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MCQs 1: At critical speed of rotation, ball mill rotates at

high speed low speed neither slow nor very high speed none of the above
Answer Explanation

MCQs 2: Which of the following statements is/are true?

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
Answer Explanation

MCQs 3: What is meant by atomization?

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 Both A & B None of the above
Answer Explanation

MCQs 4: In physico - chemical processes, which factors affect reduction method?

Size of particles Shape of materials Reducing agent All of the above
Answer Explanation

MCQs 5: Different conditions favoring electro deposition are

low current density high temperature high viscosity All of these
Answer Explanation

MCQs 6: Which of the following statements is/are false?

Temperature lower than 157 °C is cryogenic temperature Impact test measures notch toughness Nickel base steels are used for low temperature applications All the above statements are false
Answer Explanation

MCQs 7: Biosensors are used in

medical field agricultural field pollution monitoring all of the above
Answer Explanation

MCQs 8: What is meant by Nil Ductility Transition Temperature (NDT)?

Metal gets transformed from brittle to ductile phase Metal gets transformed from ductile to brittle phase Metal gets transformed from malleable to ductile phase Metal gets transformed from elastic to ductile phase
Answer Explanation

MCQs 9: What is the effect of high temperatures on material properties?

loss of cohesive strength increase in stiffness increase in hardness All of the above
Answer Explanation

MCQs 10: What causes transformation of deformed martensite into austenite phase?

Heating Cooling both a. and b. all of the above
Answer Explanation

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