Top 150+ Solved Foundry Technology MCQ Questions Answer
Q. The defect known as 'drop' occurs when the upper surface of the mould cracks and pieces of sand fall into the molten metal. This defect occurs due to
a. low mould hardness
b. insufficient reinforcement
c. low green strength
d. any of the above
Q. Investment casting finds application in all of the following EXCEPT
a. Jet engine nozzles
c. Milling cutters
d. Buckets for superchargers
e. Gold ornaments
Q. Lowest pouring temperature alloy is
a. Phosphor bronze
b. Cupro nickel alloy
c. Monel metal
d. Tin bronze
Q. The residual stresses in casting occur due to
a. sand particles being taken into molten metal while pouring
b. the insufficient gate size
c. the differential solidification rate of thin and thick sections of casting
d. none of the above
Q. Local stress relief treatments are generally given to
a. small castings
c. non-ferrous castings
d. all castings
e. too large castings
Q. Which of the following is used on moulds for magnesium castings to prevent metal mould reactions?
a. Boric sulphur
b. Molasses
c. Charcoal
d. all of the above
Q. Silica is the second most important constituent of moulding sand which provides
a. binding strength
b. refractoriness
c. chemical resistance
d. none of the above
Q. Flash occurs on diecastings at the
b. gatting system
c. ejection pins
d. vents between the dies
e. parting surface of two dies
Q. The methods of casting for producing ornamental pieces are
a. pressed and slush casting
b. slush and gravity casting
c. gravity and semi permanent mould casting
d. none of the above
Q. High pouring rate leads to
a. mould erosion
b. rough surface
c. excessive shrinkage
d. any of the above
Q. The most suitable metals for die casting are
a. zinc and its alloys
b. copper and its alloys
c. aluminium and its alloys
d. none of the above
Q. Sand is broadly specified by
a. grain size
b. colour
c. moisture content
d. all of the above together