41
Which of the following materials is not suitable as a die material for wire drawing?
A)
Diamond
B)
Tungsten carbide
C)
Tool steel
D)
Bronze
Answer & Solution
Answer: Option
D
42
Match the following
P. Nickel-silvers
1. Alloys of tin, antimony and copper used as a bearing material
Q. Nitralloys
2. Steel used for nitriding containing aluminium, chromium and molybed num
R. Babbits
3. Soft magnetic material used as electromagnet
S. Permalloy
4. Ternery alloys of copper, nickel and zinc with good cold formability
A)
P-4, Q-2, R-3, S-1
B)
P-4, Q-2, R-1, S-3
C)
P-4, Q-3, R-2, S-1
D)
P-1, Q-2, R-4, S-3
Answer & Solution
Answer: Option
B
43
When boron (trivalent) is doped to silicon, the resulting material is
A)
a p-type semiconductor
B)
an n-type semiconductor
C)
a superconductor
D)
an insulator
Answer & Solution
Answer: Option
A
44
The single most important requirement for a turbine blade material is
A)
damping
B)
resilience
C)
creep resistance
D)
DBTT
Answer & Solution
Answer: Option
C
45
The engineering stress-strain curve for a ceramic material is
A)
parabolic
B)
exponential
C)
logarithmic
D)
linear
Answer & Solution
Answer: Option
D
46
As mercury is cooled from room temperature to 3 K, its electrical behaviour changes from that of
A)
conductor to insulator
B)
semiconductor to insulator
C)
conductor to superconductor
D)
semiconductor to superconductor
Answer & Solution
Answer: Option
C
47
The material in which there is conduction primarily by holes is
A)
conductor
B)
insulator
C)
p-type semi-conductor
D)
n-type semi-conductor
Answer & Solution
Answer: Option
C
48
Match each application in
Group 1 with a material in
Group 2 .
Group 1 Group 2
P. Cores for electric motor
1. Y-Fe2 O3 particles
Q. stripe on credit cards
2. Barium titanate
R. Permanent magnets
3. COsSm intermetallic compound
S. Multilayer capacitors
4. Grain oriented silicon steel
A)
P-3, Q-1, R-2, S-4
B)
P-4, Q-1, R-3, S-2
C)
P-4, Q-1, R-2, S-3
D)
P-2, Q-1, R-3, S-4
Answer & Solution
Answer: Option
B
49
Which one of the following alloy systems exhibits complete solid solubility?
A)
Cu-Ni
B)
Fe-Cu
C)
Pb-Sn
D)
Cu-Zn
Answer & Solution
Answer: Option
A
50
Match the properties in
Group 1 with the metals in
Group 2 .
Group 1 Group 2
P. Ferromagnetism
1. Nb
Q. Superconductivity
2. Fe
R. Diamagnetism
3. Cu
S. Antiferromagnetism
4. Cr
A)
P-2, Q-4, R-3, S-1
B)
P-2, Q-1, R-3, S·4
C)
P-3, Q-4, R-1, S-2
D)
P-1, Q-2, R-3, S-4
Answer & Solution
Answer: Option
B
