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Cascade method of speed control involves the use of two coupled induction motors. The necessary condition for speed control is that | |
A. | both the motors are of the wound rotor type having the same number of poles [Wrong Answer] |
B. | both the motors are of the squirrel cage rotor type having different number of poles [Wrong Answer] |
C. | one motor is of the slip-ring type but both the motors have the same number of poles [Wrong Answer] |
D. | one motor is of the slip-ring type and the two motors have different number of poles. [Correct Answer] |