Pre test

1.What is the purpose of mounting the sample?

      
  1. To protect fragile or coated materials.
    2. 
  
  2. To obtain edge perfect retention.
    3. 
  
  3. To facilitate easy handling.
    4. 
  
  4. All the above
    5.

2. Thermoplastic resin harden when

      
  1. Pressure is applied
    2. 
  
  2. heat is applied
    3. 
  
  3. Reacting with suitable catalyst
    4. 
  
  4. None of the above
    5.

3.what is the temperature range required for the mounting process?

      
  1. Around 170degreecelsius
    2. 
  
  2. Around 180degreecelsius
    3. 
  
  3. Around 190degreecelsius
    4. 
  
  4. Around 200degreecelsius
    5.

4.which thermoplastic resin is used for mounting a specimen in metallography?

      
  1. Acetal copolymer polyoxymethylene
    2. 
  
  2. Lucite
    3. 
  
  3. polysterene
    4. 
  
  4. polycarbonnate
    5.

5.what type of reaction takes place when hardener and resin is mixed during cold mounting?

      
  1. Condensation reaction
    2. 
  
  2. Polymerisation
    3. 
  
  3. Substitution reaction
    4. 
  
  4. Decomposition
    5.

ANSWER KEY:

1.d) 2.b) 3.b) 4.b) 5.b)