Concrete mixer are generally designed to run at a speed of ……….. Revolution per minute.

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Manisha Agrawal

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📊 Advance Construction Technology

Q. Concrete mixer are generally designed to run at a speed of ……….. Revolution per minute.

(A) 40 to 50
(B) 30 to 40
(C) 15 to 20
(D) 20 to 30

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✅ Correct Answer: (C) 15 to 20

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