Design of Machine Elements previous year question paper | 3351902 |

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

One of the simplest ways to prepare for the exams is to manage your study according to a well-defined time table and allot time to every subject. It is a good practice to compare the questions of the examiners because it will give a better idea about what the examiner is looking for in the exam.

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Most of the universities keep copies of the past exams in their libraries or they can also be accessed from the university websites available on the internet. A good practice is to take past five year papers and, instead of going through the past exam paper year by year, find questions about the same topic and prepare that topic really well. This technique can be very helpful for preparing the exam.

Advantages of Studying gtu previos Exam Papers

One of the most important part of exam preparation is going through past exams. It is important  to revise your entire syllabus quickly. They can provide you the general idea of the upcoming paper and you could easily guess the important topics of a particular subject. Past exam papers give you the idea of number of questions and the available choices. It is therefore necessary for students to give some time to go through the past paper while revising a subject.

Past exam papers are one of the most helpful tools available to prepare for both internal and external examinations as they provides students with practical insight into how the forthcoming exam paper is likely to look and the key themes or subject areas most likely to be covered. Before starting revision for a subject it is always worth taking time to seek out past papers.

Winter 2014 Design of Machine Elements Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
Diploma Engineering - SEMESTER–V • Examination – WINTER • 2014
Subject Code: 3351902  Date: 28-11-2014
Subject Name: Design of Machine Elements
Time: 10:30 am - 01:00 pm  Total Marks: 70

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

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Q.1    Answer any seven out of ten.  14

1.  Distinguish between Contact stress & Bearing Stress.

2.  List applications of Cotter Joint.

3.  Sketch Single Riveted Lap Joint.(Two Views)

4.  State at least four uses of Pressure Vessels.

5.  Give names of different types of Antifriction Bearings.

6.  Write the equation by which angle of twist for a shaft is calculated.

7.  Define Bearing Life.

8.  State the assumptions made in the design of thick cylinder.

9.  Name four possible cases in which bolts are carrying eccentric loading.

10.  State functions of Leaf Spring.

Q.2  (a)  Define (1) Plasticity (2) Toughness & (3) Hardenability  03

OR

(a)  Explain the following designation of  materials. (1) 40 C 8 (2) 49 Cr 1 Mo 28  (3) T 50   03

(b)  A  20  mm  side equilateral triangle hole is to be punched in  8  mm thick plate. Calculate the capacity of punch, if shear stress of plate is 100 N/mm2.    03

OR

(b)  An eye bolt has to lift  30 KN load. If permissible tensile stress is 60 N/mm2, find bolt size.   03

(c)  Standardize six speeds between 200 RPM and 1000 RPM.  04

OR

(c)  Write R10/3 series for numbers between 10 and 100.  04

(d)  Two rods are connected by a Knuckle Joint  to  sustain a maximum load of 50 KN.  Calculate  diameter  of  the  rod  and  knuckle  pin  diameter  using  following stresses. f t = 80 N/mm2and f s = 50 N/mm2.   04

OR

(d)  Write the area resisting for each failure with the help of sketch for Spigot End of Cotter Joint.   04

Q.3  (a)  A double riveted double cover Butt Joint is used to connect  two plates of 10 mm thick using 18  mm diameter rivets. If permissible stresses are 80 N/mm2in tension  for  plates,  65  N/mm2in  shear  and  130  N/mm2i n  crushing  for  rivets, find pitch. What is the efficiency of the joint?06

OR

(a)  The  compressive  load  on  the  nut  and  screw  clamp  is  70  KN.  Calculate  the diameter of the screw and height of nut. Neglect buckling. Assume single start square  threads  of  2  threads/cm.  Take  for  screw  fc  =  100 N/mm2and bearing pressure  f bearing = 20 N/mm2   06

(b)  Draw neat sketch of a Semi Elliptical Leaf Spring. Label its various parts.   03

OR

(b)  State the modulus of section with neat sketch for the following cross sections.
(a)  Hollow Rectangular Cross Section  (b)Elliptical Cross Section (c.)  Hollow Circular Cross Section    03

(c)  Design a fulcrum pin of a right angled bell crank lever to raise a vertical load  of6  KN at longer arm. The arm lengths are 600 mm & 200  mm. The stresses are f t  =  100  N/mm2,  f  bearing  =  15  N/mm2&  fs  =  50  N/mm2   Neglect  bending. (Assume l/d = 1.25)   05

OR

(c)  Determine bending stress induced in a semi elliptical leaf spring from following data.
(i) Central Load  = 10 KN
(ii)Effective span  = 1000 mm
(iii) Width of leaves  = 50 mm
(iv)  Thickness of leaves = 5 mm
(v) Total Numbers of leaves = 10 ( including 2 extra full length leaves)Also find deflection of spring if   E  = 2 X 105MPa   05

Q.4  (a)  Explain  with the help of neat sketch the difference between solid length & free length for a compression spring.   03

OR

(a)  State at least three requisites for a good coupling.  03

(b)  A hollow shaft 200 mm inside diameter and 300 mm outside diameter transmits 2500 KW at 200 RPM. Calculate the stress induced in shaft.   04

OR

(b)  For Closed coil helical spring, find spring wire diameter & no. of active turns of coil from following data.
(i)  Load Range = 2.25 KN to 2.75 KN
(ii)  Spring Deflection for above load range = 6 mm
(iii)  Spring Index  = 5
(iv)  Shear Stress for spring = 420 N/mm2
(v)  Modulus of Rigidity, G = 84 KN/mm2     04

(c)  A  simple flange coupling has to transmit 50 KW at 250 RPM. . Assume torque to  be  20  %  more  than  the  full  load.  Calculate  (a)  Shaft  diameter  (b)  Key Dimensions and (c) number & size of Bolts. The stresses are as under,For Shaft & Key fc = 100 N/mm2, f s = 50 N/mm2& f\t = 75 N/mm2For Bolt fs = 40 N/mm2     07

Q.5  (a)  The vertical load on a “C” clamp is 30 KN. The distance between load line and neutral axis is 200 mm. The frame is made up of Cast iron having rectangular cross  section. The height of cross section is twice the width.  For “C” clamp, the  maximum  safe  stress  is  100  N/mm2.  Find  the  dimensions  of  rectangular cross section.06

(b)   Calculate the thickness of cylinder from the following data using Lame’s theory.
(1)  Hoop stress = 80 N/mm2
(2) The Internal dia. Of cylinder = 250 mm
(3) The maximum pressure of the fluid inside the cylinder is 40 N/mm2    04

(c)  Differentiate between Journal Bearing and Antifriction Bearing  only for load, speed, noise & maintenance   04

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Summer 2015 Design of Machine Elements Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – • EXAMINATION – SUMMER-2015
Subject Code: 3351902  Date:04/05 /2015
Subject Name: DESIGN of MACHINE ELEMENTS
Time: 2:30 pm to 5:00 pm  Total Marks: 70

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

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Q.1   Answer any seven out of ten.  14

1.  State types of design and explain any one .

2.  What are the general considerations in machine design .

3.  Explain stress concentration.

4.  Factors affecting the value of factor of safety.

5.  State advantages of standardization.

6.  Determine 6 standard spindle speed of the machine having minimum and max. speed are 224 rpm & 710 rpm.

7.  State application of cotter joint.

8.  State types and application of leaf spring .

9.  Mention machine subjected to eccentric loading.

10.  Write assumptions made in the design of thin cylinder.

Q.2  (a)  Find rod diameter and spigot diameter for cotter joint ifaxial load is 75 KN. , [τ] = 4/5[6t] ,[6t] = 50 N/mm^2 and [6c] = 100 N/mm^2   03

OR

(a)  State & explain failures of Riveted joints.  03

(b)  Determine rivet diameter to join 12 mm thick m.s. plates bysingle riveted lap joint. The pitch is 70 mm. find shearing efficiency of joint if [τ] = 60 N/mm^2 ,[6t] = 80 N/mm^2    03

OR 

(b)  Find socket diameter & socket collar diameter for given data in example 2(a)    03

(c)  A knuckle joint to connect two m.s. rods of equal diameter having axial tensile load of 15 KN. [τ] = 60 N/mm^2 ,[6t] = 80 N/mm^2 and [6c] = 150 N/mm^2 find basic dimensionswithout considering bending.    04

OR 

(c)  State & explain standard elements & their location on a welding symbol.  04
(d)  Fulcrum pin of a bell crank lever is to be designed where 7000N. load acting on longer arm is to be lifted. The length of arms is 400 mm & 100 mm . [τ] = 50 N/mm^2 ,[6t] = 70 N/mm^2 &[Pb]= 15 N/mm^2. Find diameter and length of fulcrum pin .do not consider bending.    04

OR 

(d)  A semi elliptical spring with 900 mm span and 55 mm width of leaves is fixed in the centre using 50 mm wide bend. If thickness of eachleaf is 5 mm , find number of leaves to sustain 5500 N load in the centre. [6b]= 490 N/mm^2. Also find deflection of the spring . first 2 leaves arefull length .E=210 N/mm^2 04

Q.3  (a)  Find the diameter of the shaft to transmit 80 hp at 150 rpm. [τ] = 63 N/mm^2  03

OR 

(a)  A solid shaft is subjected to bending moment of 3.46 kN.m and torque of 11.5 kN.m . 6ut =690 Mpa. Ultimate τ = 516 Mpa. Find shaft diameterby equivalent torque if factor of safety is 6.   03

(b)  A pulley is fixed on a 100 mm diameter shaft with the help of 100 mm long key. the shaft transmit 6000 N.mtorque with this key. Find dimension of key if 6uc =500 N/mm^2 and Ultimate τ = 250 N/mm^2. Factor of safety is 5. 03

OR 

(b)  State the design step for muff coupling.  03

(c)  State fundamental equation of twisting moment.  04

OR 

(c)  A valve spring having inner diameter of a coil 40 mm , deflects for 40 mm at the maximum axial load of500 N. Find wire diameter and number of turns for the spring . [τ] = 300 N/mm^2 , spring index =6 and G = 0.82 x 10^5 N/mm^2 04

(d)  20  kN  vertical  loads  are  acting  at  the  end  of  the  “C”  clamp having  a rectangular  cross  section.  The  perpendicular  distance  between  the  load  axis and the neutral axis of the cross section is 150 mm. Find the dimensions of the  cross  section  of  the  clamp  for  the  permissible  stresses  of  100  N/mm^2 (h=2b)    04

OR 

(d)  Write applications, classification and main consideration for design of pressure vessels.   04

Q.4  (a)  A cylinder with 150 mm inside diameter and 15 mm plate thickness is subjected to internal pressure of 5 N/mm^2.find hoop stress ,longitudinal stress and max. shear stress in the cylinder.    03

OR 

(a)  A ram of a hydraulic cylinder having 200 mm internal diameter is subjected to oil pressure of 10 Mpa. If the permissible stress for the cylinder material is 28 Mpa. Find outside diameter of the cylinder. 03

(b)  Explain bearing characteristic number & bearing life.  04

OR 

(b)  Explain antifriction bearing with applications & advantages.  04

(c)  A protected type flange coupling has to transmit 40 KW. At 450 rpm . Shaft, key & bolts are made from steel . Considering effect of overload & key way effect .Find shaft diameter, hub diameter, bolt diameter. Assume [τ] = 45 N/mm^2 for shaft & bolt, [6t] = 10 N/mm^2 forhub.    07

Q.5  (a)  A circular steel pipe has outer diameter of 60 mm and thickness of 3 mm. If the ,[6t]pipe = 60 N/mm^2, Find the permissible axial load forthe pipe. Also find the diameter of solid round barof same material as pipe for the same load. 04

(b)  A deep groove ball bearing having SKF 6309 number is rotating at 1500 rpm. the bearing is subjected to radial load of 8500 N and thrust load of 5500 N. The inner race of the bearing rotate with shaft . find the rating life and average life of the bearing . the dynamic capacity of the bearing is 41500 N and the bearing is in continuous service .Take X= 0.56 & Y=1.3    04

(c)  State comparison between knuckle joint & cotter joint  03

(d)  State types of stresses on machine elements and explain briefly.  03

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Winter 2015 Design of Machine Elements Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – V-EXAMINATION – WINTER 2015
Subject Code: 3351902  Date: 10/12/2015
Subject Name: Design of Machine Elements
Time: 10:30 AM TO 1:00 PM  Total Marks: 70

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

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Q.1    Answer any seven out of ten.  14

1.  List types of stresses.

2.  Define F.O.S.

3.  List most materials used in manufacturing of machines.

4.  What is standardization ?

5.  List main factors influencing design of machine elements

6.  List types of loads.

7.  What is stress concentration ?

8.  What are preferred numbers ?

9.  List and shortly explain two main properties of  material which are useful in design.

10.  List types of  keys and their uses.

Q.2  (a)  List type of riveted joints. Discuss  (equations for)  strength and efficiency of riveted joint.    03

OR

(a)  Find force and consequently tensile stress induced in M24 size bolt due to initial tightening   03

(b)  List types of welded joints., with their symbols.  03

OR

(b)  List advantages and disadvantages of screwed joint.  03

(c)  A  double  riveted  lap  joint  is  made  between  15  mm  thick  plates.  Ihe  rivet diameter and pitch are 25 mm and 75 mm respectively. If ultimate stresses are 400 MPa in tension, 320 MPa in shear and 640 MPa in crushing, find minimum force which will rupture the joint.    04

OR

(c)  A plate 100 mm wide and 10 mm thick is to be welded to another plate by means of double parallel fillets. Plates are subjected to a static load of 80 kN. Find the length of weld if permissible shear stress in the weld does not exceed 55 MPa.   04

(d)  A cotter joint takes a pull of 30 kN. Find rod diameter 'd', spigot diameter 'd1' , and cotter thickness 't' of the joint if permissible stresses for the joint material (all parts are of same material) are 55 MPa, 100 Mpa and 40 MPa for tensile, crushing and shear respectively.    04

OR

(d)  A knuckle joint takes a pull of 70 kN. Find rod diameter 'd', knuckle pin diameter 'dp' , and eye end thickness 't' of  the joint if permissible stresses for the joint material (all parts are of same material) are 70 MPa, 110 Mpa and 66 MPa for tensile, crushing and shear respectively. Use empirical relation for dp, and t .  Check for induced shear stress in knuckle pin.    04

Q.3  (a)  List types of    levers. Draw neat sketches of three main c/s sections used as lever sections   03

OR

(a)  Why brass / bronze material is used in hole of lever at fulcrum pin ?   03

(b)  Write equations of modulus of section for  rectangular section and elliptical section   03

OR

(b)  Draw neat sketch of bell crank lever , label it's elements' name.  03

(c)  Draw neat sketch of semi-elliptical leaf spring and label it's parts. Explain it's construction( with material of it's parts) and working.   04

OR

(c)  A vertically downward load of W= 4.5 kN is acted on horizontal arm which is 500 mm long, of a bell crank lever. On short arm which is 150 mm long and perpendicular to horizontal arm has a effort 'p' acting at right angle to it's own axis. Find rectangular c/s of lever if width 'b' of section is 3 times the thickness 't' and allowable bending stress for forged lever material is not to exceed 75 MPa.   04

(d)  Draw  appropriate  neat  sketch  of  eccentric  loading  and  explain    eccentric loading  (with their equation)  of such m/c elements. List machine elements subjected to eccentric loading   04

OR

(d)  A  “  L”  bracket   carries  a   load  of  42  kN  with  rectangular   cross  section. Eccentricity of load with centre of bigger side of c/s section is  75  mm. Take safe tensile stress of 60 N/mm2. Find   c/s section of bracket if h= 2b for bracket section.   04

Q.4  (a)  List types of shafts. Normally which material is used as a shaft material ?  03

OR

(a)  Draw neat sketch of muff coupling and write empirical relational equations for it's design 03

(b)  A helical compression spring is to take load of 1000 N .The maximum compression on the spring is 80 mm. The spring index is 4.84.Take mod. of rigidity   G  =  85  kN/mm2.  Find  mean  diameter  'D',  wire  diameter  'd'.Approximate no. of turns 'n'= 30.     04

OR   

(b)  A solid shaft is transmitting 1 MW power at 240 R.P.M. Determine diameter of shaft if maximum torque   transmitted exceeds mean torque by 20%.  Assume maximum allowable shear stress as 60 MPa.   04

(c)  A C.I. flange coupling is required to transmit 15 kW at 900 R.P.M. Find shaft diameter  'd',   hub  diameter   'D',   no.  of   bolts   'n'  and  bolt  diameter  'db'. Permissible  stresses  -  shear  [τ]  for  shaft  and  bolt  material  =  40   Mpa  and crushing stress for bolt material = 80 Mpa and shear stress for C.I. flange material [τ] = 8 MPa.   07

Q.5  (a)  A thin cyl. pressure vessel of 500 mm internal diameter and 20 mm thickness is subjected to an internal pressure of 2 N/mm2. Find hoop stress, longitudinal stress and max. Shear stress.   04

(b)  Find  14  steps  of  various  speeds  (range)  between  25  R.P.M.  to  2000  R.P.M. using preferred numbers theory.   04

(c)  Broadly classify anti-friction bearing. Write their advantages and applications.   03

(d)  Define and classify pressure vessels. Write condition for thin and thick pressure vessel. Write name and equations for two types of stresses developed in thin cyl. shell subjected to internal pressure.03

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Summer 2016 Design of Machine Elements Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – V• EXAMINATION – SUMMER 2016
Subject Code: 3351902  Date:11/05/2016
Subject Name: Design of Machine Element
Time: 02:30 PM to 05:00 PM  Total Marks: 70

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

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

Q.1 Answer any seven out of ten.  14

1.  List out factor that effects selection of materials.

2.  Define 1) Ductility 2) Elasticity.

3.  Explain factor of safety and write it’s equation.

4.  Sketch double riveted butt joint.

5.  List application of knuckle joints.

6.  State type of stresses.

7.  State fundamental equation of pure bending with meaning of each terms.

8.  Define solid length and free length of tension spring.

9.  List advantages of antifriction bearing.

10.   List out machine elements subjected to eccentric loading.

Q.2  (a)  Explain factors effecting the value of F.O.S.  03

OR

(a)  Determine the force required to cut 60 mm diameter blank from 5 mm thick plate. Τu=350 n/mm^2.   03

(b)  Determine rivet diameter to join 12 mm thick plates by single riveted lap joint. The pitch of the joint 70 mm .Also determines tearing, shearing and crushing efficiency  of  joint.  Take [T]=60  N/mm^2,  [6c]= 100  N/mm^2  and  [6t]=  80 N/mm^2.   03

OR

(b)  Find knuckle rod diameter and pin diameter considering failure for joining to connect two m.s. rods of equal diameter subjected to axial tensile load of 15 kN. Take [T] =60 N/mm^2, [6c]= 150 N/mm^2 and [6t]= 80 N/mm^2.   03

(c)    Determine the standard sizes of 6 round bars having smallest diameter of 10mm and largest diameter of 32 mm .   04

OR

(c)  Enlist types of design and explain.   04

(d)  State application, advantages and limitations of power screw.  04

OR

(d)  A simple screw jack having square thread has 50 mm mean diameter and pitch of  12.4  mm.  If  the  coefficient  of  friction  between  screw  and  nut  is  0.13 .Determine the torque on the screw to lift the load of 25 kN. Find the efficiency of the screw assuming that the load rotates along with the screw.   04

Q.3  (a)  Explain types of levers based on number of fulcrums.   03

OR

(a)  State types and applications of leaf springs.   03

(b)  A bell crank lever is to be designed to lift the load of 10 kN. Acting at the end of short arm of the lever. The length of short arm is 500mm and long arm is 750 mm. allowable shear stress and tensile stress for lever and pin materials are 60 Mpa and 80 Mpa respectively. Allowable bearing pressure for pin is 8 Mpa. Determine pin dimension. For pin L/d=1.25   03

OR

(b)  Write design procedure of semi elliptical spring with main and graduated leaves.  03

(c)  A solid shaft is subjected to bending moment of 3.46 kN.m and torque of 11.5 kN.m. The shaft  material  has ultimate tensile stress 690 Mpa. and ultimate shear   stress  516  Mpa.  Determine  shaft  diameter   if  F.S.  =6(consider equivalent torque only)   04

OR

(c)  State the design steps of sleeve/Muff coupling.  04

(d)  Two 100 mm. diameter shafts are connected by flange coupling having 250 mm pitch circle diameter for the bolts .six bolts are used for coupling. for shaft and key [τ]=65 Mpa. for C.I. flange [τ]=7.5 Mpa and for bolts [τ]=30 Mpa. Determine, 1) power transmitted 2) diameter of bolt. Take speed 400 rpm and key way effect .(take key way effect factor 1.3)    04

OR

(d)  A valve spring having inner diameter of coil as 40 mm, deflects for 40 mm. at the maximum axial load of 500 N. Determine the wire diameter and number of turns . Allowable shear stress for spring is 300 Mpa. , spring index =6 and modulus of rigidity, G= 0.82x10^5 N/mm^2.   04

Q.4  (a)  Define eccentric loading & List the machine elements subjected to eccentric loading.   03

OR

(a)  State types of coupling and application of couplings.  03

(b)  20 kN load is acting at the end of the ‘C’ clamp having a rectangular cross section. The eccentric distance  is 150 mm.  in  horizontal direction. Find the dimensions of rect. Section  if permissible stress  is 100 N/mm^2  for clamp. Take h=2b  04

OR

(b)  A spindle of a drilling machine is subjected to a maximum load of 10 kN during operation. Determine the diameter of the solid cast iron column if the tensile stress is limited to 40 Mpa. Eccentric distance is 400mm.   04

(c)  Calculate spigot and socket dimensions (only diameter and do not consider bending) of a socket and spigot type cotter joint to connect two similar rod subjected to axial load of 75 kN. In both direction. The safe stresses are 50 Mpa in tension, 40 Mpa in shear and 100 Mpa in crushing.    07

Q.5  (a)  State application and classification of pressure vessels   04

(b)  A  cylinder  with  150  mm  inside  diameter  and  15  mm  plate  thickness  is subjected  to  internal  pressure  of  5  N/mm^2.  Determine  hoop  stress ,longitudinal stress and maximum shear stress in the cylinder 04

(c)  Write difference between antifriction and journal bearing.  03

(d)  The basic load rating for the selected bearing is 50 kN.  If the expected bearing life is 6000 Hrs. calculate the permissible equivalent load for the bearing at 500 rpm.(Take k=3)   03

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Winter 2016 Design of Machine Elements Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – V • EXAMINATION – WINTER- 2016
Subject Code:  3351902  Date: 21- 11- 2016
Subject Name: Design of Machine Elements
Time: 10:30 AM TO 01:00 PM  Total Marks: 70

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

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

Q.1 Answer any seven out of ten.   14

1.  List of factor affecting the value of Factor of Safety.

2.   State the advantages of standardization.

3.  Write the value of progression ratio for R5, R10, R20 and R40 series.

4.  What is stress concentration?

5.  Enlist the different types of Keys.

6.  State the assumptions made in the design of thin cylinder.

7.  Write the basic equation of bending theory, showing notations used.

8.  Define Machine design and list out different types of design.

9.  If  the  value  of  induced  hoop  stress  and  longitudinal  stress  on  thin cylindrical shell are 100 MPa and 50 MPa respectively then find value of maximum shear stress.

10.  If SKF  bearing No. 6006 is a deep groove ball  bearing then what  is size of bore?

Q.2  (a)    Differentiate between V-thread and square thread.  03

OR

(a)  State the application of power screw.  03

(b)  Compare cotter joint with knuckle joint in respect of (i) Use (ii) Type of loading and (iii) Construction.   03

OR

(b)  Draw the neat sketch of double cover, double riveted butt joint with zigzag pattern. (Two views).   03

(c)  In  a  double  riveted  butt  joint  with  two  equal  cover  strips,  having zigzag  arrangement  of  riveting  the  thickness  of  the  plate  9  mm. Consider  allowable  tensile  ,  crushing  and  shear  stress  are  100  MPa, 150  MPa  and  80  MPa  respectively.  Calculate  :-  i)  diameter  of  rivet and ii) pitch of rivet joint.   04

OR

(c)  Two mild steel bars are connected together with knuckle joint to resist axial  load  of  200KN.  Calculate  the  diameter  of  steel  bar  and  the diameter of knuckle pin if the safe  stresses for bar and pin are [σt] = 100 MPa and [τ] = 80 MPa.04

(d)  A cotter joint is used to connect two rods of equal diameter. The axial load to be resisted 100 KN. The working stress is 70  MPa  in tension, shear stress is 0.8[σt] and in  crushing it is 2[σt]. Find (i) diameter of   rod end and (ii) diameter of spigot end (iii) thickness of cotter.   04

OR

(d)  The  compressive  load  on  a  screw  jack  is  50  KN.  Safe  compressive stress in screw = 100  MPa, pitch of the single start square thread = 8 mm and allowable bearing pressure = 16  MPa. Find:-  (i) Size of the screw and (ii) height of nut.   04

Q.3  (a)  State the application of leaf spring and materials of leaf spring used for automobiles.   03

OR

(a)  Draw neat sketch of exhaust valve lever and label its parts.  03

(b)  What is eccentric loading? Give at least four names of machine elements subjected to eccentric loading.   03

OR

(b)  State importance of preloading.  03

(c) Write the equations bending stresses induces and deflection occurring in  the  leaf  spring  having  full  length  leaves  and  graduated  leaves,  in semi elliptical leaf spring.,   04

OR

(c)  Design  a  fulcrum  pin  of  a  bell  crank  lever  to  lift  a  load  of  2250  N acting at the end of 125 mm long arm. The effort is applied at the end    04 of 150 mm long arm. Allowable shear stress and bearing pressure for pin are 70 MPa and 10 MPa respectively. Take L/D = 1.25 for pin.

(d)  The spindle of a drilling machine is subjected to a maximum load of 10 KN during operation. The distance between the axis of the spindle and the axis of the column is 400 mm. Determine the maximum and minimum stress induced in the drilling column if the diameter of solid C.I column is 102 mm.   04

OR

(d)  Explain the design procedure of foundation bolts of pillar crane. 04

Q.4  (a)  Differentiate between shaft, axle and spindle.  03

OR

(a)  Explain the design procedure of key.  03

(b)  A closed coiled helical spring is to be designed for loads ranging from 2.5  KN to  3.0  KN. The axial compression of spring for load range is 10  mm,  mean  diameter  of  coil  is  36  mm  and  spring  index  is  6. Calculate : (i) diameter  of spring and (ii) No. Of active coils and (iii) spring stiffness. Take G= 0.8 x 105MPa.  04

OR

(b)  Determine  thickness  and  outer  diameter  of  hydraulic  cylinder  press whose internal  diameter is 300 mm. The maximum water pressure is 20  MPa  and  allowable  hoop  stress  for  C.I  cylinder  is  40  MPa.  Use lami’s equation.  04

(c)  A  C.I  flanged  coupling  is  transmitting  11  KW  at  500  RPM permissible shear stress for the shaft and bolt material is 60  MPa  and 40MPa  respectively,  permissible  crushing  stress  for  the  both  is  100 MPa  and permissible  shear stress  for  hub  material  is 6 MPa.  Design for  25  %  overload  capacity.  Determine  the  (i)  shaft  diameter ,  (ii) diameter  of  Hub,  (iii)  No.  Of  bolts,  and  (iv)  bolt  diameter.    Take necessary assumptions.   07

Q.5  (a)  Standardise six size of shaft diameter between 10 mm to 32 mm.   04

(b)  What  is  pressure  vessel?  List  the  materials  used  for  pressure  vessel and classify pressure vessel.   04

(c)  Sketch an antifriction bearing and lable its different elements.  03

(d)  Differentiate between journal bearing and anti-friction bearing.   03

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