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15 Νοε 2013 (πριν από 3 χρόνια και 9 μήνες)

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QUESTION BANK

ME09 601

DYANAMICS OF MACHINERY

PART A

1.

What are the different methods used in static force analysis?

2.

What do you mean by static force analysis?

3.

What is the importance of static force analysis?

4.

Write the comparison between static force and
dynamic force analysis

5.

Explain the

principle of superposition.

6.

What are the conditions for dynamically equivalent system?

7.

What is the importance of turning moment diagrams in flywheel analysis?

8.

What are the functions of a flywheel?

9.

W
hat is coefficient of s
teadiness
?

10.

Explain the terms static and dynamic balancing.

11.

What do you mean by free body diagrams?

12.

What are the uses of turning moment diagrams?

13.

Explain D’Alem
bert’s principle.





PART
-
B


14.

Explain the principle of virtual work with an example

15.

Explain the procedure of drawing free
body diagrams

16.

Derive an expression for velocity and acceleration of piston.

17.

Derive an expression for angular velocity and acceleration of the connecting rod.

18.

In a slider crank mechanism the length of crank and connecting rod are100mm and
400mm respectively
. The crank rotates at 600rpm clockwise when the crank turns
through45
°
from the IDC find the velocity and acceleration of the slider, angular
velocity and angular acceleration of the connecting rod.

19.

The length of a connecting rod of an engine is 500mm meas
ured from the centres and
its mass is 18 Kg . The centre of gravity is 425mm from the top of small end bearing
and the small end bearing radius is 100mm. determine the dynamically equivalent
system keeping the mass at small end. The frequency of oscillatio
n of the connecting
rod when suspended from small end is0.7166 Hz.

20.


A flywheel fitted to a steam engine has a mass of 1000 kg and radius of gyration 350
mm. The starting torque of the engine is a constant which is equal to 580 Nm. Find
the kinetic energy o
f the flywheel after10 seconds.





PART
-

C


21.

A vertical petrol engine100 mm diameter and 120mm stroke
has a connecting rod
250mm long. The mass of the piston is1.1 Kg. The speed is 2000 r. p.m. On the
expansion stroke with a crank 20° from the TDC, the gas pressure is 700KN/m
2
.
Determine

i.

Net force on the piston

ii.

Resultant load on the gudgeon pin

iii.

Thrust on
the cylinder walls

iv.

Speed above which the gudgeon pin load would be reversed in direction

22.


a.

Derive an expression for energy stored in a flywheel.

b.

Derive an expression for velocity and acceleration of the piston.


23.

The crank and connecting rod of reciprocating

engine is 200mm and 700mm
respectively. The crank is rotating in clockwise direction at 120 rad/s. Find the help of
Klein’s construction

i.

Velocity and acceleration of the piston.

ii.

Angular velocity and angular acceleration of the connecting rod.

iii.

Velocity an
d acceleration at the midpoint of connecting rod.

24.

Explain the conditions and equations of a dynamically equivalent system of masses

25.

For the static equilibrium of the mechanism find the required input torque.
Dimensions are, AB=150mm, BC=AD=500mm, DC=300MM

CE=100mm and
EF=450mm. the load on the piston is
F=
250 N.




















ME09 602


FINITE ELEMENT METHODS

MODULE I

2 Marks

1.

What is the need of Finite Element Analysis?

2.

List out the Software packages available in market for FEA.

3.

What are meant by
structural and non
-
structural problems?

4.


Give the FE equation for the stiffness matrix of a One
-
Dimensional Bar Element.

5.

Give the FE equation for the stiffness matrix of a One
-
Dimensional Circular shaft
subjected to torsion.

6.

Give the FE equation for the st
iffness matrix of a One
-
Dimensional Beam Element.

7.


Give the FE equation for the stiffness matrix of a One
-
Dimensional Heat
Conduction problem.

5 Marks


1.

What is a shape function? State its characteristics.

2.

What is meant by displacement function?

3.

Express the

functions of a one
-
Dimensional element.

4.

Explain the properties of stiffness matrix.

5.

Explain Local and Global Co
-
Ordinates.

6.

Explain the bandwidth of the stiffness matrix.

7.

Describe the assemblage of elementary equations in FEM to obtain overall
equilibrium
equations.

8.

What is meant by Pre
-
Processing and its importance in FEM?

9.

What are the major applications of FEM?

10.

What are the Advantages and Disadvantages of FEM?


10 Marks


1.

Explain with suitable example, the basic steps involved in finite element analysis
of
a structural problem.

2.


Derive the Elemental stiffness matrix and load vector for two noded element.

3.

Axial load P= 800 × 10
3
N is applied at 30˚c to rod as shown in Fig.1. The
temperature is raised to 70
˚
c.


a.

Assemble K and F matrices.

b.

Determine nodal disp
lacement and element stress.

E
1
= 95× 10
9
N/m
2




E
2
= 225× 10
9
N/m
2

A
1
= 1200 mm
2





A
2
= 1500 mm
2

α
1
= 38 × 10
-
6
per ˚c




α
2
= 27 × 10
-
6
per ˚c

4.

Find the stress distribution in the tapered bar shown in Fig.2 below using finite
elements under an axial load of

P= 10 Kg.

Cross sectional area at root= 2 cm
2


Cross sectional area at end= 1 cm
2


Young’s Modulus = 2 × 10
6
Kg/cm
2


5.

A composite slab consists of three materials of different thermal conductivity ie,
20 W/m˚K, 30 W/m˚K, 50 W/m˚K

of thickness 0.3m, 0.15m, 0.15m respectively.
The outer surface is 20 ˚c and the inner surface is exposed to the convective heat
transfer co
-
efficient of 25 W/m
2

K at 300
˚
c. Determine temperature distribution
within the wall.

6.

Brick wall of thickness L= 80
cm, k= 0.8 W/m˚C. The inner surface is 38˚c and the
outer surface is exposed to cold air at
-
10
˚
c. The heat transfer co
-
efficient associated
with outer surface is h= 64 W/m

c. Fig.3. Determine the steady state temperature
distribution within the wall and

also heat flux through the wall.

7.

Calculate the deflection at the center of the beam as shown in Fig.4.
Take E= 220 GPa, Area, A= 40 mm × 40 mm.

8.

Consider a brick wall(0.7 W/Mk) of thickness 30 cm. The inner surface is at 28˚c
and the
outer surface is exposed to cold air with heat transfer co
-
efficient of 36
W/m
2

K at
-
15
˚
c. Determine the steady state temperature distribution and heat flux
through the wall.

9.

Determine the angle of twist in degrees at the step, the maximum shear stress in

each
section, and the reactions at the walls for the stepped circular bar shown in Fig.5.

10.

A stepped bar is subjected to an axial load of 200KN at the place of change of cross
section and material as shown in Fig.6.

Find

a.

The nodal displacements.

b.

The react
ion forces

c.

The induced stress in each material.

(1)

Aluminium Bar

A
1
= 2400 mm
2




A
2
= 600 mm
2




E
1
= 70 × 10
3

N/mm
2



E
2
= 200 × 10
3

N/mm
2


11.

For the bar assemblages shown in Fig.7, determine the nodal displacements, the
forces in each element and the reactions.

E=70 GPa, A= 2 × 10
-
4
m
2
, k = 2000 KN/m.

12.

For the beam shown in Fig.8, compute slope at the hinged support points, E= 200
GPa, I= 4 × 10
-
6
m
4
. Use two beam elements.



MODULE II

2 Marks

1.

Give the Finite Element formulation for a plane truss element.

2.

What is

meant by co
-
ordinate transformation?

3.

What is the difference between Local and Global Co
-
Ordinates?

4.

What are the advantages of local co
-
ordinate system over global co
-
ordinate
system?

5.

What are the Lagrangian Interpolation functions?

6.

Why is 3
-
Noded triangu
lar element called as CST Element?

7.

Give the Finite Element Equation for a two noded Truss Element.


5 Marks


1.

Explain the different co
-
ordinate transformations in FE modeling.

2.

Explain Constant Strain Triangle.

3.

Derive the strain
-
displacement matrix for a CS
T Element.

4.

Derive the stiffness equation for a two dimensional element.

5.

Differentiate between CST and LST elements.

6.

Define plane stress and plane strain problems with suitable examples.

7.

Discuss the difference between the use of linear triangular elements a
nd bilinear
rectangular elements for a 2D domain.


10 Marks


1.

Obtain the element stiffness matrix of a plane truss with importance in properties of
global stiffness matrix K.

2.

Derive the shape functions of a constant strain triangular element.

3.

Explain the
effects of local and global co
-
ordinates of plane truss and derive the
transformation matrix.

4.


Consider the truss element as given in Fig.9. The x,y co
-
ordinates of the two nodes
are indicated in figure. If U=[ 1.8, 1.3, 2.4, 4.6]
T

× 10
-
2

inch, determine

i)

The vector U
I

ii)

Stress in element

iii)

K matrix

Given E= 80×10
6

psi



A= 4.1 inch
2

5.

What are the factors to be considered for FE idealization? Define triangular element
with figure and obtain displacement in terms of nodal displacement and strain in
terms of disp
lacement.

6.

The co
-
ordinates of the nodes 1,2 and 3 of a triangular element are (1,1), (8,4) and
(2,7) in mm. The displacements at the nodes are u
1
= 1mm, u
2
= 3mm, u
3
=
-
2mm,
v
1
=
-
4mm, v
2
= 2mm and v
3
= 5mm. Obtain the strain displacement relation matrix B
an
d determine the strains Ɛ
x
, Ɛ
y
and γ
xy.















ME 09 603

MACHINE DESIGN I


PART A (2 MARKS)

MODULE 1

1.

What is meant by hole basis system and shaft basis system?

2.


What is meant by stress concentration? How do you take it into consideration in case
of a component subjected to dynamic loading?

3.

What do you mean by factor of safety?

4.

What is meant by theoretical stress concentration factor?

5.

What is meant by fatigue stre
ss concentration factor?

6.

What is meant by unilateral tolerance and bilateral tolerance?

7.

List the important factors that influence the magnitude of factor of safety?

8.

What is meant by working stress and how it is calculated from the ultimate stress or
yield
stress of a material? What will be the factor of safety in each case for different
types of loading?

9.

What is meant by endurance strength of a material? How do the size and surface
condition of a component and type of load affect such strength?

10.

Write Soderb
erg’s equation and state its application to different types of loadings?

MODULE II

11.

What do you understand by single start and double start threads?

12.

Define the following terms:

13.

Major diameter (ii) Minor diameter (iii) Pitch (iv) Lead

14.

Bolts less than M16
should normally be used in pre loaded joints. Comment

15.

Discuss on bolts of uniform strength giving examples of practical applications of
such bolts

16.

Explain the different types of threaded fasteners?

17.

Explain the different types of keys with neat sketch and i
ts applications?

18.

What are the design considerations in designing a bolt of a pressure cylinder cover?

19.

What are the assumptions made in design of riveted joints

20.

What is Woodruff key? Give its applications?

21.

Describe the purpose of gib in cotter joint. What a
re the applications of cotter joints?


PART B (5 MARKS)

MODULE I

22.

Explain different steps in design process?

23.

What are the different types of fits?

24.

Explain the methods to reduce stress concentration?

25.

Define the terms:

26.

Allowance, (ii) Basic size, (iii) Clear
ance, (iv) Upper deviation, (v) Tolerance zone

27.

Define the terms:

28.

Creep, (ii) Fatigue, (iii) Stiffness, (iv) Resilience, (v) Toughness

29.

What is meant by Brittleness, Hardness and Plasticity? Why brittleness is undesirable
property for materials to be used fo
r machine parts?

30.

A journal of nominal size of 70 mm runs in a bearing with close running fit. Find the
limits of shaft and bearing. What is the maximum and minimum clearance?

31.

Calculate the tolerances, fundamental deviations and limits of sizes for the shaft
designated as
60 H8/ f7

MODULE II

32.

What do you mean by efficiency of riveted joint?

33.

An eye bolt is to be used for lifting a load of 60 kN. Find the nominal diameter of the
bo
lt, if the tensile stress is not to exceed 100MPa. Assume coarse threads.

34.

Determine the safe tensile loads for bolts of M20 and M 36. Assume the bolts are not
initially stressed and take the safe tensile stress as 200MPa.

35.

An engine cylinder is 300 mm in di
ameter and the steam pressure is 0.7 N/mm
2
. if the
cylinder head is held by 12 studs, find the size? Assume safe tensile stress as 28MPa.

36.

Find the size of 14 bolts required for a C.I. steam engine cylinder head. The diameter
of the cylinder is 400 mm and
the steam pressure is 0.12 N/mm
2
. Take the
permissible tensile stress as 35MPa.


PART C (10 MARKS)


MODULE I


37.

A steel rod is subjected to a reversed axial load of 170 kN. Find the diameter of the
rod for a factor of safety of 2. Neglect column action. The
material has an ultimate
tensile strength of 940 MPa and yield strength of 850 MPa. The endurance limit in
reversed bending may be assumed to be one
-

half of the ultimate tensile strength.
Other correction factors may be taken as follows: For axial loading

=0.7; For
machined surface = 0.8;


For size = 0.85; for stress concentration = 1





38.

A hot rolled steel shaft is subjected to a torsional load varying from 320 Nm
clockwise to 150 Nm counterclockwise and to a bending moment at a critical section
varying f
rom 400 Nm positive to 250 Nm negative. The shaft has uniform cross
section and no keyway is present at the critical section. Determine the required shaft
diameter assuming

σ
u

= 400 N/mm
2
, σ
y

= 350 N/mm
2

and n=2







39.

A circular bar of 500 mm length is supported freely at its two ends. It is acted upon
by a central concentrated cyclic load having a minimum value of 20 kN and a
maximum value of 70 kN. Determine the diameter of the bar by taking a factor of
safety of 2, s
ize effect of 0.8, surface finish factor of 0.85.The material properties of
bar are given by: ultimate strength of 600MPa, yield strength of 500MPa, and
endurance strength of 370 MPa.










40.

A machine part of 16mm diameter is made of Alloy Steel. It is s
ubjected to a bending
moment of 100 Nm, a torque of 50 Nm and an axial pull of 5 kN. Estimate the factor
of safety based on Max. Normal stress, Max. Shear stress and Max. Distortion energy
theories. Assume yield tensile strength for the material is 500 MPa
.

MODULE II

41.

A shaft and a key are made of the same material and the key width is one fourth of
the shaft diameter. Consider shear only, determine the minimum length of the key in
terms of shaft diameter. The shearing strength of the key material is 60% of

its
crushing strength. Determine the thickness of the key equally strong in shear and
crushing

42.

A locomotive boiler of 1.8 m internal diameter is required to generate steam at 1.4
MPa guage. Calculate the thickness of the shell plate and design the triple
riveted
longitudinal double butt strap joint with unequal straps. Use the following data:

σ
t

= 77MPa,τ = 60 MPa , σ
c

= 135 MPa. Efficiency of triple
-

riveted longitudinal butt
joint is 84%

43.

Design a cotter joint to withstand an axial load varying from 20 k
N in tension to 60
kN in compression. The allowable stresses for the steel used in the joint are 50 MPa
in tension; 70 MPa in crushing; 40 MPa in shear.

44.

The cylinder head of a steam engine is subjected to a steam pressure of 0.7 N/mm
2
. It
is held in positi
on by means of 12 bolts. A soft copper gasket is used to make the
joint leak
-
proof. The effective diameter of cylinder is 300 mm. find the size of the
bolts so that the stress in the bolt is not to exceed 100MPa.


































ME 09 604

OPERATIONS RESEARCH

(2 Mark questions)


1.

Define slack, surplus and artificial variable related to linear programming.

2.

What is assignment problem in operations research?

3.

What is transportation in operation research?

4.

State the principle of optimality in your
own words.

5.

What is mean by linear programming

6.

Define feasible and optimal solutions

7.

Write the mathematical formulation of a transportation problem

8.

Explain the statement “The dual of a dual is primal”

9.

Define objective function and constraints

10.

What are the
unbalanced assignment problem ? How are they solved?



(5 Mark questions)


1)A transport company has two types of trucks, Type A and Type B. Type A has a
refrigerated capacity of 20m
3

and a non refrigerated capacity of 40m
3

while Type B has
the same overal
l volume with equal sections for refrigerated and non refrigerated
stocks.A grocer needs two hire trucks for the transport of 3000m
3

of refrigerated stock
and 4000m
3

of non refrigerated stock.The cost per kilometer of a Type A is

30 and $40
for Type B. H
ow many trucks of each type should the grocer rent to achieve the minimum
total cost?


2. With the start of school approaching, a store is planning on having a sale on school
materials .They have 600 note books,500 folders and 400 pens in stock,and they pl
an on
packing it in two different forms.In the first package,there will be 2 note books,1 folder
and 2 pens and in the second one 3 note books,1 folder and 1 pen.The price of each
package will be $ 6.50 and $ 7 respectively. How many packages should they
put
together of each type to obtain maximum benefit?


3) Reformulate the problems in to standard form:

Minimise z = 2x
1

+x
2
+4x
3

subject to


-
2x
1
+4x
2





x1+2 x2+x
3





2x
1
+3x
3





x
1,
x
2


,x
3

unrestricted in sign

4) Write the dual of the following LPP


Maximise z = 2x
1

+5x
2
+3x
3

subject to




2x
1
+4x
2
-
3x
3




-
2x
1
-
2 x
2
+3x
3






x
1
+3x
2
-
5x
3





4x
1
+x
2
+3x
3




5)Difference

between Big

M method and two phase method.


6)Difference between transportation problem and an assignment problem.


7) Solve the following transportation problem using VAM






Source


Destination


D
1

D
2

D
3

D
4

Supply

S
1

5

12

6

10

300

S
2

7

8

10

3

400

S
3

9

4

9

2

300

Demand

200

300

450

250





8) The assignment cost of assigning any one operator to any one machine is given below
.Find optimal assignment.







I II III IV


A 10 5 13 15


B 3 9 18 3


C 10 7 3 2



D 5 11 9 7

9)Briefly explain two phase method.


10)Find any two basic feasible solution of the LPP

Maximise z=5x+ 3y


subject to x+ 2y



3x+y



,x,y




11)Solve the following using graphical method


Maximise z=9x+10y
subject to

11x+9y




7x+12y



6x+16y




x,y




12) Solve the following LPP by simplex method


Maximize z= 10 p+16q+8r subject to

p+2q+r




2p+q+3r




P,q,r




(10 Mark questions)


1.Solve the following LPP by two phase method

Minimize

z= 7 p+8q+5r subject to

p+2q+r





2p+q+3r



P,q,r



2.Solve the following LPP by Charne’s Method

Minimize z = p+3q+2r subject to

2p+q
-

r





p+2q+r



P,q,r



3) Solve the following transportation problem using stepping stone method


Plant


Destination

Availability/

Month


1

2

3

4


A

5

10

12

5

100

B

2

3

4

3

40

C

10

12

11

13

90

Requirement








4)The

company manufacturing air coolers has two plants located at and Kolkata with a
capacity of 2000 and 100 units respectively. Company supplies air coolers to its 4 show
rooms situated at Ranchi, Delhi, Lucknow and Kanpur which has demand of 75
,100,100and

30 units respectively.The cost of transportation per unit in Rs is shown in
the following table



Ranchi

Delhi

Lucknow

Kanpur

Mumbai

90

90

100

100

Kolkata

50

70

130

85


Plan the production program so as to minimize the total cost of transportation
using U
-
V
method.


6. Explain the main steps in U V method in solving a transportation problem.


7. Explain stepping stone algorithm.


8. How to reduce a feasible solution to basic feasible solution ? Explain with an example.


9.Explain the inequality con
straints, degeneracy and assignment problems in transportation.


10. A firm makes two products X and Y and has a total production capacity of 9 tons per
day, X and Y requiring the same production capacity. The firm has a permanent contract to
supply a
t least 20 tons of X and at least 3 tons of Y per day to another company. Each ton of
X requires 20 Machine hours production and each ton of Y requires 50 machine hours
production time. The daily maximum possible number of machine hours is 360.All the fir
st
output can be sold and the profit made is Rs.80 per ton of X and Rs. 120 per ton of Y. It is
required to determine schedule maximum profit and calculate this profit.


11) Let x=2,y = 4 , z= 1 be a feasible solution to the system of equations

2x
-
y+2z =
2

X+4y= 18


reduce a feasible solution to basic feasible solution?


12)What do you mean by transportation problem? Explain various types of transportation


problems and its different practical application?


13)Find

the basic feasible solution of the following transportation problem. Also find the
optimal


transportation plan.




I


Destination

II

III

IV

V

Available

A

4

3

1

2

6

80

B

5

2

3

4

5

60

C

3

5

6

3

2

40

D

2

4

4

5

3

20

Demand

60

60

30

40

10




14
)Show that the assignment problem is a special case of the transportation problem. Why is
the transportation method to find the optimal solution not preferred in the assignment
problem?
















ME 09 605

COMPUTER INTEGRATED MANUFACTURING

2 Marks

1.

What is machining?

2.

Distinguish between NC and CNC.

3.

Write the applications of NC.

4.

Describe briefly the open loop system.

5.

List the advantages of NC.

6.

Explain special tool holders used in CNC machines.

7.

Describe the point to point systems.

8.

Describe the contouri
ng systems.

9.

Describe the incremental programming.

10.

Explain fundamentals of NC.

11.

Explain preparatory functions.

12.

Explain miscellaneous functions.

5 Marks

1.

Describe briefly closed loop system.

2.

Distinguish between point
-
to
-
point and contouring systems.

3.

List the
advantages of NC.

4.

Describe the difference between incremental and absolute systems.

5.

Briefly describe the tool holders in CNC machines.

6.

Describe briefly post processor.

7.

Explain design considerations of NC machine tools.

8.

Explain manual part programming.

9.

Desc
ribe briefly the post processor commands in APT.

10.

Explain automatic programmed tools.


10 Marks

1.

Describe briefly on methods of improving machine accuracy of CNC machines.

2.

Describe features of incremental and absolute systems with one example.

3.

Explain design

considerations of NC machine tools.

4.

Explain the working of post processor technology.

5.

Explain briefly the fixed block word address format in part programming with
suitable example.

6.

Explain briefly the open loop and closed loop systems.

7.

Explain the classif
ication of numerical control systems.

8.

Distinguish between manual and computer aided part programming.

9.

Explain the step involved in computer aided part programming.

10.

Describe briefly on methods of increasing productivity in CNC machines
.




ME 09 606

INDUSTRIAL MAINTENANCE

2 Marks questions

Module
-
1

1.

Discuss the elements of preventive maintenance.

2.

Enumerate and define the various types of maintenance.

3.

Define maintenance.

4.

Explain about breakdown maintenance.



Module
-
2

1.

What are the various methods or
techniques employed for corrosion monitoring?

2.

Define proximity analysis with reference to vibration monitoring.


5 Marks questions

Module
-
1

1.

Write a short note on inspection.

2.

Explain plant maintenance.

3.

Explain types of maintenance.

4.

Explain transducer select
ion.

5.

What are the advantages of preventive maintenance?

6.

What are the advantages of condition based maintenance.

7.

Distinguish between preventive maintenance and predictive maintenance.

8.

Write short notes on predictive maintenance.

9.

What are the advantages of
preventive maintenance over breakdown maintenance?


Module
-
2

1.

Explain machine signature.

2.

Explain shock pulse method.

3.

Write
note on performance trend monitoring.

4.

Explain proximity analysis.

5.

What is accelerometer?

6.

Explain vibration analysis techniques.

7.

Explai
n vibration severity charts.

8.

Explain benefits of vibration monitoring.


10 Marks Questions

Module
-
1

1.

Explain the purpose, functions and types of maintenance.

2.

Explain various types of transducer used in vibration monitoring.

3.

Explain briefly the procedure of
preventive maintenance.

4.

Explain various condition monitoring techniques.

Module
-
2

1.

Explain performance trend monitoring.

2.

Explain vibration signature analysis for condition monitoring of ball and roller
bearing.

3.

Explain frequency and spectral analysis with
an example.

4.

Explain in detail about any one method of condition monitoring of ball and roller
bearing.

5.

Explain shock pulse method to test antifriction bearing.

6.

Briefly explain the causes of machine vibration.

7.

Explain various types of vibration monitoring/m
easuring equipment.