ISO Designation of Grinding Wheel

Q. The standard specification of a grinding wheel is
$A-46-M-6-V-21$. It means a wheel of

1. Aluminum oxide of mesh size $6$
2. Boron carbide of mesh size $46$
3. Aluminum oxide of mesh size $46$
4. Silicon carbide of mesh size $6$

Q. Abrasive material used in grinding wheel selected for grinding ferrous alloys is

1. $SiC$
2. Diamond
3. $A{l}_2{O}_3$
4. Boron carbide

Q. If the abrasive grain is viewed as a cutting tool, then which of the following represents the cutting parameters in common grinding operations?

1. Large negative rake angle, low shear angle and high cutting speed
2. Large positive rake angle, low shear angle and high cutting speed
3. Large negative rake anlge, high shear angle and low cutting speed
4. Zero negative rake angle, high shear angle and high cutting speed

Q. Which one of the following is not a synthetic abrasive material?

1. Silicon carbide
2. Aluminum oxide
3. Titanium nitride
4. Cubic boron nitride

Q. A grinding wheel $A27K7V$ is specified for finished grinding of a $HSS$ cutting tool. What do you understand about the wheel from the abvoe code. Is this an appropriate choice?

1. yes
2. no, because abrasive is not correct
3. no, grain sisze is not correct
4. no, because grade is not correct choice

Q. The base of a brass bracket needs rough grinding. For this purpose, the most suitable grinding wheel grade specification is

1. A50G8V
2. C30Q12V
3. A30D12V
4. C90J4B

Q. The base of a brass bracket has to be rough ground to remove the unevenness. The $4$ wheels available in the store. The appropriate wheel is

1. $A30K12V$
2. $C90M4B$
3. $C30Q12V$
4. $C50G8V$

Q. In a grinding wheel marked with $AA-48-L-7-V-25-L$ refers to

1. abrasive type
2. wheel sturcture
3. wheel hardness
4. manufactures code