Engineering :: Foundry Technology

1.  Electric furnaces can usually operate upto a temperature of
A. 1000?C B. 1250?C
C. 1700?C D. 2200?C

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

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

4.  Pit furnace can be used for the melting of
A. cast iron B. aluminium
C. brass D. any of the above

5.  Oil fired furnaces are generally used for the melting of
A. cast steel B. alloy steel
C. cast iron D. non-ferrous metals

6.  Flux used in cupola while melting cast iron is
A. lime stone B. coke slurry
C. molasses D. any of the above

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

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

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

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

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