1) At critical speed of rotation, ball mill rotates at
a. high speed
b. low speed
c. neither slow nor very high speed
d. none of the above
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2) Which of the following statements is/are true?
a. Reduction method produces iron powders which are perfectly spherical
b. Drawback of high oxide formation in shotting processes can be reduced with use of inert gases
c. At certain temperature and pressure carbonyl of metal decomposes to give water and metal
d. All of the above
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Answer
Explanation
Related Ques
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ANSWER: Drawback of high oxide formation in shotting processes can be reduced with use of inert gases
Explanation:
No explanation is available for this question!
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3) What is meant by atomization?
a. Process of disintegrating molten metal into small particles by use of compressed air
b. Process of fusing small particles of metals into molten mass by water
c. None of the above
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Answer
Explanation
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ANSWER: Process of disintegrating molten metal into small particles by use of compressed air
Explanation:
No explanation is available for this question!
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4) In physico - chemical processes, which factors affect reduction method?
a. Size of particles
b. Shape of materials
c. Reducing agent
d. All of the above
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5) Different conditions favoring electro deposition are
a. low current density
b. high temperature
c. high viscosity
d. All of these
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6) Which of the following statements is/are false?
a. Temperature lower than 157 oC is cryogenic temperature
b. Impact test measures notch toughness
c. Nickel base steels are used for low temperature applications
d. All the above statements are false
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Answer
Explanation
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ANSWER: Temperature lower than 157 oC is cryogenic temperature
Explanation:
No explanation is available for this question!
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7) Biosensors are used in
a. medical field
b. agricultural field
c. pollution monitoring
d. all of the above
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8) What is meant by Nil Ductility Transition Temperature (NDT)?
a. Metal gets transformed from brittle to ductile phase
b. Metal gets transformed from ductile to brittle phase
c. Metal gets transformed from malleable to ductile phase
d. Metal gets transformed from elastic to ductile phase
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Answer
Explanation
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ANSWER: Metal gets transformed from ductile to brittle phase
Explanation:
No explanation is available for this question!
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9) What is the effect of high temperatures on material properties?
a. loss of cohesive strength
b. increase in stiffness
c. increase in hardness
d. All of the above
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10) What causes transformation of deformed martensite into austenite phase?
a. Heating
b. Cooling
c. both a. and b.
d. all of the above
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11) What is meant by low angle boundary?
a. Low angle boundary represents a boundary between crystalline region and its surroundings
b. Low angle boundary is a surface defect which has angular misorientation between the grains
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Low angle boundary is a surface defect which has angular misorientation between the grains
Explanation:
No explanation is available for this question!
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12) Which process is used to remove internal stresses from a metal?
a. Annealing
b. Cold working
c. Both a. and b.
d. None of the above
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13) Select the correct option which shows mechanical property of ceramic materials?
a. Non-crystalline ceramics become brittle below recrystallization temperature
b. At high temperatures ceramics have favorable properties
c. Ceramic products are resistant to oxidation
d. Ceramics can be used as a moderator
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Answer
Explanation
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ANSWER: Non-crystalline ceramics become brittle below recrystallization temperature
Explanation:
No explanation is available for this question!
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14) Ceramics having nuclear applications can be used as
a. moderators
b. controls
c. Both a. and b.
d. None of the above
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15) Match the following group 1 items with group 2 items and select the correct option
1. Durometers ---------------------------------------------- A. Value of modulus of rigidity
2. Brinell Hardness test ---------------------------------- B. To verify formability
3. Torsion test----------------------------------------------- C. Hardness of non-metallic materials like plastics
4. Erichsen cupping test ---------------------------------- D. Hardness of soft and ductile materials
a. 1 – D, 2 – B, 3 – A, 4 – C
b. 1 – C, 2 – D, 3 – A, 4 – B
c. 1 – B, 2 – A, 3 – D, 4 – C
d. 1 – D, 2 – A, 3 – B, 4 – C
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16) What is the effect of L/D ratio on compressive strength?
a. compressive strength increases and then remains constant as L/D ratio increases
b. compressive strength decreases and then increases as L/D ratio increases
c. compressive strength decreases and then remains constant as L/D ratio increases
d. none of the above
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Answer
Explanation
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ANSWER: compressive strength decreases and then remains constant as L/D ratio increases
Explanation:
No explanation is available for this question!
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17) Which of the following statements is/are false?
1. Ball indenter in Rockwell hardness test is made of diamond
2. Brale indenter in Rockwell hardness test is made of diamond
3. Micro hardness test is used to measure hardness of thin brittle materials
a. Only 1
b. Only 2
c. Only 3
d. All the statements are false
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18) What does primary creep in creep curve indicate?
a. Due to down deformation, resistance of metal increases
b. Due to down deformation, resistance of metal decreases
c. It represents high strain rate
d. It represents creep at constant rate
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Answer
Explanation
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ANSWER: Due to down deformation, resistance of metal increases
Explanation:
No explanation is available for this question!
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19) What are the metal requirements to have creep resistance property?
a. Low melting point
b. High oxidation resistance
c. Both a. and b.
d. None of the above
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20) Which type of microscope is used to determine particle diameter between (10 to 0.001 μ)?
a. Optical microscope
b. Electron microscope
c. Both a. and b.
d. None of the above
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21) What is meant by specific surface?
a. surface area per unit volume
b. surface area per unit weight
c. surface weight per unit area
d. none of the above
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