Glazing in grinding wheels takes place when the

1.	Glazing in grinding wheels takes place when the
A.	Wheel is too hard or wheel revolves at a very high speed
B.	Wheel is too soft or wheel revolves at a very slow speed
C.	Wheel is too hard and wheel revolves at very slow speed
D.	Wheel is too soft and wheel revolves at a very high speed
Answer» B. Wheel is too soft or wheel revolves at a very slow speed

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Glazing in grinding wheels takes place when the

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