86. Bentonite is commonly used bonding material for dry sand cores

1. 1. Bentonite is an additive.

   
   
   

   2. Bentonite is an non-additive.

   
   
   

   3. Both A and B

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   Bentonite is an additive.

   Correct Option: A

   Bentonite is an additive.

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87. Electrical switches made out of thermoset materials are produced by

1. 1. Compression moulding

   
   
   

   2. Transfer moulding

   
   
   

   3. Injection moulding

   
   
   

   4. Vacuum moulding

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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88. Investment casting uses... A as pattern material and is preferred for small parts with .... B ____designs. A. wax/resin coated sand B. simple/intricate

1. 1. A. wax B. intricate

   
   
   

   2. B. wax A. intricate

   
   
   

   3. A. wax B.

   
   
   

   4. B. wax A.

   
   
   

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1. View Hint View Answer Discuss in Forum

   A. wax B. intricate

   Correct Option: A

   A. wax B. intricate

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89. The number of atoms per unit cell and the number of slip systems, respectively, for a facecentered cubic (FCC) crystal are

1. 1. 3, 3

   
   
   

   2. 3, 12

   
   
   

   3. 4, 12

   
   
   

   4. 4 ,48

   
   
   

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1. View Hint View Answer Discuss in Forum

   No of atoms per unit cell in FCC ⇒
   
   

   =	1	× 8 (each corner) +	1	× 6 (each face) = 1 + 3 = 4
   	8		2

   
   No. of slip systems in FCC are 12.

   Correct Option: C

   No of atoms per unit cell in FCC ⇒
   
   

   =	1	× 8 (each corner) +	1	× 6 (each face) = 1 + 3 = 4
   	8		2

   
   No. of slip systems in FCC are 12.

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90. The crystal structure of aluminium is

1. 1. body-centred cubic

   
   
   

   2. face-centred cubic

   
   
   

   3. close-packed hexagonal

   
   
   

   4. body-centred tetragonal

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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