1) The alloy of Ti + 5% Al, + 2.5 Sn has _______.
a. low temperature stability
b. low strength
c. good corrosion
d. all of the above
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Answer
Explanation
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ANSWER: good corrosion
Explanation:
No explanation is available for this question!
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2) In Muntz metal, if 1% of tin is added it forms _____
a. admiralty brass
b. naval brass
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: naval brass
Explanation:
No explanation is available for this question!
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3) What is the composition of cartridge brass?
a. 50 % Cu and 50 % Zn
b. 60 % Cu and 40 % Zn
c. 70 % Cu and 30 % Zn
d. 20 % Cu and 80 % Zn
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Answer
Explanation
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ANSWER: 70 % Cu and 30 % Zn
Explanation:
No explanation is available for this question!
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4) In precipitation hardening, at 540o C when θ phase (CuAl2) completely dissolves at grain boundaries the single phase α is obtained known as ____
a. saturated solid solution
b. homogeneous solid solution
c. heterogeneous solid solution
d. supersaturated solid solution
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Answer
Explanation
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ANSWER: homogeneous solid solution
Explanation:
No explanation is available for this question!
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5) At room temperature, hardness of precipitation hardening alloys ______
a. increases with time
b. decreases with time
c. remains constant
d. none of the above
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Answer
Explanation
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ANSWER: increases with time
Explanation:
No explanation is available for this question!
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6) The solubility of tin in copper above 580oC _______
a. decreases
b. increases
c. remains constant
d. none of the above
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Answer
Explanation
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ANSWER: decreases
Explanation:
No explanation is available for this question!
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7) Which of the following cold working operations are suitable for α brass?
a. Cold rolling
b. Deep drawing
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Both a. and b.
Explanation:
No explanation is available for this question!
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8) Inconol nickel alloy contains _________
a. 75% Ni, 15% Cr and 9% Fe
b. 75% Ni, 15% Cr and 9% Al
c. 75% Ni, 15% Cr and 9% Mg
d. None of the above
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Answer
Explanation
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ANSWER: 75% Ni, 15% Cr and 9% Fe
Explanation:
No explanation is available for this question!
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9) A bearing material should not possess the characteristic of high ______.
a. coefficient of friction
b. hardness
c. melting point
d. thermal conductivity
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Answer
Explanation
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ANSWER: coefficient of friction
Explanation:
No explanation is available for this question!
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10) Which of the following is α – β brass?
a. Admiralty brass
b. Brazing brass
c. Cartridge brass
d. All of the above
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Answer
Explanation
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ANSWER: Brazing brass
Explanation:
No explanation is available for this question!
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