Multiple Choice Questions (MCQ) on Casting

In permanent mould casting, the moulds are usually coated with a refractory wash and then lamp black to

  1. Reduce chilling effect
  2. To prevent shrinkage
  3. Facilitates the removal of casting

Which of the above are true?

a. only i                                     b. i & ii                                 c. i & iii                      d. ii & iii

(Ans:c)

 

In permanent moulds, castings are capable of maintaining clearance of the order of

  1. 0.02 to 0.1mm
  2. b. 0.06 to 0.3mm
  3. c. 0.1 to 0.8mm
  4. d. 1 to 3mm

(Ans:b)

 

Which of the following is not true for permanent mould casting?

  1. They are superior in hardness
  2. can be used for pressure tight vessel (upto 15 Kgf/cm2)
  3. can be used for large size castings
  4. not suitable for alloys of high temperature

(Ans:c)

 

In semi permanent mould casting

  1. metallic core is used
  2. sand core is used
  3. wooden core is used
  4. no core is used

(Ans:b)

 

In slush casting

  1. metallic core is used
  2. sand core is used
  3. wooden core is used
  4. no core is used

(Ans:d)

 

In which of the following types of castings, the molten metal is allowed to solidify upto the required thickness?

  1. Permanent mould casting
  2. Semi permanent mould casting
  3. Slush casting
  4. Die casting

(Ans:c)

 

Ornaments, toys and statue of low melting alloys are made by which of the following method?

  1. Permanent mould casting
  2. b. Semi permanent mould casting
  3. Slush casting
  4. Die casting

(Ans:c)

 

In which of the following methods, close fitting cores are pushed in the cavities?

  1. Permanent mould casting
  2. b. Semi permanent mould casting
  3. Slush casting
  4. Pressed casting

(Ans:d)

 

In hot chamber die casting machine

  1. melting unit is an integral part of machine
  2. It is used for high melting (above 500°C) alloys
  3. No pressure is used for forcing the metal inside the die
  4. None of the above

(Ans:a)

 

In cold chamber die casting machine

  1. melting unit is an integral part of machine
  2. melting chamber is an external part of machine
  3. melting chamber can be placed anywhere
  4. low pressure is required to force the molten metal into the die casting

(Ans:b)