Engineering Materials Mcqs - Set 9

1)   Foundry crucible is made of_________________?

a. mild steel
b. german silver
c. lead
d. cast iron
e. graphite
Answer  Explanation 

ANSWER: graphite

Explanation:
No explanation is available for this question!


2)   Aluminium bronze contains__________________?

a. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
b. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
c. 10% aluminium and 90% copper
d. 90% magnesium and 9% aluminium with some copper
e. 10% aluminium and 90% tin
Answer  Explanation 

ANSWER: 10% aluminium and 90% copper

Explanation:
No explanation is available for this question!


3)   The correct composition of Babbit metal is__________________?

a. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
b. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
c. 87% Sn, 4% Cu, 8% Sb, 1% Al
d. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
e. none of the above
Answer  Explanation 

ANSWER: 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

Explanation:
No explanation is available for this question!


4)   Neutral solution is one which has pH value__________________?

a. greater than 7
b. less than 7
c. equal to 7
d. pH value has nothing to do with neutral solution
e. none of the above
Answer  Explanation 

ANSWER: equal to 7

Explanation:
No explanation is available for this question!


5)   Basic solution is one which has pH value___________________?

a. greater than 7
b. equal to 7
c. less than 7
d. pH value has nothing to do with basic solution
e. none of the above
Answer  Explanation 

ANSWER: greater than 7

Explanation:
No explanation is available for this question!


6)   Recrystallisation temperature can belowered by_________________?

a. purification of metal
b. grain refinement
c. working at lower temperature
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


7)   Austenite rs a combination of_________________?

a. ferrite and cementite
b. cementite and gamma iron
c. ferrite and austenite
d. ferrite and iron graphite
e. pearlite and ferrite
Answer  Explanation 

ANSWER: cementite and gamma iron

Explanation:
No explanation is available for this question!


8)   Lead is poured into the joint between two pipes. These pipes may be made of____________________?

a. cast iron
b. vitrified clay
c. asbestos cement
d. concrete
e. mild steel
Answer  Explanation 

ANSWER: cast iron

Explanation:
No explanation is available for this question!


9)   Pearlite is a combination of___________________?

a. ferrite and cementite
b. cementite and gamma iron
c. ferrite and austenite
d. ferrite and iron graphite
e. pearlite and ferrite
Answer  Explanation 

ANSWER: ferrite and cementite

Explanation:
No explanation is available for this question!


10)   The transistor is made of___________________?

a. silver
b. gold
c. copper
d. germanium
e. german silver
Answer  Explanation 

ANSWER: germanium

Explanation:
No explanation is available for this question!


11)   Following elements have face-centred cubic structure__________________?

a. gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
b. Mg, Zn, Ti, Zr, Br, Cd
c. a iron (below 910°C and between 1400 to 1539°C), W
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

Explanation:
No explanation is available for this question!


12)   Acidic solution is one which has pH value__________________?

a. greater than 7
b. less than 7
c. equal to 7
d. pH value has nothing to do with neutral solution
e. none of the above
Answer  Explanation 

ANSWER: less than 7

Explanation:
No explanation is available for this question!


13)   Babbit metal is a_________________?

a. lead base alloy
b. tin base alloy
c. copper base alloy
d. all of the above
e. A. and C. above
Answer  Explanation 

ANSWER: A. and C. above

Explanation:
No explanation is available for this question!


14)   Age-hardening is related with______________?

a. stainless steel
b. gun metal
c. german silver
d. duralumin
e. cast iron
Answer  Explanation 

ANSWER: duralumin

Explanation:
No explanation is available for this question!


15)   Dow metal contains____________________?

a. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
b. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
c. 90% aluminium and 90% copper
d. 90% magnesium and 9% aluminium with some copper
e. 90% magnesium and 10% tin
Answer  Explanation 

ANSWER: 90% magnesium and 9% aluminium with some copper

Explanation:
No explanation is available for this question!


16)   German silver contains_________________?

a. 1% silver
b. 2.5% silver
c. 5% silver
d. 10% silver
e. 100% silver
Answer  Explanation 

ANSWER: 5% silver

Explanation:
No explanation is available for this question!


17)   Constantant an alloy used in thermocouples is an alloy of __________________?

a. copper and tin
b. copper and zinc
c. copper and iron
d. copper and nickel
e. copper and chromium
Answer  Explanation 

ANSWER: copper and nickel

Explanation:
No explanation is available for this question!


18)   Addition of lead and bismuth to aluminium results in_________________?

a. improvement of casting characteristics
b. improvement of corrosion resistance
c. one of the best known age and precipitation-hardening systems
d. improving machinability
e. none of the above
Answer  Explanation 

ANSWER: improving machinability

Explanation:
No explanation is available for this question!


19)   Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element__________________?

a. iron
b. copper
c. aluminium
d. zinc
e. nickel
Answer  Explanation 

ANSWER: nickel

Explanation:
No explanation is available for this question!


20)   Addition of copper to aluminium results in_____________________?

a. improvement of casting characteristics
b. improvement of corrosion resistance
c. one of the best known age and precipitation-hardening systems
d. improving machinability
e. none of the above
Answer  Explanation 

ANSWER: one of the best known age and precipitation-hardening systems

Explanation:
No explanation is available for this question!