2012 - content.kopykitab.com · i) For an underdamped system, motion is a) exponentially decreasing b) oscillatory c) non-oscillatory d) aperiodic. ii) Damping ratio (ζ) is defined

Name : ……………………………………………………………

Roll No. : ………………………………………………………...

Invigilator's Signature : ……………………………………….

CS/B.Tech /ME(N)/TT(N)/APM(N)/PE(N)/BT(N)/SEM-5/HU-511/2012-13

2012PRINCIPLES & PRACTICES OF MANAGEMENT

Time Allotted : 3 Hours Full Marks : 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A( Multiple Choice Type Questions )

1. Choose the correct alternatives for any ten of the following :

10 1 = 10

i) ‘MBO’ is known as

a) management by objectives

b) marketing by objectives

c) management by order

d) none of these.

ii) Who professed the ‘Hygiene theory of motivation’ ?

a) Abraham Maslow b) Philip Kofler

c) Herzberg d) Douglas McGregor.

iii) Who is the father of ‘Human Relation Approach’ ?

a) Elton Mayo b) Douglas McGregor

c) Mary Parker Follet d) None of them.

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iv) The objective of marketing management is

a) to increase profile

b) to increase sales value

c) to increase customer satisfaction

d) none of these.

v) Productivity is the

a) output-input ratio b) input-output ratio

c) both of these d) none of these.

vi) ‘Scientific management theory’ is advocated by

a) F.W. Taylor b) Max Weber

c) F. Galbreth d) Henry Fayol.

vii) ‘Johari Window’ is a model related to

a) leadership

b) controlling management function

c) personality traits and communication

d) none of these.

viii) Recruitment comes

a) after selection b) before selection

c) after training d) after interview.

ix) ‘Division of work’ promoters

a) specialisation b) wastage

c) inefficiency d) confusion.

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x) Management process is compared to

a) planning b) organising

c) staffing d) none of these.

xi) Networking capital is equal to

a) fixed assets – share capital

b) bill receivable – bills payable

c) current assets – current liabilities

d) sundry debtors – sundry creditors.

xii) Basic objective of financial management is

a) profit maximisation b) wealth maximisation

c) both of these d) none of these.

GROUP – B( Short Answer Type Questions )Answer any three of the following. 3 5 = 15

2. a) What is delegation ?

b) State its significance. 2 + 3

3. a) What is the importance of motivation ?

b) What are the functions of a leader ? 2 + 3

4. Explain how Pareto & Gantt chart can help in production

control.

5. What is a decision ? How information technology can be

used for decision making ?

6. State the relationship between authority and responsibility.

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GROUP – C( Long Answer Type Questions )Answer any three of the following. 3 15 = 45

7. a) Describe the process of communication with the help of

diagram.

b) What are its major barriers ?

c) Explain the importance of ethics in business. 5 + 5 + 5

8. a) Explain the steps in organising.

b) What are the steps in departmentation ?

c) Discuss the factors to be considered in choosing

departmentation. 5 + 5 + 5

9. What is marketing ? Distinguish between marketing and

selling. 5 + 10

10. Elaborately discuss the differences between the scientific

school approach and behavioural school approach of

management.

11. Write short notes on any three of the following : 3 5

a) Marketing mix

b) Working capital

c) Types of leadership

d) Hawthorne experiment

e) Work study.

5314 (N ) 4

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Name : …………………………………………….………………

Roll No. : …………………………………………...……………..

Invigilator’s Signature : ………………………………………..

CS/B.TECH (ME/PE)(N)/SEM-5/ME-501/2012-13

2012

DYNAMICS OF MACHINES Time Allotted : 3 Hours Full Marks : 70


Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A

( Multiple Choice Type Questions )

1. Choose the correct alternatives for any ten of the following :

10 × 1 = 10

i) For an underdamped system, motion is

a) exponentially decreasing

b) oscillatory

c) non-oscillatory

d) aperiodic.

ii) Damping ratio )( ζ is defined as

a) CCc / b) cCC /

c) cCC × d) 2)/( cCC .


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iii) Logarithmic decrement )( δ is defined as

a) )/( 1 nn xxln+

=δ b) )/( 1+=δ nn xxln

c) )/(2 1+=δ nn xxln d) )/( 121

+=δ nn xxln .

iv) If the ball masses of a governor have same equilibrium

speed for all the radii of rotation, it is said to be

a) stable b) hunting

c) isochronous d) sensitive.

v) The Proell governor as compared to Porter governor, at

same speed

a) is more sensitive b) requires smaller size

c) less lift d) all of these.

vi) The ratio of connecting rod length to crank radius is

kept large in locomotives to

a) minimize primary forces

b) minimize secondary forces

c) enable starting of locomotive in any position

d) achieve complete balancing.


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vii) In a spring mass system with k = stiffness of spring,

M = main mass and m = mass of the spring, the natural

frequency is given by

a) mM

k+

rad/s b)

2mM

k

+ rad/s

c)

3mM

k

+ rad/s d)

mMk+

3 rad/s.

viii) In a free vibration the acceleration vector leads the

displacement vector by

a) 2π b) π

c) 32π d) π2 .

ix) The maximum fluctuation of energy in a flywheel is

equal to

a) )( 21 ω−ωωI b) CsI 2ω

c) ECs2 d) all of these.

x) A torsional vibratory system having n rotors connected

by a shaft has

a) n nodes b) ( n + 1 ) nodes

c) ( n – 1 ) nodes d) ( n + 2 ) nodes.


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xi) The axis of spin, the axis of precesion and the axis of

gryoscopic torque are in

a) two perpendicular planes

b) three perpendicular planes

c) three parallel planes

d) none of these.

xii) Resonance is a phenomenon in which the frequency of

the existing force is ................... to the natural

frequency of the system.

a) equal b) half

c) double d) triple.

GROUP – B ( Short Answer Type Questions )

Answer any three of the following 3 × 5 = 15 2. What do you mean by whirling of shafts ? What is whirling or

critical speed ? Explain.

3. A vibrating system having mass 1 kg is suspended by a

spring of stiffness 1000 N/m and it is put to harmonic

excitation of 10 N. Assuming viscous damping, determine

(a) the resonant frequency, (b) the amplitude at resonance.

4. What is critical speed of a rotating shaft ? Prove that the

whirling speed of a shaft in rps is given by the relation

δ⋅= /49850cN .



5. A mass is attached to a shaft which is rotating at an angular

speed of ω rad/s. Describe the procedure of balancing this

mass by (i) a single mass only, (ii) two masses in different

planes.

6. What do you understand by gyroscopic couple ? Derive a

formula for its magnitude.

GROUP – C ( Long Answer Type Questions )

Answer any three of the following. 3 × 15 = 45

7. a) Deduce the expression for Logarithmic decrement.

b) Find the damping factor of a vibrating system which

consists of a mass of 3·5 kg, a spring of stiffness

2·5 N/mm and a damper of damping coefficient

0·018 N/mm/s. What is the natural frequency of

damped vibration ? Also find the ratio of frequencies of

damped and undamped vibrations and the periodic time

of damped vibrations. 3 + 12

8. a) Deduce the expression for the effort of the Porter

governor.

b) The mass of each ball in a Wilson-Hertnell type of

governor is 2·5 kg. The length of ball arm of each ball-

crank lever is 100 mm whereas the length of the sleeve

arm of bell-crank leaver is 80 mm. The min equilibrium

speed is 200 rpm, when radius of rotation is 100 mm.

When the sleeve is lifted by 8 mm, the equilibrium

speed is 212 rpm. The stiffness of each of the springs


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connected to the balls is 200 N/m. The lever for the

auxiliary spring is pivoted at the midpoint. Find the

stiffness of the auxiliary spring. 5 + 10

9. a) An inside cylinder locomotive has its cylinder centre

lines 7 m apart and has a stroke of 6 m. The rotating

masses per cylinder are equivalent to 1471·5 N at the

crank pin, and the reciprocating masses per cylinder to

1765·8 N. The wheel centre lines are 1·5 m apart. The

cranks are at right angles. The whole of the rotating and

32 rd of the reciprocating masses are to be balanced by

weights placed at a radius of 6 m. Find the magnitude

and direction of the balancing weights. Also find the

fluctuating in rail pressure under one wheel, vibration

in tractive efforts and the magnitude of swaying couple

at a crank speed of 300 r.p.m.

b) Explain the term 'Partial balancing of primary force'.

Why is it necessary ? 1 2 + 3

10. a) For a high speed rotating shaft carrying a number of

masses in different planes, put down the problems may

appear if the system is completely unbalanced.

b) A shaft carries four rotating masses A, B, C and D in

this order along its axis. The mass A may be assumed

concentrated at a radius of 150 mm, B at 120 mm, C at

140 mm and D at 180 mm. The masses of A, C and D

are 15 kg, 10 kg and 8 kg respectively. The planes of

revolution of A and B are 150 mm apart and of B and C



are 180 mm apart. The angle between A and C is 90°. If

the shaft is in complete dynamic balance, determine

i) the angle between the radii of A, B and A, D

ii) the distance between the planes of revolutions of C

and D and

iii) the mass B. 3 + 12

11. a) With a neat sketch, derive the process of energy storage

in a flywheel.

b) The equation of the turning moment curve of a three

crank engine is ( 5000 + 1500 sin3θ ) N-m, where θ is

the crank angle in radians. The moment of inertia of the

flywheel is 1000 kg m2 and the mean speed is

300 r.p.m. Calculate the maximum fluctuation of the

speed of the flywheel in percentage when (i) the resisting

torque is constant, (ii) the resting torque is

( 5000 + 600 sinθ ) N-m. 5 + 10

12. a) Find the natural frequency of the vibratory system

shown in the figure below, considering the mass

of spring per unit lengths is 1m .


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b) A rotor has a mass of 12 kg and is mounted midway on

a 24 mm diameter horizontal shaft supported at the

ends by two bearings. The bearings are 1 m apart. The

shaft rotates at 2400 rpm. If the centre of the mass of

the rotor is 0·11 mm away from the geometric centre of

the rotor due of a certain manufacturing defect, find the

amplitude of the steady state vibration and the dynamic

force transmitted to the bearing. Modulus of elasticity 2GN/m200=E . 7 + 8

=============

5108 [ Turn over

Name : ……………………………………………………………

Roll No. : ……………………………………………..…………..

Invigilator's Signature : ………………………………………..

CS/B.TECH(ME/PE/PWE)/SEM-5/ME-502/2011-12

2011

HEAT TRANSFERTime Allotted : 3 Hours Full Marks : 70


Candidates are required to give their answers in their own words asfar as practicable.

GROUP – A

( Multiple Choice Type Questions )

1. Choose the correct alternatives for the following :

10 × 1 = 10

i) The temperature distribution at a certain instant

of time in a concrete slab during curing is given by

T = 3x 2 + 3x + 16, where x is in cm and T is in K. The

rate of change of temperature with time is given by

( assuming thermal diffusivity to be 5 × 10 – 4 cm 2 /s )

a) + 0·0009 k/s b) 0·0045 k/s

c) – 0·0030 k/s d) – 0·0018 k/s.

CS/B.TECH(ME/PE/PWE)/SEM-5/ME-502/2011-12

5108 2

ii) For more effective heat transfer, fins should be

a) thick and small in number

b) thin and large in number

c) medium size and small in number

d) none of these.

iii) For a current carrying wire of 20 mm diameter

exposed to air ( h = 25 W/m 2 K ), maximum heat

transfer occurs when the thickness of insulation

( K = 0·5 W/m K ) is

a) 20 mm b) 10 mm

c) 5 mm d) 0 mm.

iv) Fourier number is defined as

a) non-dimensional time

b) non-dimensional temperature

c) non-dimensional internal energy

d) non-dimensional heat flux.

v) For flow of a heat transfer oil ( Pr = 20 ) over a flat

plate, the thermal boundary layer thickness for laminar

forced convection is

a) thicker than the hydrodynamic boundary layer

b) equal to that of hydrodynamic boundary layer

c) thinner than the hydrodynamic boundary layer

d) constant along the plate.

WBUT Mechanical Engineering 5thSemester Previous Year Question Paper

Publisher : Faculty Notes Author : Panel Of Experts

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2012 - content.kopykitab.com · i) For an underdamped system, motion is a) exponentially decreasing b) oscillatory c) non-oscillatory d) aperiodic. ii) Damping ratio (ζ) is defined