The size of abrasive grain required in a grinding wheel depends upon the
A. Amount of material to be removed
B. Hardness of material being ground
C. Finish desired
D. All of these
Answer: Option B
A. Amount of material to be removed
B. Hardness of material being ground
C. Finish desired
D. All of these
Answer: Option B
The carbide tools operating at very low cutting speeds (below 30 m/min)
A. Reduces tool life
B. Increases tool life
C. Have no effect on tool life
D. Spoils the work piece
The type of reamer used for reaming operation in a blind hole, is
A. Straight fluted reamer
B. Left hand spiral fluted reamer
C. Right hand spiral fluted reamer
D. Any one of these
High speed steel tools retain their hardness up to a temperature of
A. 250°C
B. 350°C
C. 500°C
D. 900°C
But RS khurmi book said D option (all of the above)
Why option B
I think it's Option D
Option d is correct
From the explanation the answer must be OPTION D but why they given the option as B
From the explanation the answer must be OPTION D but why they given the option as B
if coarse grain atructure then soft and ductile material to be ground
if fine grained structure of grinding wheel then hard and brittle material to be ground