Engineering Materials

1. ‘Killed steels’ are those steels

  1. which are destroyed by burning
  2. which after their destruction are recycled to produce fresh steel
  3. which are deoxidised in the ladle with silicon and aluminium
  4. in which carbon is completely burnt
  5. which have poor properties due to improper manufacturing.

Correct answer: (C)
which are deoxidised in the ladle with silicon and aluminium

2. A cold chisel is made of

  1. mild steel
  2. cast iron
  3. H.S.S.
  4. high carbon
  5. german silver.

Correct answer: (D)
high carbon

3. A material is known as allotropic or polymorphic if it

  1. has a fixed structure under all conditions
  2. exists in several crystal forms at different temperatures
  3. responds to heat treatment
  4. has its atoms distributed in a random pattern
  5. none of the above.

Correct answer: (B)
exists in several crystal forms at different temperatures

4. A reversible change in the atomic structure of steel with corresponding change in the properties is known as

  1. molecular change
  2. physical change
  3. allotropic change
  4. solidus change
  5. atomic change.

Correct answer: (C)
allotropic change

5. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

  1. allotropic change
  2. recrystallisation
  3. heat treatment
  4. precipitation
  5. austempering.

Correct answer: (A)
allotropic change

6. A specimen of aluminium metal when observed under microscope shows

  1. B.C.C. crystalline structure
  2. F.C.C. crystal structure
  3. H.C.P. structure
  4. a complex cubic structure
  5. orthorhombic crystalline structure.

Correct answer: (B)
F.C.C. crystal structure

7. Acidic solution is one which has pH value

  1. greater than 7
  2. less than 7
  3. equal to 7
  4. pH value has nothing to do with neutral solution
  5. none of the above.

Correct answer: (B)
less than 7

8. Addition of copper to aluminium results in

  1. improvement of casting characteristics
  2. improvement of corrosion resistance
  3. one of the best known age and precipitation-hardening systems
  4. improving machinability
  5. none of the above.

Correct answer: (C)
one of the best known age and precipitation-hardening systems

9. Addition of lead and bismuth to aluminium results in

  1. improvement of casting characteristics
  2. improvement of corrosion resistance
  3. one of the best known age and precipitation-hardening systems
  4. improving machinability
  5. none of the above.

Correct answer: (D)
improving machinability

10. Addition of manganese to aluminium results in

  1. improvement of casting characteristics
  2. improvement of corrosion resistance
  3. one of the best known age and precipitation-hardening systems
  4. improving machinability
  5. none of the above.

Correct answer: (B)
improvement of corrosion resistance

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