. Explain why Value Engineering is important.

2. Differentiate Value engineering and Value analysis. Give details.

3. Enumerate the steps involved in applying Value engineering along with details.

4. Describe how you can apply Value engineering for a product of your choice.

5. What is FAST. What are all the strengths and weaknesses of VE.

Assignment 4.

1. Describe the purpose of inventory control. Give two deterministic models of inventory control.

2. What are control charts for variables and attributes? Enlist various tools used for quality control.

3. What are the factors involved in locating the plant. Give different types of plant layout used in

manufacturing.

4. Define Quality. What is 6 sigma and TQM?

5. What is importance of waste management in industry? What is JITS?

Assignment 5

1. Explain Lean and agile manufacturing?

2. Describe evolution of MRP to ERP.

3. Differentiate between ERP and BPR. Explain how SCM and ERP are connected.

4. Discuss the need for computers in industrial engineering. Explain the role of computers for

productivity.

5. What are the advantages of integrated system design in industrial engineering.

Assignment 6

1. What is ERP? What are the benefits of using ERP?

2. Give the architecture of ERP. Give a brief account of evolution of ERP.

3. Enlist various functional modules of ERP. Give a brief account of any one module.

4. What are steps involved in implementing for ERP? How can we avoid the pit falls?

5. What is extended ERP? What are the latest trends in ERP?

Industrial Engineering Assignment Problem

1. A work sampling study conducted to establish standard time for an operation

The observation of study is as follows:

a) Total no of observation – 160

b) Manual work observation- 14

c) Machine controlled work observation- 106

d) Machine idle time observation- 40

Average Performance Rating- 85%

No of Parts Produced-40

Allowance for personal need and fatigue-10%

Study conducted for three hours.

Available working hours /day-8hrs

Calculate Standard Time

2. The number of rust spots found in each sample of sheet metal of 1 sq.ft area is noted down as

follows. Draw the appropriate control chart and state if the process is in control or not.

Sample No. 1 2 3 4 5 6 7 8 9 10

Defects No. 7 9 6 9 5 8 7 10 8 6

3. The following data was observed for a sample size of 200 pieces for 20 days.

Determine whether the data exhibits the statistical control limits or not. Evaluate preliminary and

revised control limits

Lot No Defective Lot No Defective

1 10 11 21

2 15 12 25

3 10 13 8

4 12 14 14

5 11 15 4

6 9 16 10

7 22 17 11

8 4 18 11

9 12 19 26

10 24 20 13

4. During manufacture of a part, certain quality characteristics were me ∑X bar =360.4

∑ R bar =8.82. Subgroup size is 6 and there are 26 subgroups. If the specification limits are 14.0

± 0.42 and if th process is control. Calcualte: (1) Process Capability (2) Control limits on X bar

and

R bar charts . (3) Comment on process is in control or not.

Given: n=5, A2= 0.58, D3= 0, D4=2.11, d2=2.326

5.The observed times and the performance rating for five elements are given. Calculate the

standard time assuming personal allownce and rest as 15%. and contingency allowance as 4% of

the basic time.

Element Observed time, Min Rating

1 0.2 85%

2 .08 80%

3 0.5 85%

4 0.14 90%

5 1.2 80%

6. A company intends to set up an assembly line to produce 400 parts per 8 hours shift. The

information regarding time and immediate predecessors are given below:

Work

Element

Time Immediate Predecessors

A 45 None

B 75 A

C 30 D,E,F

D 20 B

E 25 B

F 15 A

G 125 A

H 140 G

I 125 H

J 120 C,I

(1) Draw precedence diagram

(2) Find desired cycle time

(3) Calculate theoretical no. of stations.

7. Explain the heuristic method of line balancing for the following data:

Steps or incremental

task

Immediate

Predecessor

Duration of the task , min.

1 ----- 3

2 ------ 4

3 1 2

4 2 5

5 3 4

6 5 8

7 4 2

8 6 4

9 8 6

(1) Draw precedence diagram (2) Minimum no. of Work Stations

(3) Balancing efficiency

Given: The maximum time available at any work station is 10 minutes.

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