railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Joining Welding

The ratio of acetylene to oxygen is approximately ______ for a neutral flame used in gas welding.

1

1 ∶ 1

2

1 ∶ 2

3

1 ∶ 3

4

1.5 ∶ 1

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