1. A reciprocating steam engine connecting rod is subjected to a maximum load of 65 kN. Find the diameter of the connecting rod at its thinnest part, if the permissible tensile stress is 35 Nmm. JAns. 50 mm
1. A reciprocating steam engine connecting rod is subjected to a maximum load of 65 kN. Find the diameter of the connecting rod at its thinnest part, if the permissible tensile stress is 35 Nmm. JAns. 50 mm
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
![A double-decker train.
EXERCISES
1. A reciprocating steam engine connecting rod is subjected to a maximum load of 65 kN. Find the
diameter of the connecting rod at its thinnest part, if the permissible tensile stress is 35 N/mm.
[Ans. 50 mm)
2. The maximum tension in the lower link of a Porter governor is 580 N and the maximum stress in the
link is 30 Nimm. If the link is of circular cross-section, determine its diameter.
(Ans. 5 mm)
Тор
Contents
Simple Stresses in Machine Parts 117
3. A wrought iron rod is under a compressive load of 350 KN. If the permissible stress for the material is
52.5 Nimm, cakculate the diameter of the rod.
JAns. 95 mm)
4. A load of 5 kN is to be raised by means of a steel wire. Find the minimum diameter required, if the
stress in the wire is not to exceed 100 N/mm.
(Ans. 8 mm)
5. A square tie bar 20 mm x 20 mm in section carries a load. It is attached to a bracket by means
of 6 bolts. Calculate the diameter of the bolt if the maximum stress in the tie bar is 150 N/mm and in
the bolts is 75 N/mm
JAns. 13 mm)
6. The diameter of a piston of the steam engine is 300 mm and the maximum steam pressure
is 0.7 N/mm. If the maximum permissible compressive stress for the piston rod material is
40 N/mm, find the size of the piston rod.
LAns. 40 mm)
7. Two circular rods of 50 mm diameter are connected by a knuckle joint, as shown in Fig. 4.21, by a pin
of 40 mm in diameter. If a pull of 120 kN acts at each end, find the tensile stress in the rod and shear
JAns. 61 N/mm: 48 N/mm
stress in the pin.
Rod (1)
Rod (2)
Pin
Fig. 4.21
S. Find the minimum size of a hole that can be punched in a 20 mm thick mild steel plate having an
ultimate shear strength of 300 Nimm. The maximum permissible compressive stress in the punch
material is 1200 N/mm.
(Ans. 20 mm]
9. The crankpin of an engine sustains a maximum load of 35 kN due to steam pressure. If the allowable
bearing pressure is 7 Nimm?, find the dimensions of the pin. Assume the length of the pin equal to 1.2
times the diameter of the pin.
(Ans. 64.5 mm; 80 mm)
10. The following results were obtained in a tensile test on a mild steel specimen of original diameter
20 mm and gauge length 40 mm.
Load at limit of proportionality
=80 kN
Extension at 80 kN load
= 0.048 mm
= 85 kN
= 150 kN
When the two parts were fitted together after being broken, the length between gauge length was
Load at yield point
Maximum load
found to be 55.6 mm and the diameter at the neck was 15.8 mm.
Caculate Young's modulus, yield stress, ultimate tensile stress, percentage elongation and percentage
reduction in area.
(Ans. 213 KN/mm: 270 N/mm; 478 N/mm; 39%; 38%
I1. A steel rod of 25 mm diameter is fitted inside a brass tube of 25 mm internal dianmeter and 375 mm
external diameter. The projecting ends of the steel rod are provided with nuts and washers. The nuts
are tightened up so as to produce a pull of 5 kN in the rod. The compound is then placed in a lathe and
the brass is turmed down to 4 mm thickness. Calculate the stresses in the two materials.
(Ans. 7 Nimm, 7.8 N/mm)
Тор](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6d7f1800-34db-427c-862d-33a352a2689a%2F66060c98-6841-4cf6-8b92-81297da99759%2Fpp261us_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A double-decker train.
EXERCISES
1. A reciprocating steam engine connecting rod is subjected to a maximum load of 65 kN. Find the
diameter of the connecting rod at its thinnest part, if the permissible tensile stress is 35 N/mm.
[Ans. 50 mm)
2. The maximum tension in the lower link of a Porter governor is 580 N and the maximum stress in the
link is 30 Nimm. If the link is of circular cross-section, determine its diameter.
(Ans. 5 mm)
Тор
Contents
Simple Stresses in Machine Parts 117
3. A wrought iron rod is under a compressive load of 350 KN. If the permissible stress for the material is
52.5 Nimm, cakculate the diameter of the rod.
JAns. 95 mm)
4. A load of 5 kN is to be raised by means of a steel wire. Find the minimum diameter required, if the
stress in the wire is not to exceed 100 N/mm.
(Ans. 8 mm)
5. A square tie bar 20 mm x 20 mm in section carries a load. It is attached to a bracket by means
of 6 bolts. Calculate the diameter of the bolt if the maximum stress in the tie bar is 150 N/mm and in
the bolts is 75 N/mm
JAns. 13 mm)
6. The diameter of a piston of the steam engine is 300 mm and the maximum steam pressure
is 0.7 N/mm. If the maximum permissible compressive stress for the piston rod material is
40 N/mm, find the size of the piston rod.
LAns. 40 mm)
7. Two circular rods of 50 mm diameter are connected by a knuckle joint, as shown in Fig. 4.21, by a pin
of 40 mm in diameter. If a pull of 120 kN acts at each end, find the tensile stress in the rod and shear
JAns. 61 N/mm: 48 N/mm
stress in the pin.
Rod (1)
Rod (2)
Pin
Fig. 4.21
S. Find the minimum size of a hole that can be punched in a 20 mm thick mild steel plate having an
ultimate shear strength of 300 Nimm. The maximum permissible compressive stress in the punch
material is 1200 N/mm.
(Ans. 20 mm]
9. The crankpin of an engine sustains a maximum load of 35 kN due to steam pressure. If the allowable
bearing pressure is 7 Nimm?, find the dimensions of the pin. Assume the length of the pin equal to 1.2
times the diameter of the pin.
(Ans. 64.5 mm; 80 mm)
10. The following results were obtained in a tensile test on a mild steel specimen of original diameter
20 mm and gauge length 40 mm.
Load at limit of proportionality
=80 kN
Extension at 80 kN load
= 0.048 mm
= 85 kN
= 150 kN
When the two parts were fitted together after being broken, the length between gauge length was
Load at yield point
Maximum load
found to be 55.6 mm and the diameter at the neck was 15.8 mm.
Caculate Young's modulus, yield stress, ultimate tensile stress, percentage elongation and percentage
reduction in area.
(Ans. 213 KN/mm: 270 N/mm; 478 N/mm; 39%; 38%
I1. A steel rod of 25 mm diameter is fitted inside a brass tube of 25 mm internal dianmeter and 375 mm
external diameter. The projecting ends of the steel rod are provided with nuts and washers. The nuts
are tightened up so as to produce a pull of 5 kN in the rod. The compound is then placed in a lathe and
the brass is turmed down to 4 mm thickness. Calculate the stresses in the two materials.
(Ans. 7 Nimm, 7.8 N/mm)
Тор
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