are mounted on the Periphery of a cylinder that rotates inside a closed casing and concave. a) Dummy type c) spike-tooth type b) Hummer type d) Axial flow type

are mounted on the Periphery of a cylinder that rotates inside a closed casing and concave. a) Dummy type c) spike-tooth type b) Hummer type d) Axial flow type
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Answer :

spike-tooth type
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