ISRO Technician-B Fitter Question Paper - 2017 (Set

ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key

46) In oxy acetylene welding which gas is closed first to avoid back fire

Answer is:

Acetylene

Explanation:

In oxy acetylene welding Acetylene gas is closed first to avoid back fire.

In oxy acetylene welding which gas is closed first to avoid back fire

47) In oxy-acetylene gas cutting the metal cutting is done by

Answer is:

High pressure oxygen

48) Iron with 0.008 % to 0.025 % carbon is known as

Answer is:

Ferrite

49) The lower critical point (heating) for steel is at

Answer is:

723 degree celsius

Explanation:

The lower critical temperature is same for all steels
Lower critical temperature for steel’s austenite-to-pearlite transformation is 1333 ºF (723 ºCelsius). Below this temperature, austentite doesn’t exist.

50) In forging a drift is used for

Answer is:

46) In oxy acetylene welding which gas is closed first to avoid back fire

Acetylene

47) In oxy-acetylene gas cutting the metal cutting is done by

High pressure oxygen

48) Iron with 0.008 % to 0.025 % carbon is known as

Ferrite

49) The lower critical point (heating) for steel is at

723 degree celsius

50) In forging a drift is used for

Enlarging a punched hole