In which of the following applications variable speed operation is preferred ?

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• In which of the following applications variable speed operation is preferred?
• For which of the following applications D.C. motors are still preferred?
• For which off the following applications DC motors are still preferred?
• Which of the following motors is preferred when quick speed reversal is the main consideration?
• Which of the following motors is preferred when quick speed reversal is the main consideration?
• Which off the following motors is preferred when a smooth and resize speed control over a wide range is desired?
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• Which ofthefollowing motors is preferred when smooth and precise speed control over a wide range is desired ?
• When smooth and precise speed control over a wide range is desired, the motor preferred is
• When quick speed reversal is a consideration, the motor preferred is