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What are the basic reasons for loss of residual magnetism? How do you get it? What is the requireable and maximum DC voltage is to be applied to get back the residual magnetism?
Ans. The reasons for loss of residual magnetism are taking the alternator in idle condition for long time and connecting field wires in wrong polarity. To get back the residual magnetism flash the field terminals for correct polarity of DC supply. The permissible DC voltage is to be applied to get back the residual magnetism is 6 to 12V DC. Highest voltage is 24V DC.
The wrench shown in the figure is designed for access to the bolt at O. The wrench lies in a vertical plane and a horizontal force of P27 (as in question 14) is applied at A perpe
Mach number is the ratio of velocity of source to the velocity of sound. Mach Number = Velocity of Source / Velocity of Sound .
what are the necessary conditions for a body to execute simple harmonic motion?
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