a) Determine the number of V-belts required to transmit the power if each belt has a cross-sectional area of 375 mm², density 1000 kg/m² and an allowable tensile stress of 2.5 MPa. The groove angle of the pulleys is 35°. The coefficient of friction between the belt and the pulley is 0.25. b) Calculate also the length required of each belt.

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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Figure TQ3.4 shows the arrangement of a compressor, requiring 90 kW, is to run at
about 250 rpm. The drive is by V-belts from an electric motor running at 750 rpm. The
diameter of the pulley on the compressor shaft must not be greater than 1 metre while
the centre distance between the pulleys is limited to 1.75 metre. The belt speed should
not exceed 1600 m/min.
a) Determine the number of V-belts required to transmit the power if each belt has
a cross-sectional area of 375 mm?, density 1000 kg/m? and an allowable tensile
stress of 2.5 MPa. The groove angle of the pulleys is 35°. The coefficient of
friction between the belt and the pulley is 0.25.
b) Calculate also the length required of each belt.
(n – n)?
L = 1 (m + n) + 2x +
Motor pulley
x = 1.75 m
- Compressor pulley
Figure TQ3.4
Note:
The relationship between T, and T, for V-belt drive is
2.3 log (T,/ T,) = µ.0 cosec ß
Fabric and
rubber cover
Fabrie
Cords
Rubber
e 28/
Transcribed Image Text:Figure TQ3.4 shows the arrangement of a compressor, requiring 90 kW, is to run at about 250 rpm. The drive is by V-belts from an electric motor running at 750 rpm. The diameter of the pulley on the compressor shaft must not be greater than 1 metre while the centre distance between the pulleys is limited to 1.75 metre. The belt speed should not exceed 1600 m/min. a) Determine the number of V-belts required to transmit the power if each belt has a cross-sectional area of 375 mm?, density 1000 kg/m? and an allowable tensile stress of 2.5 MPa. The groove angle of the pulleys is 35°. The coefficient of friction between the belt and the pulley is 0.25. b) Calculate also the length required of each belt. (n – n)? L = 1 (m + n) + 2x + Motor pulley x = 1.75 m - Compressor pulley Figure TQ3.4 Note: The relationship between T, and T, for V-belt drive is 2.3 log (T,/ T,) = µ.0 cosec ß Fabric and rubber cover Fabrie Cords Rubber e 28/
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