1.

In gray iron castings of facing sand mixtures, what is the bentonite percentage composition?(a) 2-3%(b) 3-4%(c) 4-5%(d) 5-6%

Answer» Correct answer is (a) 2-3%

The explanation is: In gray cast irons of facing sand mixtures, the bentonite percentage composition is calculated to be 2-3%. Whereas, in the case of green sands, the bentonite percentage is recorded to be around 3.5%.


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