Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem New 2142506 Fundamentals Of Machine Design Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (New) EXAMINATION ? WINTER 2019
Subject Code: 2142506 Date: 14/12/2019
Subject Name: Fundamentals of Machine Design
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.
Q.1 (a) Define Principle Stress, Shear Stress and Residual Stress. 03
(b) What is factor of safety? What are the factors to be considered while selecting
the same?
04
(c) Explain the General Procedure in machine design. 07
Q.2 (a) Explain the types of riveted joints. 03
(b) Explain the terminology used in riveted joints. 04
(c) Explain the failures of riveted joints. 07
OR
(c) A double riveted lap joint is made between 15 mm thick plates. The rivet
diameter and pitch are 25 mm and 75 mm respectively. If the ultimate stresses
are 400 MPa in tension, 320 MPa in shear and 640 MPa in crushing, find the
minimum force per pitch which will rupture the joint.
If the above joint is subjected to a load such that factor of safety is 4. Find out
the actual stresses developed in the plates and the rivets.
07
Q.3 (a) Describe the types of welded joints with neat sketch. 03
(b) Explain the advantages and disadvantages of welded joints over riveted joints. 04
(c) A 50 mm diameter solid shaft is welded to a flat plate as shown in Fig.
If the size of the weld is 15 mm, find the maximum normal and shear stress
in the weld.
07
OR
Q.3 (a) Explain the terminology used in screw threads. 03
(b) Explain Gib and cotter joint with neat sketch. 04
(c) Explain the Design procedure of Knuckle joint. 07
Q.4 (a) Explain various types of sunk keys. 03
(b) Discuss the design procedure of shafts on the basis of rigidity. 04
(c) Design a cast iron protective type flange coupling to transmit 15 kW at 900
r.p.m. from an electric motor to a compressor. The service factor may be
assumed as 1.35. The following permissible stresses may be used :
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (New) EXAMINATION ? WINTER 2019
Subject Code: 2142506 Date: 14/12/2019
Subject Name: Fundamentals of Machine Design
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.
Q.1 (a) Define Principle Stress, Shear Stress and Residual Stress. 03
(b) What is factor of safety? What are the factors to be considered while selecting
the same?
04
(c) Explain the General Procedure in machine design. 07
Q.2 (a) Explain the types of riveted joints. 03
(b) Explain the terminology used in riveted joints. 04
(c) Explain the failures of riveted joints. 07
OR
(c) A double riveted lap joint is made between 15 mm thick plates. The rivet
diameter and pitch are 25 mm and 75 mm respectively. If the ultimate stresses
are 400 MPa in tension, 320 MPa in shear and 640 MPa in crushing, find the
minimum force per pitch which will rupture the joint.
If the above joint is subjected to a load such that factor of safety is 4. Find out
the actual stresses developed in the plates and the rivets.
07
Q.3 (a) Describe the types of welded joints with neat sketch. 03
(b) Explain the advantages and disadvantages of welded joints over riveted joints. 04
(c) A 50 mm diameter solid shaft is welded to a flat plate as shown in Fig.
If the size of the weld is 15 mm, find the maximum normal and shear stress
in the weld.
07
OR
Q.3 (a) Explain the terminology used in screw threads. 03
(b) Explain Gib and cotter joint with neat sketch. 04
(c) Explain the Design procedure of Knuckle joint. 07
Q.4 (a) Explain various types of sunk keys. 03
(b) Discuss the design procedure of shafts on the basis of rigidity. 04
(c) Design a cast iron protective type flange coupling to transmit 15 kW at 900
r.p.m. from an electric motor to a compressor. The service factor may be
assumed as 1.35. The following permissible stresses may be used :
07
2
Shear stress for shaft, bolt and key material = 40 MPa
Crushing stress for bolt and key = 80 MPa
Shear stress for cast iron = 8 MPa
OR
Q.4 (a) Describes the types of levers with neat diagram. 03
(b) Discuss the design procedure of Lever. 04
(c) A handle for turning the spindle of a large valve as shown in Fig. The length
of the handle from the centre of the spindle is 450 mm. The handle is attached
to the spindle by means of a round tapered pin. If an effort of 400 N is applied
at the end of the handle.
Find: 1. Mean diameter of the tapered pin.
2. Diameter of handle.
The allowable stresses for the handle and pin are 100 MPa in tension and 55
MPa in shear.
07
Q.5 (a) Differentiate struts and columns 03
(b) Explain rankine?s formula for columns 04
(c) A T-section 150 mm ? 120 mm ? 20 mm is used as a strut of 4 m long hinged
at both ends. Calculate the crippling load, if Young?s modulus for the material
of the section is 200 kN/mm
2
.
07
OR
Q.5 (a) Explain machining symbols with all parameters. 03
(b) Describe Johnson?s Formulae for Columns. 04
(c) Calculate the diameter of a piston rod for a cylinder of 1.5 m diameter in which
the greatest difference of steam pressure on the two sides of the piston may be
assumed to be 0.2 N/mm
2
. The rod is made of mild steel and is secured to the
piston by a tapered rod and nut and to the crosshead by a cotter. Assume
modulus of elasticity as 200 kN/mm
2
and factor of safety as 8. The length of
rod may be assumed as 3 meters.
07
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This post was last modified on 20 February 2020