Multiple Choice Questions (MCQ) on Casting
In permanent mould casting, the moulds are usually coated with a refractory wash and then lamp black to
- Reduce chilling effect
- To prevent shrinkage
- 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
- 0.02 to 0.1mm
- b. 0.06 to 0.3mm
- c. 0.1 to 0.8mm
- d. 1 to 3mm
(Ans:b)
Which of the following is not true for permanent mould casting?
- They are superior in hardness
- can be used for pressure tight vessel (upto 15 Kgf/cm2)
- can be used for large size castings
- not suitable for alloys of high temperature
(Ans:c)
In semi permanent mould casting
- metallic core is used
- sand core is used
- wooden core is used
- no core is used
(Ans:b)
In slush casting
- metallic core is used
- sand core is used
- wooden core is used
- 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?
- Permanent mould casting
- Semi permanent mould casting
- Slush casting
- Die casting
(Ans:c)
Ornaments, toys and statue of low melting alloys are made by which of the following method?
- Permanent mould casting
- b. Semi permanent mould casting
- Slush casting
- Die casting
(Ans:c)
In which of the following methods, close fitting cores are pushed in the cavities?
- Permanent mould casting
- b. Semi permanent mould casting
- Slush casting
- Pressed casting
(Ans:d)
In hot chamber die casting machine
- melting unit is an integral part of machine
- It is used for high melting (above 500°C) alloys
- No pressure is used for forcing the metal inside the die
- None of the above
(Ans:a)
In cold chamber die casting machine
- melting unit is an integral part of machine
- melting chamber is an external part of machine
- melting chamber can be placed anywhere
- low pressure is required to force the molten metal into the die casting
(Ans:b)