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Tumbling method, for cleaning of sand and unwanted fins from the castings, can be used for thin castings with fragile or overhung segments.

Tumbling method, for cleaning of sand and unwanted fins from the castings, can be used for thin castings with fragile or overhung segments. Correct Answer False

In the tumbling method, the castings are kept in a barrel which is completely closed and then rotated on a horizontal axis at 30-40 rpm. Movement of casting removes the sand and unwanted fins. However, one precaution to be taken for tumbling is that the castings should be rigid with no frail or overhung segments, which may get knocked off during the tumbling operation.

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Cleaning is done by
(i) Scraping and removal in filters slow sand
(ii) Back washing in slow sand filters
(iii) Scraping and removal in filters rapid sand
(iv) Back washing in rapid sand filters
The correct answer is
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Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
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