Top 150+ Solved Foundry Technology MCQ Questions Answer
Q. Carbondioxide moulding is useful for
a. very thin sections
b. regular sections
c. heavy and thick walled sections
d. all of the above
Q. A drawback is employed when
a. the pattern is too bulky
b. the pattern is too long
c. the pattern is not made of wood
d. the pattern cannot be drawn from mould due to projection
Q. In furan moulding which of the following is used as a catalyst?
a. Potassium hydroxide
b. Phosphoric acid
c. Ammonium hydroxide
d. Phenol formaldehyde
Q. Polystyrene is generally available in the form of
a. trapezoidal moulds
b. square sections
c. plates
d. cylindrical bars
Q. If an old casting is to be used as a pattern, to account for various allowances.
a. to provide draw screws, holes can be drilled and tapped in the castings
b. the castings are cleaned and made smooth
c. casting is shaken while withdrawing from mould
d. the surfaces are lagged with thin strips of wood or leater
Q. The strength of the sand is high if grains are
a. round and small
b. sharp and irregular in shape
c. large and regular in shape
d. none of the above
Q. A mould which has good erosion resistance to metal flow and is also collapsible is
a. green sand mould
b. skin dry sand mould
c. dry sand mould
d. none of the above
Q. During the passage of molten metal through the coke, the carbon percentage of the molten metal increases. The absorption of carbon depends on
a. size of the coke
b. temperature
c. time allowed for molten metal to remain in the cupola
d. all of the above
Q. Hot spots are generally found in castings
a. symmetrical about two axes
b. having abrupt variation in section
c. with uniform cross-section
d. small in weight but large in volume
Q. Which of the following metals has the lowest melting point?
a. Tin
b. Silver
c. Zinc
d. Magnesium
Q. In small castings which of the following allowance can be ignored?
a. Machining allowance
b. Rapping allowance
c. Draft allowance
d. Shrinkage allowance
Q. The design of gate should be such as to
a. avoid erosion of cores and mould cavity
b. prevent scum, slag and eroded sand particles from entering the mould cavity
c. minimize turbulence and dross formation
d. all of the above
Q. Mixing coal dust with moulding sand results in
a. blackening of the mould
b. strong mould
c. good air venting
d. none of the above