What is the Shelf life of mould ? (i) 6 months minimum. (ii) 8 months minimum (iii) 9 months minimum* (iv) 12 months minimum Answer : (iii) 9 months minimum*...
If digital DRT is calibrated for 300 mm longitudinal wave using 00 double crystal probe then 60kg rail ---------peak will appear at (i) 5.2 (ii) 5.7* (iii) 7.8 (iv) 8.6 Answer : ii) 5.7*...
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 *...
How many nos. of sleepers should be loosened either side of the proposed weld? (i) 3 sleepers (ii) 5 sleepers.* (iii) 2 sleepers (iv) 4 sleepers Answer : (ii) 5 sleepers....
What is the testing frequency of new AT weld ? (i) Just after the welding (ii) After 7 days of welding (iii) With in the one month of welding* (iv) None of the above Answer : iii) With in the one month of welding*...
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