MCQs Test on Size Reduction.

 

MCQs Test on Size Reduction

Quiz

 

1. Which of the following is NOT a method used for size reduction?
   
   1.   Cutting
   2.   Impact
   3.   Burning
   4.   Shear
2. Mechanism on which Ball Mill operates is -----
   1.   Impact
   2.   Attrition
   3.   Impact & Attrition
   4.   None of the above
3. Mechanism on which Fluid Energy Mill operates is -----
   
   1.   Impact
   2.   Attrition
   3.   Combined Impact & Attrition
   4.   None of the above
4. Mechanism on which Hammer Mill operates is -----
   
   1.   Impact
   2.   Attrition
   3.   Impact & Attrition
   4.   Cutting
5. Mechanism on which Cutter Mill operates is -----
   1.   Impact
   2.   Attrition
   3.   Impact & Attrition
   4.   Cutting
6. Which of the following uses the attrition mechanism?
   1.   Plate Mill
   2.   Fluid Energy Mill
   3.   Ball Mill
   4.   All of the above
7. Fluid energy mill is also known as,
   1.   Micronizer
   2.   Jet mil
   3.   Pulverizer
   4.   All of the above
8. End runner mill works on the principle of __________
   
   1.   Crushing and friction
   2.   Cutting and attrition
   3.   Impact & attrition
   4.   Crushing & Shear
9. Cutter mill may be fitted with__________ knives.
   1.   Stationary
   2.   Rotary
   3.   Both a & b
   4.   None of the above
10. Size reduction is also called “Communition”
    1.   True
    2.   False
11. The Ball Mill cylinder contains metallic balls occupying around ------ of total capacity.
    
    1.   30 to 50%
    2.   40 to 50%
    3.   20 to 30%
    4.   30 to 60%
12. Which statement is TRUE for Ball Mill?
    1.   If the machine is rotated at low speed the balls collide with each other and no or negligible size reduction takes place.
    2.   If the machine is rotated at very high speed the balls rotate along the cylinder wall due to centrifugal force and no size reduction takes place.
    3.   The mill is rotated at an optimum speed for effective size reduction.
    4.   All of the above
13. Fluid energy mill produces particle size in ---- range?
    1.   1 to 20-micron size
    2.   1 to 20-mm size
    3.   10 to 20-micron size
    4.   10 to 20-mm size
14. Which of the following mills is free from wear & tear?
    1.   Ball Mill
    2.   Cutter Mill
    3.   Roller Mill
    4.   Micronizer
15. Moisture content plays an important role in size reduction, which of the following sentences is true regarding this?
    
    1.   Usually 5% moisture in dry grinding is necessary for an effective size reduction.
    2.   Usually 15% moisture in dry grinding is necessary for an effective size reduction.
    3.   50% moisture in wet grinding is considered good for size reduction.
    4.   Both a & c