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By which of the following methods viscous friction can be added to a servomechanism ? | |
A. | Reducing shaft r.p.m. [Wrong Answer] |
B. | Increasing shaft r.p.m. [Wrong Answer] |
C. | Increasing the temperattuv of the coil [Wrong Answer] |
D. | Coupling a disc to shaft which is inunersed in a viscous medium [Correct Answer] |