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QI/ A shaft rotating at 120 r.p.m is supported in bearing A and B, 1.8 m apart, A being at the left - hand end. Two unbalanced rotating masses of 7.5 kg and 10 kg at radii of 75 mm and 50 mm respectively are situated between A and B at distances of 0.6 m and 0.9 m respectively from A. The angle between the radii is 60° when viewed along the shaft. Answer the following questions: 1- The dynamic forces are 2- Forces on bearings A and B due to dead weight are and and 3- Resultant force at A and B are and 4- A rotor supported at A and B carries two masses. The rotor is (a) dynamically balanced (b) statically balanced (c) both (a)&(b) (d) none. ..... .. 5- The static balancing is satisfactory for low-speed rotors but with increasing

QI/ A shaft rotating at 120 r.p.m is supported in bearing A and B, 1.8 m apart, A being at the left - hand end. Two unbalanced rotating masses of 7.5 kg and 10 kg at radii of 75 mm and 50 mm respectively are situated between A and B at distances of 0.6 m and 0.9 m respectively from A. The angle between the radii is 60° when viewed along the shaft. Answer the following questions: 1- The dynamic forces are 2- Forces on bearings A and B due to dead weight are and and 3- Resultant force at A and B are and 4- A rotor supported at A and B carries two masses. The rotor is (a) dynamically balanced (b) statically balanced (c) both (a)&(b) (d) none. ..... .. 5- The static balancing is satisfactory for low-speed rotors but with increasing

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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QI/ A shaft rotating at 120 r.p.m is supported in bearing A and B, 1.8 m apart, A being at the left – hand end. Two unbalanced rotating masses of 7.5 kg and 10 kg at radii of 75 mm and 50 mm respectively are situated between A and B at distances of 0.6 m and 0.9 m respectively from A. The angle between the radii is 60° when viewed along the shaft. Answer the following questions: and 1- The dynamic forces are 2- Forces on bearings A and B due to dead weight are ........ and 3- Resultant force at A and B are ............ and 4- A rotor supported at A and B carries two masses. The rotor is (a) dynamically balanced (b) statically balanced (c) both (a)&(b) (d) none. 5- The static balancing is satisfactory for low-speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the (a) unbalanced couples are caused only at higher speeds (b) unbalanced forces are not dangerous at higher speeds (c) effects of unbalances are proportional to the square of the speed (d) effects of unbalances are directly proportional to the speed
Transcribed Image Text:QI/ A shaft rotating at 120 r.p.m is supported in bearing A and B, 1.8 m apart, A being at the left – hand end. Two unbalanced rotating masses of 7.5 kg and 10 kg at radii of 75 mm and 50 mm respectively are situated between A and B at distances of 0.6 m and 0.9 m respectively from A. The angle between the radii is 60° when viewed along the shaft. Answer the following questions: and 1- The dynamic forces are 2- Forces on bearings A and B due to dead weight are ........ and 3- Resultant force at A and B are ............ and 4- A rotor supported at A and B carries two masses. The rotor is (a) dynamically balanced (b) statically balanced (c) both (a)&(b) (d) none. 5- The static balancing is satisfactory for low-speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the (a) unbalanced couples are caused only at higher speeds (b) unbalanced forces are not dangerous at higher speeds (c) effects of unbalances are proportional to the square of the speed (d) effects of unbalances are directly proportional to the speed
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