Materials Science and Engineering

low current density ✘ high temperature ✘ high viscosity ✘ All of these ✔

Size of particles ✘ Shape of materials ✘ Reducing agent ✘ All of the above ✔

Process of disintegrating molten metal into small particles by use of compressed air ✘ Process of fusing small particles of metals into molten mass by water ✘ None of the above ✘

Reduction method produces iron powders which are perfectly spherical ✘ Drawback of high oxide formation in shotting processes can be reduced with use of inert gases ✘ At certain temperature and pressure carbonyl of metal decomposes to give water and metal ✘ All of the above ✔

high speed ✘ low speed ✘ neither slow nor very high speed ✘ none of the above ✔

Dye penetrant testing ✘ Visual testing ✘ Ultrasonic testing ✘ Magnetic particle test ✔

Probe test ✘ Bend liquid test ✘ Dye penetrant test ✘ None of the above ✔

cracks ✘ hardness ✘ conductivity ✘ All of the above ✔

Ultrasonic test ✘ Torsion test ✘ Eddy current test ✘ All of these tests can be used to determine dimensions of any object ✔

Low and high density regions absorb and transmit same amount of radiation ✘ High density region ✘ Low density region ✘ None of the above ✔