Non Ferrous Metals Alloys - Mechanical Engineering (MCQ) questions and answers

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
Answer  Explanation 

ANSWER: good corrosion

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: naval brass

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: 70 % Cu and 30 % Zn

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: homogeneous solid solution

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: increases with time

Explanation:
No explanation is available for this question!


6)   The solubility of tin in copper above 580oC _______

a. decreases
b. increases
c. remains constant
d. none of the above
Answer  Explanation 

ANSWER: decreases

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: Both a. and b.

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: 75% Ni, 15% Cr and 9% Fe

Explanation:
No explanation is available for this question!


9)   A bearing material should not possess the characteristic of high  ______.

a. coefficient of friction
b. hardness
c. melting point
d. thermal conductivity
Answer  Explanation 

ANSWER: coefficient of friction

Explanation:
No explanation is available for this question!


10)   Which of the following is α – β brass?

a. Admiralty brass
b. Brazing brass
c. Cartridge brass
d. All of the above
Answer  Explanation 

ANSWER: Brazing brass

Explanation:
No explanation is available for this question!