ss.
USN
Fifth Semester B.E. Degree Examination, Dee:241-9/SAi1
20
Design of Machine Elements ? I
Max. Marks: 80
Note: 1. Answer FIVE full questions, choosing ONE full question from each module.
2. Use of design data handbook is permitted.
3. Missing data if any may be assumed.
= 1 a. What is mechanical engineering design? List the steps involved in design with a block
diagram.
(04 Marks)
b.
torsional moment of 100 N-in as shown in Fig. Q1 (b). Determine the maximum tensile and
the maximum shear stress. (08 Marks)
0.0
050.
0 71
-
P
0
tu
et)
'1.7.
O.) 6
4
?
0
?
c/)
0
?
c
?
c
9000N
Fig. Q1 (b)
c.
Explain the reasons for stress concentration in machine members and two methods adopted
OR
2 a. A machine element in the form of a Cantilever beam has a rectangular cross section of depth
200 mm. The beam is subjected to an axial tensile load of 60 KN and a transverse load of
50 KN acting downwards at the free end of the beam which has a span of 800 mm.
allowable tensile stress of 90 N/mm
2
. (90 MPa) (08 Marks)
b.
Fig. Q2 (b) limiting the maximum normal stress to 130 MPa taking stress concentration into
account. (08 Marks)
?14101.?
rove
Module-2
3 a. Derive an expression for impact stress in an axial bar of cross section 'A' and length '1' due
to an impact load 'W' falling from a height 'h' on the bar. (06 Marks)
b. A Cantilever beam of rectangular cross section has a span of 800 mm. The rectangular cross
transverse load that fluctuates between 8 KN down to 5 KN up. The material for the beam is
steel with an yield stress of 294 MPa, endurance strength of 275 MPa and factor of safety is
2.50. Determine the width of rectangular cross section taking surface finish factor as 0.95,
size factor on 0.90 and stress concentration factor as 1.65. (10 Marks)
ss.
USN
Fifth Semester B.E. Degree Examination, Dee:241-9/SAi1
20
Time: 3 hrs.
Max. Marks: 80
Note: 1. Answer FIVE full questions, choosing ONE full question from each module.
2. Use of design data handbook is permitted.
Module-1
= 1 a. What is mechanical engineering design? List the steps involved in design with a block
diagram.
(04 Marks)
A 50 mm diameter steel rod supports a load of 9 kN and in addition is subjected to a
torsional moment of 100 N-in as shown in Fig. Q1 (b). Determine the maximum tensile and
the maximum shear stress. (08 Marks)
0.0
00
0 71
-
1.5
0
tu
et)
0
O.) 6
4
C
0
?
c/)
c.)
?
c
?
tt,
9000N
Fig. Q1 (b)
c.
to reduce the same. (04 Marks)
OR
2 a. A machine element in the form of a Cantilever beam has a rectangular cross section of depth
200 mm. The beam is subjected to an axial tensile load of 60 KN and a transverse load of
Determine the width of rectangular cross section if the material of the beam is steel with an
allowable tensile stress of 90 N/mm
2
. (90 MPa) (08 Marks)
Determine the safe load that can be carried by a bar of rectangular cross section shown in
Fig. Q2 (b) limiting the maximum normal stress to 130 MPa taking stress concentration into
account. (08 Marks)
?14101.?
Fig. Q2 (b)
Module-2
3 a. Derive an expression for impact stress in an axial bar of cross section 'A' and length '1' due
to an impact load 'W' falling from a height 'h' on the bar. (06 Marks)
section of the beam has a depth of 200 mm. The free end of the beam is subjected to a
transverse load that fluctuates between 8 KN down to 5 KN up. The material for the beam is
steel with an yield stress of 294 MPa, endurance strength of 275 MPa and factor of safety is
2.50. Determine the width of rectangular cross section taking surface finish factor as 0.95,
15MEts
OR
4 a. Derive the Soderberg's equation for designing the members subjected to fatigue loading.
(06 Marks)
A simply supported beam of span 1000 mm is subjected to a central load of 20 KN that falls
from a height of 20 mm. The beam has a rectangular cross section of width 60 mm and
depth 200 mm. The material of the beam has a modulus of elasticity of 207 GPa. Determine
(i) Impact factor (ii) Instantaneous deflection (iii) Impact load. (10 Marks)
5 a. Design a socket and spigot type cotter joint to sustain an axial load of 100 KN. The material
selected for the joint has the following design stresses a, = 80 NiMM
2
, T = 60 Nimm
,
cr, =150 Nimm
2
. (08 Marks)
at 250 rpm and transmits a torque of 4300 N-m. The permissible shear stress for bolt
material is 50 MPa and permissible shear stress for flange is 8 MPa. Design bolts and the
coupling. (08 Marks)
OR
through a pulley 600 mm diameter located 400 mm from the left bearing from anothe
pulley directly below it. The power is delivered through a gear of 200 mm diameter located
?
counterclockwise when viewed through the left bearing. The belt has a ratio of tensions of
2.5 and the gear is of 20? pressure angle. Determine the shaft diameter assuming the shaft to
be made of steel with an yield shear stress of 180 MPa and factor of safety as 3. Take
Kb =
t
= 1.0 . (16 Marks)
Module-4
7 a. Design a double riveted butt joint with equal width cover plates to join two plates of
= 120MPa . (08 Marks)
b.
Determine the size of weld required for an eccentrically loaded weld as shown in
Fig. Q7 (b). The allowable stress in the weld is 75 MPa. (08 Marks)
,
, 1
25
"
OR
8 a. Two lengths of a flat tie bar of 18 mm thick are connected by a butt joint with equal cover
plates on either side. If a load of 400 KN is acting on the bar, design the joint such that the
section of the bar is not weakened by more than one rivet hole. The working stresses for the
160 MPa in crushing. (10 Marks)
b. A plate of 80 mm wide and 15 mm thick is to be joined with another plate by a single
transverse weld and a double parallel weld. Determine length of parallel weld if joint is
subjected to static loading. Take cy, = 90 MPa, T = 55 MPa an allowable stresses and stress
2 of 3 <://-
j-,
FirstRanker.com - FirstRanker's Choice
ss.
Fifth Semester B.E. Degree Examination, Dee:241-9/SAi1
20
Design of Machine Elements ? I
Time: 3 hrs.
Note: 1. Answer FIVE full questions, choosing ONE full question from each module.
2. Use of design data handbook is permitted.
3. Missing data if any may be assumed.
Module-1
diagram.
(04 Marks)
b.
A 50 mm diameter steel rod supports a load of 9 kN and in addition is subjected to a
the maximum shear stress. (08 Marks)
0.0
050.
00
-
P
1.5
tu
et)
'1.7.
0
4
?
C
?
c/)
0
c.)
c
?
c
tt,
Fig. Q1 (b)
c.
Explain the reasons for stress concentration in machine members and two methods adopted
to reduce the same. (04 Marks)
2 a. A machine element in the form of a Cantilever beam has a rectangular cross section of depth
200 mm. The beam is subjected to an axial tensile load of 60 KN and a transverse load of
50 KN acting downwards at the free end of the beam which has a span of 800 mm.
Determine the width of rectangular cross section if the material of the beam is steel with an
2
. (90 MPa) (08 Marks)
b.
Determine the safe load that can be carried by a bar of rectangular cross section shown in
account. (08 Marks)
?14101.?
rove
Fig. Q2 (b)
3 a. Derive an expression for impact stress in an axial bar of cross section 'A' and length '1' due
to an impact load 'W' falling from a height 'h' on the bar. (06 Marks)
b. A Cantilever beam of rectangular cross section has a span of 800 mm. The rectangular cross
section of the beam has a depth of 200 mm. The free end of the beam is subjected to a
steel with an yield stress of 294 MPa, endurance strength of 275 MPa and factor of safety is
2.50. Determine the width of rectangular cross section taking surface finish factor as 0.95,
size factor on 0.90 and stress concentration factor as 1.65. (10 Marks)
15MEts
4 a. Derive the Soderberg's equation for designing the members subjected to fatigue loading.
(06 Marks)
b.
A simply supported beam of span 1000 mm is subjected to a central load of 20 KN that falls
depth 200 mm. The material of the beam has a modulus of elasticity of 207 GPa. Determine
(i) Impact factor (ii) Instantaneous deflection (iii) Impact load. (10 Marks)
Module-3
5 a. Design a socket and spigot type cotter joint to sustain an axial load of 100 KN. The material
2
, T = 60 Nimm
2
,
2
. (08 Marks)
b. A cast iron flange coupling is used to connect two shafts of 80 mm diameter. The shaft runs
at 250 rpm and transmits a torque of 4300 N-m. The permissible shear stress for bolt
coupling. (08 Marks)
OR
6 A shaft mounted between bearings 1.2 m apart receives a power of 20 kW at 1000 rpm
through a pulley 600 mm diameter located 400 mm from the left bearing from anothe
?
700 mm from the left bearing to another gear in front of it. The shaft rotates
counterclockwise when viewed through the left bearing. The belt has a ratio of tensions of
be made of steel with an yield shear stress of 180 MPa and factor of safety as 3. Take
Kb =
1.5, K
t
Module-4
7 a. Design a double riveted butt joint with equal width cover plates to join two plates of
thickness 10 mm. The allowable stress for plate and rivets are a, = 80 MPa, T = 60 MPa and
= 120MPa . (08 Marks)
Determine the size of weld required for an eccentrically loaded weld as shown in
Fig. Q7 (b). The allowable stress in the weld is 75 MPa. (08 Marks)
tO0n7n
,
25
"
Fig. Q7 (b)
OR
plates on either side. If a load of 400 KN is acting on the bar, design the joint such that the
section of the bar is not weakened by more than one rivet hole. The working stresses for the
material of the bar is 100 MPa in tension, for the material of the rivet 70 MPa in shear and
160 MPa in crushing. (10 Marks)
transverse weld and a double parallel weld. Determine length of parallel weld if joint is
subjected to static loading. Take cy, = 90 MPa, T = 55 MPa an allowable stresses and stress
concentration factor as 1.5 for transverse weld and 2.7 for parallel weld.. Marks)
2 of 3 <://-
15ME54
Module-5
9 a. A cylinder head of a steam engine is subjected to a steam pressure of 0.8 MPa. It is held in
position by means of 12 bolts. A soft copper gasket is used to make the joint leak proof. The
not to exceed 110 MPa. (08 Marks)
b.
The lead screw of a lathe has single start ISO trapezoidal threads of 30 mm outside diameter
and 6 mm pitch. It drives a tool carriage and exerts an axial load of 1.5 KN on a thrust
rpm, find the power required to drive the screw. Take coefficient of friction for power screw
as 0.14 and for collar as 0.09. (08 Marks)
OR
10 a. Explain the stresses induced in a screw fastening subjected to static and impact loading.
b.
A power screw for a Jack has square threads of proportion 50 x 42 x8 . The coefficient of
friction at the threads is 0.1 and at the collar is 0.12. Determine the weight that can be lifted
by this jack through a human effort of 400 N, through a hand lever of span 400 mm.
3 of 3
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USN
Fifth Semester B.E. Degree Examination, Dee:241-9/SAi1
20
Design of Machine Elements ? I
--- Content provided by FirstRanker.com ---
Time: 3 hrs.Max. Marks: 80
Note: 1. Answer FIVE full questions, choosing ONE full question from each module.
2. Use of design data handbook is permitted.
3. Missing data if any may be assumed.
--- Content provided by FirstRanker.com ---
Module-1= 1 a. What is mechanical engineering design? List the steps involved in design with a block
diagram.
(04 Marks)
b.
--- Content provided by FirstRanker.com ---
A 50 mm diameter steel rod supports a load of 9 kN and in addition is subjected to atorsional moment of 100 N-in as shown in Fig. Q1 (b). Determine the maximum tensile and
the maximum shear stress. (08 Marks)
0.0
050.
--- Content provided by FirstRanker.com ---
000 71
-
P
--- Content provided by FirstRanker.com ---
1.50
tu
et)
'1.7.
--- Content provided by FirstRanker.com ---
0O.) 6
4
?
--- Content provided by FirstRanker.com ---
C0
?
c/)
0
--- Content provided by FirstRanker.com ---
c.)?
c
?
c
--- Content provided by FirstRanker.com ---
tt,9000N
Fig. Q1 (b)
c.
Explain the reasons for stress concentration in machine members and two methods adopted
--- Content provided by FirstRanker.com ---
to reduce the same. (04 Marks)OR
2 a. A machine element in the form of a Cantilever beam has a rectangular cross section of depth
200 mm. The beam is subjected to an axial tensile load of 60 KN and a transverse load of
50 KN acting downwards at the free end of the beam which has a span of 800 mm.
--- Content provided by FirstRanker.com ---
Determine the width of rectangular cross section if the material of the beam is steel with anallowable tensile stress of 90 N/mm
2
. (90 MPa) (08 Marks)
b.
--- Content provided by FirstRanker.com ---
Determine the safe load that can be carried by a bar of rectangular cross section shown inFig. Q2 (b) limiting the maximum normal stress to 130 MPa taking stress concentration into
account. (08 Marks)
?14101.?
rove
--- Content provided by FirstRanker.com ---
Fig. Q2 (b)Module-2
3 a. Derive an expression for impact stress in an axial bar of cross section 'A' and length '1' due
to an impact load 'W' falling from a height 'h' on the bar. (06 Marks)
b. A Cantilever beam of rectangular cross section has a span of 800 mm. The rectangular cross
--- Content provided by FirstRanker.com ---
section of the beam has a depth of 200 mm. The free end of the beam is subjected to atransverse load that fluctuates between 8 KN down to 5 KN up. The material for the beam is
steel with an yield stress of 294 MPa, endurance strength of 275 MPa and factor of safety is
2.50. Determine the width of rectangular cross section taking surface finish factor as 0.95,
size factor on 0.90 and stress concentration factor as 1.65. (10 Marks)
--- Content provided by FirstRanker.com ---
FirstRanker.com - FirstRanker's Choicess.
USN
Fifth Semester B.E. Degree Examination, Dee:241-9/SAi1
20
--- Content provided by FirstRanker.com ---
Design of Machine Elements ? ITime: 3 hrs.
Max. Marks: 80
Note: 1. Answer FIVE full questions, choosing ONE full question from each module.
2. Use of design data handbook is permitted.
--- Content provided by FirstRanker.com ---
3. Missing data if any may be assumed.Module-1
= 1 a. What is mechanical engineering design? List the steps involved in design with a block
diagram.
(04 Marks)
--- Content provided by FirstRanker.com ---
b.A 50 mm diameter steel rod supports a load of 9 kN and in addition is subjected to a
torsional moment of 100 N-in as shown in Fig. Q1 (b). Determine the maximum tensile and
the maximum shear stress. (08 Marks)
0.0
--- Content provided by FirstRanker.com ---
050.00
0 71
-
--- Content provided by FirstRanker.com ---
P1.5
0
tu
et)
--- Content provided by FirstRanker.com ---
'1.7.0
O.) 6
4
--- Content provided by FirstRanker.com ---
?C
0
?
c/)
--- Content provided by FirstRanker.com ---
0c.)
?
c
?
--- Content provided by FirstRanker.com ---
ctt,
9000N
Fig. Q1 (b)
c.
--- Content provided by FirstRanker.com ---
Explain the reasons for stress concentration in machine members and two methods adoptedto reduce the same. (04 Marks)
OR
2 a. A machine element in the form of a Cantilever beam has a rectangular cross section of depth
200 mm. The beam is subjected to an axial tensile load of 60 KN and a transverse load of
--- Content provided by FirstRanker.com ---
50 KN acting downwards at the free end of the beam which has a span of 800 mm.Determine the width of rectangular cross section if the material of the beam is steel with an
allowable tensile stress of 90 N/mm
2
. (90 MPa) (08 Marks)
--- Content provided by FirstRanker.com ---
b.Determine the safe load that can be carried by a bar of rectangular cross section shown in
Fig. Q2 (b) limiting the maximum normal stress to 130 MPa taking stress concentration into
account. (08 Marks)
?14101.?
--- Content provided by FirstRanker.com ---
roveFig. Q2 (b)
Module-2
3 a. Derive an expression for impact stress in an axial bar of cross section 'A' and length '1' due
to an impact load 'W' falling from a height 'h' on the bar. (06 Marks)
--- Content provided by FirstRanker.com ---
b. A Cantilever beam of rectangular cross section has a span of 800 mm. The rectangular crosssection of the beam has a depth of 200 mm. The free end of the beam is subjected to a
transverse load that fluctuates between 8 KN down to 5 KN up. The material for the beam is
steel with an yield stress of 294 MPa, endurance strength of 275 MPa and factor of safety is
2.50. Determine the width of rectangular cross section taking surface finish factor as 0.95,
--- Content provided by FirstRanker.com ---
size factor on 0.90 and stress concentration factor as 1.65. (10 Marks)15MEts
OR
4 a. Derive the Soderberg's equation for designing the members subjected to fatigue loading.
(06 Marks)
--- Content provided by FirstRanker.com ---
b.A simply supported beam of span 1000 mm is subjected to a central load of 20 KN that falls
from a height of 20 mm. The beam has a rectangular cross section of width 60 mm and
depth 200 mm. The material of the beam has a modulus of elasticity of 207 GPa. Determine
(i) Impact factor (ii) Instantaneous deflection (iii) Impact load. (10 Marks)
--- Content provided by FirstRanker.com ---
Module-35 a. Design a socket and spigot type cotter joint to sustain an axial load of 100 KN. The material
selected for the joint has the following design stresses a, = 80 NiMM
2
, T = 60 Nimm
--- Content provided by FirstRanker.com ---
2,
cr, =150 Nimm
2
. (08 Marks)
--- Content provided by FirstRanker.com ---
b. A cast iron flange coupling is used to connect two shafts of 80 mm diameter. The shaft runsat 250 rpm and transmits a torque of 4300 N-m. The permissible shear stress for bolt
material is 50 MPa and permissible shear stress for flange is 8 MPa. Design bolts and the
coupling. (08 Marks)
OR
--- Content provided by FirstRanker.com ---
6 A shaft mounted between bearings 1.2 m apart receives a power of 20 kW at 1000 rpmthrough a pulley 600 mm diameter located 400 mm from the left bearing from anothe
pulley directly below it. The power is delivered through a gear of 200 mm diameter located
?
--- Content provided by FirstRanker.com ---
700 mm from the left bearing to another gear in front of it. The shaft rotatescounterclockwise when viewed through the left bearing. The belt has a ratio of tensions of
2.5 and the gear is of 20? pressure angle. Determine the shaft diameter assuming the shaft to
be made of steel with an yield shear stress of 180 MPa and factor of safety as 3. Take
Kb =
--- Content provided by FirstRanker.com ---
1.5, Kt
= 1.0 . (16 Marks)
Module-4
7 a. Design a double riveted butt joint with equal width cover plates to join two plates of
--- Content provided by FirstRanker.com ---
thickness 10 mm. The allowable stress for plate and rivets are a, = 80 MPa, T = 60 MPa and= 120MPa . (08 Marks)
b.
Determine the size of weld required for an eccentrically loaded weld as shown in
Fig. Q7 (b). The allowable stress in the weld is 75 MPa. (08 Marks)
--- Content provided by FirstRanker.com ---
tO0n7n,
, 1
25
"
--- Content provided by FirstRanker.com ---
Fig. Q7 (b)OR
8 a. Two lengths of a flat tie bar of 18 mm thick are connected by a butt joint with equal cover
plates on either side. If a load of 400 KN is acting on the bar, design the joint such that the
section of the bar is not weakened by more than one rivet hole. The working stresses for the
--- Content provided by FirstRanker.com ---
material of the bar is 100 MPa in tension, for the material of the rivet 70 MPa in shear and160 MPa in crushing. (10 Marks)
b. A plate of 80 mm wide and 15 mm thick is to be joined with another plate by a single
transverse weld and a double parallel weld. Determine length of parallel weld if joint is
subjected to static loading. Take cy, = 90 MPa, T = 55 MPa an allowable stresses and stress
--- Content provided by FirstRanker.com ---
concentration factor as 1.5 for transverse weld and 2.7 for parallel weld.. Marks)2 of 3 <://-
j-,
FirstRanker.com - FirstRanker's Choice
ss.
--- Content provided by FirstRanker.com ---
USNFifth Semester B.E. Degree Examination, Dee:241-9/SAi1
20
Design of Machine Elements ? I
Time: 3 hrs.
--- Content provided by FirstRanker.com ---
Max. Marks: 80Note: 1. Answer FIVE full questions, choosing ONE full question from each module.
2. Use of design data handbook is permitted.
3. Missing data if any may be assumed.
Module-1
--- Content provided by FirstRanker.com ---
= 1 a. What is mechanical engineering design? List the steps involved in design with a blockdiagram.
(04 Marks)
b.
A 50 mm diameter steel rod supports a load of 9 kN and in addition is subjected to a
--- Content provided by FirstRanker.com ---
torsional moment of 100 N-in as shown in Fig. Q1 (b). Determine the maximum tensile andthe maximum shear stress. (08 Marks)
0.0
050.
00
--- Content provided by FirstRanker.com ---
0 71-
P
1.5
--- Content provided by FirstRanker.com ---
0tu
et)
'1.7.
0
--- Content provided by FirstRanker.com ---
O.) 64
?
C
--- Content provided by FirstRanker.com ---
0?
c/)
0
c.)
--- Content provided by FirstRanker.com ---
?c
?
c
tt,
--- Content provided by FirstRanker.com ---
9000NFig. Q1 (b)
c.
Explain the reasons for stress concentration in machine members and two methods adopted
to reduce the same. (04 Marks)
--- Content provided by FirstRanker.com ---
OR2 a. A machine element in the form of a Cantilever beam has a rectangular cross section of depth
200 mm. The beam is subjected to an axial tensile load of 60 KN and a transverse load of
50 KN acting downwards at the free end of the beam which has a span of 800 mm.
Determine the width of rectangular cross section if the material of the beam is steel with an
--- Content provided by FirstRanker.com ---
allowable tensile stress of 90 N/mm2
. (90 MPa) (08 Marks)
b.
Determine the safe load that can be carried by a bar of rectangular cross section shown in
--- Content provided by FirstRanker.com ---
Fig. Q2 (b) limiting the maximum normal stress to 130 MPa taking stress concentration intoaccount. (08 Marks)
?14101.?
rove
Fig. Q2 (b)
--- Content provided by FirstRanker.com ---
Module-23 a. Derive an expression for impact stress in an axial bar of cross section 'A' and length '1' due
to an impact load 'W' falling from a height 'h' on the bar. (06 Marks)
b. A Cantilever beam of rectangular cross section has a span of 800 mm. The rectangular cross
section of the beam has a depth of 200 mm. The free end of the beam is subjected to a
--- Content provided by FirstRanker.com ---
transverse load that fluctuates between 8 KN down to 5 KN up. The material for the beam issteel with an yield stress of 294 MPa, endurance strength of 275 MPa and factor of safety is
2.50. Determine the width of rectangular cross section taking surface finish factor as 0.95,
size factor on 0.90 and stress concentration factor as 1.65. (10 Marks)
15MEts
--- Content provided by FirstRanker.com ---
OR4 a. Derive the Soderberg's equation for designing the members subjected to fatigue loading.
(06 Marks)
b.
A simply supported beam of span 1000 mm is subjected to a central load of 20 KN that falls
--- Content provided by FirstRanker.com ---
from a height of 20 mm. The beam has a rectangular cross section of width 60 mm anddepth 200 mm. The material of the beam has a modulus of elasticity of 207 GPa. Determine
(i) Impact factor (ii) Instantaneous deflection (iii) Impact load. (10 Marks)
Module-3
5 a. Design a socket and spigot type cotter joint to sustain an axial load of 100 KN. The material
--- Content provided by FirstRanker.com ---
selected for the joint has the following design stresses a, = 80 NiMM2
, T = 60 Nimm
2
,
--- Content provided by FirstRanker.com ---
cr, =150 Nimm2
. (08 Marks)
b. A cast iron flange coupling is used to connect two shafts of 80 mm diameter. The shaft runs
at 250 rpm and transmits a torque of 4300 N-m. The permissible shear stress for bolt
--- Content provided by FirstRanker.com ---
material is 50 MPa and permissible shear stress for flange is 8 MPa. Design bolts and thecoupling. (08 Marks)
OR
6 A shaft mounted between bearings 1.2 m apart receives a power of 20 kW at 1000 rpm
through a pulley 600 mm diameter located 400 mm from the left bearing from anothe
--- Content provided by FirstRanker.com ---
pulley directly below it. The power is delivered through a gear of 200 mm diameter located?
700 mm from the left bearing to another gear in front of it. The shaft rotates
counterclockwise when viewed through the left bearing. The belt has a ratio of tensions of
--- Content provided by FirstRanker.com ---
2.5 and the gear is of 20? pressure angle. Determine the shaft diameter assuming the shaft tobe made of steel with an yield shear stress of 180 MPa and factor of safety as 3. Take
Kb =
1.5, K
t
--- Content provided by FirstRanker.com ---
= 1.0 . (16 Marks)Module-4
7 a. Design a double riveted butt joint with equal width cover plates to join two plates of
thickness 10 mm. The allowable stress for plate and rivets are a, = 80 MPa, T = 60 MPa and
= 120MPa . (08 Marks)
--- Content provided by FirstRanker.com ---
b.Determine the size of weld required for an eccentrically loaded weld as shown in
Fig. Q7 (b). The allowable stress in the weld is 75 MPa. (08 Marks)
tO0n7n
,
--- Content provided by FirstRanker.com ---
, 125
"
Fig. Q7 (b)
OR
--- Content provided by FirstRanker.com ---
8 a. Two lengths of a flat tie bar of 18 mm thick are connected by a butt joint with equal coverplates on either side. If a load of 400 KN is acting on the bar, design the joint such that the
section of the bar is not weakened by more than one rivet hole. The working stresses for the
material of the bar is 100 MPa in tension, for the material of the rivet 70 MPa in shear and
160 MPa in crushing. (10 Marks)
--- Content provided by FirstRanker.com ---
b. A plate of 80 mm wide and 15 mm thick is to be joined with another plate by a singletransverse weld and a double parallel weld. Determine length of parallel weld if joint is
subjected to static loading. Take cy, = 90 MPa, T = 55 MPa an allowable stresses and stress
concentration factor as 1.5 for transverse weld and 2.7 for parallel weld.. Marks)
2 of 3 <://-
--- Content provided by FirstRanker.com ---
j-,15ME54
Module-5
9 a. A cylinder head of a steam engine is subjected to a steam pressure of 0.8 MPa. It is held in
position by means of 12 bolts. A soft copper gasket is used to make the joint leak proof. The
--- Content provided by FirstRanker.com ---
bore diameter of the cylinder is 250 mm. Find the size of bolts so that the stress in bolts isnot to exceed 110 MPa. (08 Marks)
b.
The lead screw of a lathe has single start ISO trapezoidal threads of 30 mm outside diameter
and 6 mm pitch. It drives a tool carriage and exerts an axial load of 1.5 KN on a thrust
--- Content provided by FirstRanker.com ---
collar of 30 mm inside diameter and 50 mm outside diameter. If the lead screw rotates at 40rpm, find the power required to drive the screw. Take coefficient of friction for power screw
as 0.14 and for collar as 0.09. (08 Marks)
OR
10 a. Explain the stresses induced in a screw fastening subjected to static and impact loading.
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(06 Marks)b.
A power screw for a Jack has square threads of proportion 50 x 42 x8 . The coefficient of
friction at the threads is 0.1 and at the collar is 0.12. Determine the weight that can be lifted
by this jack through a human effort of 400 N, through a hand lever of span 400 mm.
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(10 Marks)3 of 3
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