WorksheetsMaterials Engineering 3
Total questions: 25
Worksheet time: 25mins
The percentage carbon content in wrought iron is about
0.02
2
0.1
0.4
Heavy duty leaf and coil springs contain carbon of the following order
0.2%
0.5%
0.8%
1.0%
The silicon steel is widely used for
Connecting rods
Cutting tools
Generators and transformers in the form of laminated cores
Motor car crankshafts
Blast furnace produces following by reduction of iron ore
Cast iron
Pig iron
Wrought iron
Malleable iron
For a steel containing 0.8% carbon
There is no critical point
There is only one critical point
There are two critical points
There can be any number of critical points
Nickel in steel
Improves wear resistance, cutting ability and toughness
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves cutting ability and reduces hardenability
Gives ductility, toughness, tensile strength and anti-corrosion properties
Which of the following impurity in cast iron makes it hard and brittle?
Silicon
Sulphur
Manganese
Phosphorus
Tensile strength of steel can be safely increased by
Adding carbon up to 2.8%
Adding carbon up to 6.3%
Adding carbon up to 0.83%
Adding small quantities of copper
Which of the following metal is used for nuclear energy?
Uranium
Thorium
Niobium
All of these
Cemented carbide tools are not found to be suitable for cutting
Brass
Cast iron
Aluminium
Steel
What is meant by specific surface?
surface area per unit volume
surface area per unit weight
surface weight per unit area
none of the above
Which type of microscope is used to determine particle diameter between (10 to 0.001 μ)?
Optical microscope
Electron microscope
Both a. and b.
None of the above
What are the metal requirements to have creep resistance property?
Low melting point
High oxidation resistance
Both a. and b.
None of the above
What does primary creep in creep curve indicate?
Due to down deformation, resistance of metal increases
Due to down deformation, resistance of metal decreases
It represents high strain rate
It represents creep at constant rate
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
Only 1
Only 2
Only 3
All the statements are false
What is the effect of L/D ratio on compressive strength?
compressive strength increases and then remains constant as L/D ratio increases
compressive strength decreases and then increases as L/D ratio increases
compressive strength decreases and then remains constant as L/D ratio increases
none of the above
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
1 – D, 2 – B, 3 – A, 4 – C
1 – C, 2 – D, 3 – A, 4 – B
1 – B, 2 – A, 3 – D, 4 – C
1 – D, 2 – A, 3 – B, 4 – C
Ceramics having nuclear applications can be used as
moderators
controls
Both a. and b.
None of the above
Select the correct option which shows mechanical property of ceramic materials?
Non-crystalline ceramics become brittle below recrystallization temperature
At high temperatures ceramics have favorable properties
Ceramic products are resistant to oxidation
Ceramics can be used as a moderator
Which process is used to remove internal stresses from a metal?
Annealing
Cold working
Both a. and b.
None of the above
What is meant by low angle boundary?
Low angle boundary represents a boundary between crystalline region and its surroundings
Low angle boundary is a surface defect which has angular misorientation between the grains
Both a. and b.
None of the above
What causes transformation of deformed martensite into austenite phase?
Heating
Cooling
both a. and b.
all of the above
What is the effect of high temperatures on material properties?
loss of cohesive strength
increase in stiffness
increase in hardness
All of the above
What is meant by Nil Ductility Transition Temperature?
Metal gets transformed from brittle to ductile phase
Metal gets transformed from ductile to brittle phase
Metal gets transformed from malleable to ductile phase
Metal gets transformed from elastic to ductile phase
Biomaterials are used in
medical field
agricultural field
pollution monitoring
all of the above
