Pressure of Oxygen during pre-heating shall be? (i) 4.0 – 5.0 kg/ sq cm (ii) 5.0 – 6.0 kg/ sq cm (iii) 6.0 – 7.0 kg/ sq cm (iv) 7.0 – 8.0 kg/ sq cm * Answer : (iv) 7.0 – 8.0 kg/ sq cm *...
Heating time with compressed air and petrol in SPW is ? (i) 4.0 to 4.5 minutes.* (ii) 4.0 to 5 minutes (iii) 5.0 to 5.5 minutes (iv) 5.5 to 6 minutes Answer : (i) 4.0 to 4.5 minutes.*...
ressure of LPG during pre-heating shall be? (i) 2.0 - 2.5 kg/ sq cm (ii) 2.0 - 2.5 kg/ sq cm (iii) 2.0 - 2.5 kg/ sq cm* (iv) 2.0 - 2.5 kg/ sq cm Answer : (iii) 2.0 - 2.5 kg/ sq cm*...
What are the recognized systems for pre heating of rails ends for AT Welding? (i) Oxygen –LPG & Compressed air petrol both* (ii) Only Oxygen –LPG (iii) Only Compressed air petrol both (iv) both are correct Answer : ) Oxygen –LPG & Compressed air petrol both*...
Colour of rail ends becomes after preheating ? (i) Golden * (ii) Pink Red (iii) Red (iv) Yellow Answer : (i) Golden...
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