(a) Hard steel and nickel alloys

(b) Thin sheet metal

Both (A) and (B)

None of these

One tool bit on a bar

Two tool bits fitted on diametrically opposite sides of

Three tool bits equally spaced on a bar

Four or more tool bits

At the time of manufacture

Before grinding operation

After grinding operation

Frequently

2500-500

500-900

1000-1500

1500-2000

To achieve flatness

To achieve roundness

To improve surface finish

To obtain very smooth reflective surface