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GATE Mechanical 1988 Question

Signle Correct Answer
The standard specification of a grinding wheel is $$A-46-M-6-V-21.$$ It means a wheel of
A
Aluminium oxide of mesh size $$6$$
B
Boron carbide of mesh size $$46$$
C
Aluminium oxide of mesh size $$46$$
D
Silicon carbide of mesh size $$6$$

GATE Mechanical 1988 Question

Answer by Yourself
In twist drills ......... (small/large) point angle and ........ (small/large) helix angle are provided for drilling soft, low strength steel.

GATE Mechanical 1988 Question

Signle Correct Answer
Cutting speed in grinding is set to a high value to
A
Reduce the cutting time
B
Increase the bond strength
C
Improve cooling of job and wheel
D
Reduce the wheel wear

GATE Mechanical 1989 Question

Signle Correct Answer
Gear hobbing produces more accurate gears than milling because in hobbing
A
There is a continuous indexing operation
B
Pressure angle is larger than in milling
C
Hob and work piece both are rotating
D
A special multi-tooth cutter (hob) is used

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