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A band and block brake having 10 blocks, each of which subtends an angle of 14o at center, is applied to drum of effective diameter of 1 m. The brake drum and winding drum of crane mounted on the same shaft weighs 20 kN and have combined radius of gyration of 300 mm. The two ends of the band are attached to the pin on opposite side of the fulcrum. If an effort of 300 N is applied at distance of 800 mm from the fulcrum, find (i) Braking torque, (ii) the angular retardation of the brake, (iii) the time taken by the system to come to rest from the rated speed of 400 rpm. Take coefficient of friction between the drum and the block as 0.25.

A band and block brake having 10 blocks, each of which subtends an angle of 14o at center, is applied to drum of effective diameter of 1 m. The brake drum and winding drum of crane mounted on the same shaft weighs 20 kN and have combined radius of gyration of 300 mm. The two ends of the band are attached to the pin on opposite side of the fulcrum. If an effort of 300 N is applied at distance of 800 mm from the fulcrum, find (i) Braking torque, (ii) the angular retardation of the brake, (iii) the time taken by the system to come to rest from the rated speed of 400 rpm. Take coefficient of friction between the drum and the block as 0.25.

Elements Of Electromagnetics
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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A band and block brake having 10 blocks, each of which subtends an angle of 14o at center, is applied to
drum of effective diameter of 1 m. The brake drum and winding drum of crane mounted on the same
shaft weighs 20 kN and have combined radius of gyration of 300 mm. The two ends of the band are
attached to the pin on opposite side of the fulcrum. If an effort of 300 N is applied at distance of 800
mm from the fulcrum, find (i) Braking torque, (ii) the angular retardation of the brake, (iii) the time
taken by the system to come to rest from the rated speed of 400 rpm. Take coefficient of friction
between the drum and the block as 0.25.

BOO mm 125 -40 mm To Q No. 06
Transcribed Image Text:BOO mm 125 -40 mm To Q No. 06
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