Foundry Metallurgy MCQ Questions and Answers

21

What is the length of the flakes in gray cast iron?

A) 0.5 - 1 mm B) 0.05 - 0.1 mm C) 0.1 - 1.0 mm D) 0.15 - 0.2 mm

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Answer & Solution

Answer: Option B

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22

Loam sand contains . . . . . . . . of moisture

A) 18% B) 25% C) 10% D) 5%

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Answer & Solution

Answer: Option A

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23

The riser is designed such that the melt in the riser solidifies

A) Before casting solidifies B) At the same time as casting solidifies C) After casting solidifies D) Irrespective of the solidification of the casting

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Answer & Solution

Answer: Option C

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24

What is the solidification temperature of malleable cast iron?

A) 1129° - 1398°C B) 1093° - 1315°C C) 1350° - 1500°C D) 850° - 1150°C

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Answer & Solution

Answer: Option A

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25

Match the defect with appropriate cause.

List-I	List-II
P. Hot tear	1. Inadequate riser
Q. Porosity	2. Loosely rammed sand mould
R. Sand inclusions	3. Mould restraint
S. Shrinkage cavity	4. Gas entrapment

A) P-3, Q-2, R-4, S-1 B) P-3, Q-2, R-1, S-4 C) P-1, Q-4, R-2, S-3 D) P-4, Q-3, R-2, S-1

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Answer & Solution

Answer: Option A

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26

When the cooling rate during solidification process is very slow then the growth of nuclei takes place by

A) Smooth interfacial growth B) Dendritic growth C) Both A and B D) None of these

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Answer & Solution

Answer: Option A

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27

Match the features observed in castings listed in Group I with the most appropriate reasons listed in Group II.

Group I	Group II
P. Macrosegregation	1. Inoculation
Q. Fine grained structure	2. Gas evolution and shrinkage
R. Porosity	3. Temperature gradients and supercooling
S. dendrites	4. Density difference and convection currents

A) P-1, Q-3, R-2, S-4 B) P-4, Q-1, R-2, S-3 C) P-2, Q-4, R-1, S-3 D) P-4, Q-1, R-3, S-2

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Answer & Solution

Answer: Option B

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28

Casting alloys with a large freezing range tend to result in
P. shrinkage cavity
Q. distributed shrinkage porosity
R. liquid metal with poorer fluidity
S. liquid metal with superior fluidity

A) P, R B) Q, R C) P, S D) Q, S

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Answer & Solution

Answer: Option C

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29

Mould coating material which helps in grain refinement of metal casting is

A) cobalt aluminide B) zinc C) tellurium D) boron

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Answer & Solution

Answer: Option A

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30

Mould oscillation is used in continuous casting of steels to

A) heal cracks formed on the surface of the casting B) obtain good mixing of the liquid metal inside the mould C) float out the inclusions D) avoid rhomboidity of the casting

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Answer & Solution

Answer: Option D

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Foundry Metallurgy MCQ Questions and Answers | Metallurgical Engineering