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Mr. Dubey • 53.53K Points
Coach 

Q. Which of these is not a type of drive of variable speed control?

(A) variable speed turbine
(B) hydraulic coupling
(C) multiple speed ac motor
(D) electronically adjustable turbine drive
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Explanation by: Mr. Dubey 
 except ‘electronically adjustable turbine drive’, all other are a type of drive in variable speed control.

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