1. An engine running at 150 rpm drives a line shaft by means of a belt. The enginepulley is 750 mm diameter and the pulley on the line shaft is 450 mm. A 900mm diameter pulley on the line shaft drives a 150 mm diameter pulley keyed toa dynamo shaft.Find the speed of dynamo shaft, when:1. There is no slip,2. There is a slip of 2% at each drive.150L 900( 3 )( 4 )750Dynamo Shaft(1 )( 2 )Line ShaftEngine Shaft4502. A leather belt 9 mm x 250 mm is used to drive a cast iron pulley 900 mm indiameter at 336 rpm. If the active arc on the smaller pulley is 120° and thestress in tight side is 2 MPa, find the power capacity of the belt. The density ofleather may be taken as 980 kg/m*, and the coefficient of friction of leather oncast iron is 0.35.?3. A flat belt is required to transmit 30 kW from a pulley of 1.5 m effective diameterrunning at 300 rpm. The angle of contact is spread over 11/24 of thecircumference. The coefficient of friction between the belt and pulley surface is0.3. Determine, taking centrifugal tension into account, width of the beltrequired.It is given that the belt thickness is 9.5 mm, density of its material is 1100 kg/m3and the related permissible working stress is 2.5 MPa.4. Determine the size of a rubber belt to drive a dynamo generating 20 kW at 2250rpm. and fitted with a pulley 200 mm diameter. Assume dynamo efficiency tobe 85%.Allowable stress for belt = 2.1 MPaDensity of rubber = 1000 kg/m3Angle of contact for dynamo pulley = 165°Coefficient of friction between belt and pulley = 0.Determine(a) minimum number of passes required, and(b) draft for each pass?

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1. An engine running at 150 rpm drives a line shaft by means of a belt. The engine pulley is 750 mm diameter and the pulley on the line shaft is 450 mm. A 900 mm diameter pulley on the line shaft drives a 150 mm diameter pulley keyed to a dynamo shaft. Find the speed of dynamo shaft, when: 1. There is no slip, 2. There is a slip of 2% at each drive. 150 900 ( 3) ( 4) 750 Dynamo Shaft (1) H ( 2) Line Shaft Engine Shaft 450

1. An engine running at 150 rpm drives a line shaft by means of a belt. The engine pulley is 750 mm diameter and the pulley on the line shaft is 450 mm. A 900 mm diameter pulley on the line shaft drives a 150 mm diameter pulley keyed to a dynamo shaft. Find the speed of dynamo shaft, when: 1. There is no slip, 2. There is a slip of 2% at each drive. 150 900 ( 3) ( 4) 750 Dynamo Shaft (1) H ( 2) Line Shaft Engine Shaft 450

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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Concept explainers

Design of Shafts and Shaft Components

The shaft is basically defined as the machine element that rotates, is in circular cross-section, it is majorly used to transfer the power from one part of the system to another, or from a power generating machine to a power absorbing machine. The shaft is supported on bearings and is rotated with the help of a set of gears or pulleys that are used for the power transmission. Bending moment, torsion, and an axial force act upon the shaft. Designing of shaft primarily involves determining stresses at a critical point in the shaft that is arising due to loading.

Question

1. An engine running at 150 rpm drives a line shaft by means of a belt. The engine
pulley is 750 mm diameter and the pulley on the line shaft is 450 mm. A 900
mm diameter pulley on the line shaft drives a 150 mm diameter pulley keyed to
a dynamo shaft.
Find the speed of dynamo shaft, when:
1. There is no slip,
2. There is a slip of 2% at each drive.
150
L 900
( 3 )
( 4 )
750
Dynamo Shaft
(1 )
( 2 )
Line Shaft
Engine Shaft
450
2. A leather belt 9 mm x 250 mm is used to drive a cast iron pulley 900 mm in
diameter at 336 rpm. If the active arc on the smaller pulley is 120° and the
stress in tight side is 2 MPa, find the power capacity of the belt. The density of
leather may be taken as 980 kg/m*, and the coefficient of friction of leather on
cast iron is 0.35.?
3. A flat belt is required to transmit 30 kW from a pulley of 1.5 m effective diameter
running at 300 rpm. The angle of contact is spread over 11/24 of the
circumference. The coefficient of friction between the belt and pulley surface is
0.3. Determine, taking centrifugal tension into account, width of the belt
required.
It is given that the belt thickness is 9.5 mm, density of its material is 1100 kg/m3
and the related permissible working stress is 2.5 MPa.
4. Determine the size of a rubber belt to drive a dynamo generating 20 kW at 2250
rpm. and fitted with a pulley 200 mm diameter. Assume dynamo efficiency to
be 85%.
Allowable stress for belt = 2.1 MPa
Density of rubber = 1000 kg/m3
Angle of contact for dynamo pulley = 165°
Coefficient of friction between belt and pulley = 0.
Determine
(a) minimum number of passes required, and
(b) draft for each pass?

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Hi, I need help with this question.
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For the steel shaft shown in Fig. Draw a torque diagram for the shaft. 17 ft kip 60 ft-kip 12 ft-kip 10 ft-kip 25 ft-kip