Engineering :: Foundry Technology
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1. |
Electric furnaces can usually operate upto a temperature of |
Answer: Option C
Explanation:
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2. |
Generally for the melting of cast iron, electric furnaces are not used because |
A. |
cast iron is in the form of broken pieces |
B. |
cast iron requires higher temperature for heating |
C. |
the rate of heating required for melting cast iron connot be provided by electric furnaces |
D. |
It is expensive to use electricity for melting of cast iron |
Answer: Option D
Explanation:
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3. |
Electric indirect are furnace is normally used for melting of |
A. |
alloy steels |
B. |
cast steels |
C. |
non-ferrous metals |
D. |
all of the above |
Answer: Option C
Explanation:
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4. |
Pit furnace can be used for the melting of |
A. |
cast iron |
B. |
aluminium |
C. |
brass |
D. |
any of the above |
Answer: Option D
Explanation:
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5. |
Oil fired furnaces are generally used for the melting of |
A. |
cast steel |
B. |
alloy steel |
C. |
cast iron |
D. |
non-ferrous metals |
Answer: Option D
Explanation:
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6. |
Flux used in cupola while melting cast iron is |
A. |
lime stone |
B. |
coke slurry |
C. |
molasses |
D. |
any of the above |
Answer: Option A
Explanation:
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7. |
When sulphur is to be removed from cast iron while melting the same in cupola, the flux used is |
A. |
molasses |
B. |
sodium carbonate with lime stone |
C. |
zinc sulphate with lime stone |
D. |
none of the above |
Answer: Option B
Explanation:
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8. |
In fluminium foundry, for removing dissolved hydrogen and the entrapped dross, the flux used is |
A. |
nitrogen |
B. |
helium |
C. |
chlorine |
D. |
any of the above |
Answer: Option D
Explanation:
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9. |
In melting of aluminium, the dross consists of |
A. |
oxides of aluminium, magnesium etc. |
B. |
sand and dust |
C. |
lighter material |
D. |
none of the above |
Answer: Option A
Explanation:
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10. |
Use of flux in melting of magnesium |
A. |
separates out impurities |
B. |
prevents burning of magnesium alloys |
C. |
facilitates production of sound cstings |
D. |
all of the above |
Answer: Option D
Explanation:
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