Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem New 2141907 Machine Design And Industrial Drafting Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (New) EXAMINATION ? WINTER 2019
Subject Code: 2141907 Date: 14/12/2019
Subject Name: Machine Design & Industrial Drafting
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.
MARKS
Q.1 (a) Explain Hole basis system and Shaft basis system. 03
(b) Explain selection and use of theories of failure. 04
(c) Explain types of fit with suitable examples. 07
Q.2 (a) Compare compressive stress and crushing stress. 03
(b) Describe factor of safety. 04
(c) Design a spigot and socket type cotter joint to connect
two similar rods subjected to 75 kN axial loads in both
the direction. For the rod as well as cotter material, shear
stress is equal to 80 % of tensile stress. Tensile stress and
crushing stress are 50 N/mm
2
and 100 N/mm
2
respectively. Determine (1) Diameter of rod (2)
Diameter of spigot (3) Diameter of socket sleeve.
07
OR
(c) 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 and long arm is 500 mm and 750 mm
respectively. Allowable shear stress and tensile stress for
lever and pin materials is 60 N/mm
2
and 80 N/mm
2
respectively. Allowable bearing pressure for pin
material is 8 N/mm
2
. For pin L/D=1.25. And for the
rectangular cross section of the lever, ratio of height to
width is 3. Determine: (1) dimension of the fulcrum pin
(2) Dimension of lever.
07
Q.3 (a) Explain different types of supports. 03
(b) Define: (1) Pitch (2) Lead (3) Nominal diameter (4) Core
diameter for Power screw.
04
(c) A 400 mm long alloy steel rod is used to support an axial
compressive load of 65 kN. One end of rod is fixed and
other end is free to support load. Assuming compressive
yield strength 550 N/mm2 and modulus of elasticity 210
GPa. Calculate diameter of rod by buckling
consideration. Use Rankin?s formula with Rankin?s
constant ? = 1 /7500 and factor of safety is 3.5.
07
OR
Q.3 (a) Explain different end condition of column. 03
(b) Define: (1) Pitch (2) Back Pitch (3) Diagonal Pitch (4)
Margin for Riveted joint.
04
(c) An I section 500 mm ? 250 mm ? 10 mm and 10 m 07
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (New) EXAMINATION ? WINTER 2019
Subject Code: 2141907 Date: 14/12/2019
Subject Name: Machine Design & Industrial Drafting
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.
MARKS
Q.1 (a) Explain Hole basis system and Shaft basis system. 03
(b) Explain selection and use of theories of failure. 04
(c) Explain types of fit with suitable examples. 07
Q.2 (a) Compare compressive stress and crushing stress. 03
(b) Describe factor of safety. 04
(c) Design a spigot and socket type cotter joint to connect
two similar rods subjected to 75 kN axial loads in both
the direction. For the rod as well as cotter material, shear
stress is equal to 80 % of tensile stress. Tensile stress and
crushing stress are 50 N/mm
2
and 100 N/mm
2
respectively. Determine (1) Diameter of rod (2)
Diameter of spigot (3) Diameter of socket sleeve.
07
OR
(c) 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 and long arm is 500 mm and 750 mm
respectively. Allowable shear stress and tensile stress for
lever and pin materials is 60 N/mm
2
and 80 N/mm
2
respectively. Allowable bearing pressure for pin
material is 8 N/mm
2
. For pin L/D=1.25. And for the
rectangular cross section of the lever, ratio of height to
width is 3. Determine: (1) dimension of the fulcrum pin
(2) Dimension of lever.
07
Q.3 (a) Explain different types of supports. 03
(b) Define: (1) Pitch (2) Lead (3) Nominal diameter (4) Core
diameter for Power screw.
04
(c) A 400 mm long alloy steel rod is used to support an axial
compressive load of 65 kN. One end of rod is fixed and
other end is free to support load. Assuming compressive
yield strength 550 N/mm2 and modulus of elasticity 210
GPa. Calculate diameter of rod by buckling
consideration. Use Rankin?s formula with Rankin?s
constant ? = 1 /7500 and factor of safety is 3.5.
07
OR
Q.3 (a) Explain different end condition of column. 03
(b) Define: (1) Pitch (2) Back Pitch (3) Diagonal Pitch (4)
Margin for Riveted joint.
04
(c) An I section 500 mm ? 250 mm ? 10 mm and 10 m 07
2
long is used as a column. Both the ends of column are
fixed. Take young?s modulus E= 200 GPa. Calculate
Euler?s critical load.
Q.4 (a) Compare between shaft, axle and spindle. 03
(b) List types of key with neat figure. 04
(c) A muff coupling is used to connect two shafts rotating
at 300 rpm and transmitting 55 hp. Calculate: (1) Shaft
diameter (2) Outside diameter of sleeve (3) Design of
key. Assume permissible shear stress for shaft and key
as 42 N/mm
2
and for cast iron sleeve as 15 N/mm
2
.
07
OR
Q.4 (a) Classify coupling. 03
(b) Define : (1) Shaft (2) Key (3) Coupling (4) Axle 04
(c) Calculate the power transmission capacity of a muff
coupling having shaft diameter of 80 mm, muff diameter
of 150 mm rotating at 150 rpm. Permissible shear stress
for shaft and muff are 50 N/mm
2
and 10 N/mm
2
respectively.
07
Q.5 (a) Illustrate surface roughness symbol and direction of lay
and their symbol.
03
(b) For single riveted lap joint, the plate thickness is 12 mm
and the pitch of the joint is 70 mm. Determine rivet
diameter, tearing, shearing, and crushing efficiencies of
the joint.
Take Shear stress=60 N/mm
2
, Crushing stress=100
N/mm
2
, Tensile stress=80 N/mm
2
.
04
(c) Analyze the force analysis for square threaded power
screw.
07
OR
Q.5 (a) Illustrate flatness, straightness and circularity with
symbol.
03
(b) A circular shaft, 80 mm in diameter is welded to support
by means of a circumferential fillet weld. It is subjected
to a torsion moment of 3000 N-m. Determine the size of
weld, if the maximum shear stress in the weld is not to
exceed 70 N/mm
2
.
04
(c) Analyze different stresses during design of screw and
nut.
07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020