Engineering Materials
1. A cold chisel is made of
- mild steel
- cast iron
- H.S.S.
- high carbon
- german silver.
Correct answer: (D)
high carbon
2. A material is known as allotropic or polymorphic if it
- has a fixed structure under all conditions
- exists in several crystal forms at different temperatures
- responds to heat treatment
- has its atoms distributed in a random pattern
- none of the above.
Correct answer: (B)
exists in several crystal forms at different temperatures
3. A reversible change in the atomic structure of steel with corresponding change in the properties is known as
- molecular change
- physical change
- allotropic change
- solidus change
- atomic change.
Correct answer: (C)
allotropic change
4. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
- allotropic change
- recrystallisation
- heat treatment
- precipitation
- austem pering.
Correct answer: (A)
allotropic change
5. A specimen of aluminium metal when observed under microscope shows
- B.C.C. crystalline structure
- F.C.C. crystal structure
- H.C.P. structure
- a complex cubic structure
- orthorhombic crystalline structure.
Correct answer: (B)
F.C.C. crystal structure
6. Acidic solution is one which has pH value
- greater than 7
- less than 7
- equal to 7
- pH value has nothing to do with neutral solution
- none of the above.
Correct answer: (B)
less than 7
7. Addition of copper to aluminium results in
- improvement of casting characteristics
- improvement of corrosion resistance
- one of the best known age and precipitation-hardening systems
- improving machinability
- none of the above.
Correct answer: (E)
none of the above.
8. Addition of lead and bismuth to aluminium results in
- improvement of casting characteristics
- improvement of corrosion resistance
- one of the best known age and precipitation-hardening systems
- improving machinability
- none of the above.
Correct answer: (D)
improving machinability
9. Addition of manganese to aluminium results in
- improvement of casting characteristics
- improvement of corrosion resistance
- one of the best known age and precipitation-hardening systems
- improving machinability
- none of the above.
Correct answer: (B)
improvement of corrosion resistance
10. Addition of silicon to aluminium results in
- improvement of casting characteristics
- improvement of corrosion resistance
- one of the best known age and precipitation-hardening systems
- improving machinability
- none of the above.
Correct answer: (A)
improvement of casting characteristics